390 research outputs found
Bazboltonia microps Camacho & Feitosa 2022, comb. nov.
No full text<i>Bazboltonia microps</i> (Borgmeier 1957) comb. nov. <p> <i>Heteroponera microps</i> Borgmeier, 1957: 112, figs. 23–26 (worker), BRAZIL.</p> <p> Combination in <i>Boltonia</i>: Camacho & Feitosa, 2022: 14.</p>Published as part of <i>Camacho, Gabriela P. & Feitosa, Rodrigo M., 2022, Bazboltonia nom. nov., a replacement name for the preoccupied Neotropical ant genus Boltonia Camacho & Feitosa 2022 (Hymenoptera: Formicidae), pp. 449-450 in Zootaxa 5116 (3)</i> on page 450, DOI: 10.11646/zootaxa.5116.3.9, <a href="http://zenodo.org/record/6372278">http://zenodo.org/record/6372278</a>
Bazboltonia nom. nov., a replacement name for the preoccupied Neotropical ant genus Boltonia Camacho & Feitosa 2022 (Hymenoptera: Formicidae)
No full textCamacho, Gabriela P., Feitosa, Rodrigo M. (2022): Bazboltonia nom. nov., a replacement name for the preoccupied Neotropical ant genus Boltonia Camacho & Feitosa 2022 (Hymenoptera: Formicidae). Zootaxa 5116 (3): 449-450, DOI: https://doi.org/10.11646/zootaxa.5116.3.
Bazboltonia Camacho & Feitosa, 2022, nom. nov.
No full text<i>Bazboltonia</i> nom. nov. <p> <i>Boltonia</i> Camacho & Feitosa, 2022: 14 (Insecta, Hymenoptera). Preoccupied by † <i>Boltonia</i> Pruvost, 1919 (Insecta, Orthoptera)</p> <p> <b>Type-species</b>: <i>Heteroponera microps</i> Borgmeier 1957, by original designation.</p> <p> <b>Etymology</b>. Following the original proposal in Camacho <i>et al</i>. (2022), the genus name is proposed in honor of the legendary ant taxonomist Barry Bolton, whose lifelong nickname is ‘Baz <i>’</i>.</p>Published as part of <i>Camacho, Gabriela P. & Feitosa, Rodrigo M., 2022, Bazboltonia nom. nov., a replacement name for the preoccupied Neotropical ant genus Boltonia Camacho & Feitosa 2022 (Hymenoptera: Formicidae), pp. 449-450 in Zootaxa 5116 (3)</i> on page 449, DOI: 10.11646/zootaxa.5116.3.9, <a href="http://zenodo.org/record/6372278">http://zenodo.org/record/6372278</a>
Lachnomyrmex amazonicus Feitosa & Brandao, new species
No full text<i>Lachnomyrmex amazonicus</i> Feitosa & Brandão, new species <p>Figures 2, 20</p> <p> <b>Holotype worker. BRAZIL: Pará</b>: Parauapebas, Fl. Nacional de Carajás, Garagem, 06º02'54''S 50º04'55''W, 25.iv–02.v.2008, Rogério R. Silva col., no. 5 [MZSP].</p> <p> <b>Paratypes.</b> same data as holotype, no. 1 (1 worker) [CASC]; same data, no. 4 (1 worker) [CPDC]; same data (1 worker) [ICNC]; same data, no. 5 (1 worker) [USNM]; same data (1 worker) [WMPC]; same data, nos. 1/2/3/4/5 (5 workers and 3 gynes) [MZSP]; <b>BRAZIL: Amazonas</b>: Manaus, 22.ix.1993, A.B. Casimiro col., no. 4829 (1 worker) [INPA]; iii-iv.1994, R. Didham col. (3 workers) [BMNH]; same data (1 worker) [MZSP]; <b>Mato Grosso</b>: Alta Floresta, 10º47'S 56º49'W, 28.iv.1999, H.L. Vasconcelos col. (1 worker) [INPA]; <b>Pará</b>: Melgaço, Caxiuanã, 1º44'9''S 51º29'15"W, 27–29.i.2003, A.Y. Harada, E.P. Fagundes, P. Batra, R. Calisto & Mó cols, no. 5 [MPEG]; 1º45'15''S 51º31'20"W, 23–25.i.2004, A.Y. Harada, E. P. Fagundes, R. Calisto & Mó cols, no. 5 (1 worker) [MZSP]; Parauapebas, Fl. Nacional de Carajás, Casa de Hóspedes, 06º03'41''S 50º03'13''W, 25.iv–02.v.2008, Rogério R. Silva col., no. 1 (1 worker) [MZSP]; Núcleo Urbano, 06º03'53''S 50º03'42''W, 25.iv–02.v.2008, Rogério R. Silva col., no. 1 (1 worker) [MZSP]; Zoobotânico, 06º03'41''S 50º03'13''W, 25.iv–02.v.2008, Rogério R. Silva col., no. 1 (1 worker) [MZSP].</p> <p> <b>Worker diagnosis.</b> Body irregularly rugose; promesonotum in profile elevated well above the level of propodeum; metanotal groove weakly impressed to obsolete; propodeal spines slightly directed upwards; teeth of propodeal lobes reduced; dorsum of postpetiole with more than 10 long, flexuous hairs; first gastral tergite entirely devoid of long hairs.</p> <p> <b>Holotype measurements.</b> HL 0.58; HW 0.58; ML 0.16; SL 0.31; EL 0.11; WL 0.66; PSL 0.14; PL 0.28; PPL 0.13; GL 0.76; TL 2.57; CI 100; SI 54; OI 18.</p> <p> <b>Worker measurements</b> (n=6). HL 0.52–0.66; HW 0.54–0.66; ML 0.16–0.21; SL 0.31–0.41; EL 0.08– 0.13; WL 0.57–0.74; PSL 0.11–0.17; PL 0.22–0.29; PPL 0.12–0.15; GL 0.68–0.82; TL 2.26–2.84; CI 100– 103; SI 50–63; OI 13–19.</p> <p> <b>Worker description.</b> Color dark reddish-brown to blackish, with waist and gaster slightly lighter; appendages yellowish to light brown. Body densely covered by vermiculate short rugae, forming irregular areolae on promesonotum; rugae somewhat longer and longitudinal on head dorsum, and slightly sparser on mesopleura and lateral surfaces of propodeum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and mesosoma dorsum; dorsum of petiolar node and postpetiole each with more than 10 long, flexuous hairs; first gastral tergite entirely devoid of long hairs.</p> <p>Head as long as broad, with vertexal margin weakly convex; frontal lobes laterally rounded; eyes with about seven facets on maximum diameter. Promesonotum strongly convex in profile, elevated well above the level of propodeum; metanotal groove shallow to virtually obsolete; propodeal spines slightly directed upwards; teeth of propodeal lobes reduced, with around one-third of propodeal spines length. Petiolar node moderately elevated, dorsally rounded, and with the posterior face weakly sloped in lateral view; postpetiole feebly convex dorsally and without ventral processes.</p> <p> <b>Gyne.</b> Differing from worker by the larger eyes, with around 14 facets at maximum diameter; propodeal spines straight, without the apexes curved upwards.</p> <p> <b>Etymology.</b> The name refers to the region from where this species is known, the Amazon Basin.</p> <p> <b>Comments.</b> The general habitus of this species allies it with <i>Lachnomyrmex longinoi</i>, <i>L. nordestinus</i>, <i>L. plaumanni</i>, and <i>L. victori</i>. These species share the irregular body sculpturation, the obsolete metanotal groove, and the absence of long hairs on the first tergite of gaster. However, <i>L. amazonicus</i> can be distinguished from these species by the combination of promesonotum strongly convex, propodeal spines directed upwards, and dorsum of postpetiole bearing more than 10 long hairs.</p> <p> <i>Lachnomyrmex amazonicus</i> is known from Amazonian Brazil, in 60–200m elevation rainforest. It is one of the few species in the genus occurring in lowland forests rather than in submontane localities. All records refer to workers obtained in samples of sifted litter from the forest floor.</p>Published as part of <i>Feitosa, Rodrigo M. & Brandão, Carlos Roberto F., 2008, A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae), pp. 1-49 in Zootaxa 1890</i> on pages 11-13, DOI: <a href="http://zenodo.org/record/184304">10.5281/zenodo.184304</a>
Lachnomyrmex regularis Feitosa & Brandao, new species
No full text<i>Lachnomyrmex regularis</i> Feitosa & Brandão, new species <p>Figures 15, 19</p> <p> <b>Holotype worker. COSTA RICA</b>: <b>Guanacaste</b>: Estr. Pitilla, 9km S Sta. Cecília, 11º04'N 85º24'O, 6– 19.viii.1993, P. Ríos col., no. INBIOCRI001613693 [INBC].</p> <p> <b>Paratypes.</b> same data as holotype; no. INBIOCRI001613661 (1 worker) [BMNH]; same data, nos. INBIOCRI001613662/INBIOCRI001613666/INBIOCRI001613673/INBIOCRI001613676 (4 workers) [INBC]; same data, nos. INBIOCRI001613677/INBIOCRI001613681 (2 workers) [MZSP].</p> <p> <b>Worker diagnosis.</b> Body densely covered by fine and continuous rugae; eyes well developed, with about 10 facets at maximum diameter; dorsum of postpetiole entirely smooth and shining, bearing around four long hairs; gaster distinctly darker than body and with the first tergite completely devoid of long flexuous hairs.</p> <p> <b>Holotype measurements.</b> HL 0.84; HW 0.79; ML 0.29; SL 0.55; EL 0.20; WL 0.98; PSL 0.30; PL 0.39; PPL 0.20; GL 1.02; TL 3.73; CI 93; SI 70; OI 26.</p> <p> <b>Worker measurements</b> (n=7). HL 0.82–0.90; HW 0.76–0.83; ML 0.25–0.31; SL 0.53–0.58; EL 0.19– 0.22; WL 0.98–1.09; PSL 0.27–0.31; PL 0.38–0.47; PPL 0.17–0.24; GL 0.96–1.10; TL 3.57–4.11; CI 91–93; SI 69–71; OI 25–28.</p> <p> <b>Worker description.</b> Color light reddish-brown to dark brown, contrasting with blackish gaster; appendages slightly lighter than body. Head and mesosoma densely covered by continuous, fine rugae, transverse on anterior portion of pronotum, grading to longitudinal on rest of promesonotum, mesopleura, and propodeum; rugae on cephalic dorsum subparallel and exceptionally dense, leaving no spaces among them; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole only feebly rugose on lateral faces. Abundant pilosity on head and dorsum of promesonotum; dorsum of petiolar node and postpetiole with about six and four long hairs, respectively; first tergite of gaster entirely devoid of long flexuous hairs.</p> <p>Head noticeable longer than broad, with vertexal margin weakly convex; frontal lobes somewhat angulate laterally; eyes relatively large, with around 10 facets at greatest diameter. Promesonotum considerably convex in profile, well above propodeum level; metanotal groove relatively narrow and markedly impressed; propodeal spines straight and relatively long; teeth of propodeal lobes widen basally, with about one-third of propodeal spines length. Petiolar node strongly elevated and subtriangular in lateral view; dorsum of postpetiole with a raised prominence medially and a well developed anteroventral projection directed anteriorly.</p> <p> <b>Gyne.</b> Unknown.</p> <p> <b>Etymology.</b> This species is named after its regular pattern of body sculpturation in comparison with other <i>Lachnomyrmex</i> species. From Latin, <i>regularis</i>: regular.</p> <p> <b>Comments.</b> The sculpturation pattern and the presence of a subpostpetiolar projection are similar to <i>L. haskinsi</i>. However, <i>L. regularis</i> is easily distinguishable by its larger body size, rugae on head dorsum distinctly denser, eyes more developed, postpetiole dorsum entirely smooth, and body color variably brown contrasting with darker gaster.</p> <p> The only collection of <i>L. regularis</i> so far was made in northern Costa Rica, at 700m elevation. There is no information on the biology of this species.</p>Published as part of <i>Feitosa, Rodrigo M. & Brandão, Carlos Roberto F., 2008, A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae), pp. 1-49 in Zootaxa 1890</i> on pages 38-40, DOI: <a href="http://zenodo.org/record/184304">10.5281/zenodo.184304</a>
Lachnomyrmex mackayi Feitosa & Brandao, new species
No full text<i>Lachnomyrmex mackayi</i> Feitosa & Brandão, new species <p>Figures 10, 19</p> <p> <b>Holotype worker. PANAMA: Chiriqui</b>: Bocas del Toro, Cont. Div., 9.vi.1995, R. Anderson col., no. 17840, specimen code CASENT0173883 [MCZC].</p> <p> <b>Paratypes. PANAMA: Chiriqui</b>: 20.4km N. San Félix, 8.vi.1995, R. Anderson col., no. 17767 (1 worker) [WPMC].</p> <p> <b>Worker diagnosis.</b> Body covered by continuous vermiculate rugae; in lateral view, petiolar node considerably elevated and subtriangular; dorsum of postpetiole with more than 10 long hairs; subpostpetiolar process moderately developed; first tergite of gaster with of long flexuous hairs restricted to the anterior third.</p> <p> <b>Holotype measurements.</b> HL 0.68; HW 0.65; ML 0.22; SL 0.44; EL 0.17; WL 0.79; PSL 0.18; PL 0.31; PPL 0.17; GL 0.88; TL 3.06; CI 95; SI 68; OI 26.</p> <p> <b>Worker measurements</b> (n=1). HL 0.61; HW 0.60; ML 0.20; SL 0.39; EL 0.14; WL 0.72; PSL 0.16; PL 0.27; PPL 0.14; GL 0.74; TL 2.69; CI 97; SI 66; OI 24.</p> <p> <b>Worker description.</b> Color light reddish-brown, with yellowish appendages. Head and mesosoma finely covered by continuous, vermiculate rugae, transverse on anterior portion of pronotum, grading to longitudinal on rest of promesonotum, mesopleura and lateral surfaces of propodeum; mandibles with few and short longitudinal striae restricted to basal portion; petiole and postpetiole irregularly rugose. Abundant pilosity on head and dorsum of promesonotum; petiolar node with about six long hairs; dorsum of postpetiole with more than 10 long hairs; first tergite of gaster with long flexuous hairs restricted to the most anterior portion, near the insertion of postpetiole.</p> <p>Head slightly longer than broad, with vertexal margin only moderately convex; frontal lobes weakly rounded laterally; eyes comparatively large, with approximately eight facets at greatest diameter. Promesonotum gently convex in profile; metanotal groove relatively narrow and deeply impressed; propodeal spines mostly straight, with apexes minimally directed upwards; teeth of propodeal lobes swollen basally, with about half-length of propodeal spines. Petiolar node elevated and subtriangular in dorsal view; dorsum of postpetiole strongly convex and with a discrete anteroventral projection, directed anteriorly.</p> <p> <b>Gyne.</b> Unknown.</p> <p> <b>Etymology.</b> This species is named after Dr. William “Bill” Mackay, myrmecologist at the University of Texas, El Paso. Mackay sent us important material for this study, including the type series of this species.</p> <p> <b>Comments.</b> The absence of a median prominence on the dorsum of postpetiole and the presence of long flexuous hairs on the first tergite of gaster separate this species from the related <i>Lachnomyrmex haskinsi</i> and <i>L. regularis</i>. In addition, the cited species bear less than 10 long hairs on the postpetiole dorsum. <i>Lachnomyrmex mackayi</i> is also similar to <i>L. fernandezi</i>; however, the latter has the petiolar node rounded dorsally and the long flexuous hairs covering the entire surface of the first gastral tergite.</p> <p>The only two collections of this species so far were extracted from the leaf litter of wet montane forests of Panama.</p>Published as part of <i>Feitosa, Rodrigo M. & Brandão, Carlos Roberto F., 2008, A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae), pp. 1-49 in Zootaxa 1890</i> on page 27, DOI: <a href="http://zenodo.org/record/184304">10.5281/zenodo.184304</a>
Lachnomyrmex nordestinus Feitosa & Brandao, new species
No full textLachnomyrmex nordestinus Feitosa & Brandão, new species Figures 11, 18 Holotype worker. BRAZIL: Paraíba: João Pessoa, Mata do Buraquinho, 07º08' 24 ''S 34 º 51 ' 33 ''W, 25.vii. 2002, R.R. Silva & F. Eberhardt cols, no. 5 [MZSP]. Paratypes. same data as holotype (1 worker) [MZSP]; BRAZIL: Ceará: Maranguape, viii. 2003, Y. Quinet col., no. 80 (2 workers) [UFCE]; same data (1 worker) [MZSP]; Pernambuco: Jaqueira, Usina Colônia, M. do Espelho, 30.vii. 2003, A. Bieber & I. Leal cols, no. P.05 (1 gyne) [UFPE]; Recife, Horto Dois Irmãos, 08º00' 32 ''S 34 º 56 ' 40 ''W, 15–24.vii. 2002, R.R. Silva & F. Eberhardt cols, nos. 2 / 7 / 13 / 28 / 32 / 34 / 36 / 38 (7 workers and 1 gyne) [MZSP]; same data, no. 32 (1 worker) [AMNH]; same data, no. 33 (1 worker) [BMNH]; same data, no. 34 (1 worker) [CASC]; same data, no. 36 (1 worker) [CPDC]; same data, no. 38 (1 worker) [ICNC]; Sergipe: Areia Branca, P. E. da Serra de Itabaiana, 10 º 45 ' 54 ''S 37 º 19 ' 57 ''W, 19–25.v. 2003, R.R. Silva, B.H. Dietz & L.S. Ferreira cols, nos. 10 / 17 / 26 / 30 / 46 / 47 (6 workers and 2 gynes) [MZSP]; same data, no. 38 (1 worker) [MIZA]; same data, no. 46 (1 worker) [USNM]; same data, no. 46 (1 worker) [WPMC]. Worker diagnosis. Promesonotum strongly convex and elevated well above the level of propodeum, in profile; metanotal groove obsolete; apex of propodeal spines slightly curved upwards; teeth of propodeal lobes reduced; dorsum of postpetiole with around six long hairs; first gastral tergite entirely devoid of long flexuous hairs. Holotype measurements. HL 0.65; HW 0.65; ML 0.22; SL 0.38; EL 0.13; WL 0.72; PSL 0.19; PL 0.31; PPL 0.13; GL 0.80; TL 2.84; CI 100; SI 59; OI 19. Worker measurements (n= 16). HL 0.63–0.74; HW 0.61–0.72; ML 0.20–0.24; SL 0.37–0.46; EL 0.12– 0.14; WL 0.68–0.80; PSL 0.15–0.24; PL 0.30–0.36; PPL 0.11–0.14; GL 0.77–0.93; TL 2.71–3.18; CI 96–100; SI 59–67; OI 19–22. Gyne measurements (n= 3). HL 0.71; HW 0.69–0.71; ML 0.21–0.24; SL 0.44–0.46; EL 0.18–0.19; WL 0.90–0.94; PSL 0.19–0.20; PL 0.33–0.38; PPL 0.15–0.16; GL 0.93–0.98; TL 3.27–3.40; CI 98–100; SI 62– 66; OI 25–26. Worker description. Color light brown to blackish, contrasting with yellowish appendages and gaster. Body densely covered by vermiculate short rugae, forming irregular areolae on promesonotum dorsum; rugae somewhat longer and longitudinal on head dorsum, and slightly sparser on mesopleura and lateral surfaces of propodeum; mandibles with short longitudinal striae restricted to basal portion; petiole and postpetiole finely and irregularly rugose. Abundant pilosity on head and promesonotum dorsum; dorsum of petiolar node and postpetiole with around 10 and six long flexuous hairs, respectively; first gastral tergite entirely devoid of long hairs. Head as long as broad to slightly longer than broad, with vertexal margin only minimally convex; frontal lobes laterally rounded; eyes with about six facets on maximum diameter. Promesonotum strongly convex in profile, elevated well above the level of propodeum; metanotal groove virtually obsolete; propodeal spines well developed and slightly directed upwards; teeth of propodeal lobes reduced, with approximately one-third of propodeal spines length. Petiolar node moderately elevated and rounded dorsally, with the posterior face weakly sloped in lateral view; postpetiole gently convex dorsally and without ventral processes. Gyne. Differing from the conspecific worker by the larger size of eyes, with about 15 facets at maximum diameter; propodeal spines comparatively shorter and straight apically; petiolar node only feebly elevated; ad dorsum of postpetiole with more than 10 long flexuous hairs. Etymology. The epithet nordestinus refers to the northeastern Brazil (from Portuguese: Nordeste), the geographical region where this species occurs. Comments. This species is very similar to Lachnomyrmex amazonicus and L. victori, but can be readily distinguished mainly by the scarcer pilosity on postpetiole dorsum. Gynes of L. nordestinus can be separated from L. victori by the absence of long flexuous hairs on the dorsum of the first gastral tergite. All specimens known for L. nordestinus were collected in the leaf litter of the northeastern Brazilian Atlantic Forest (100–800m). This biome is seriously threatened by human activity, especially in this region.Published as part of Feitosa, Rodrigo M. & Brandão, Carlos Roberto F., 2008, A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae), pp. 1-49 in Zootaxa 1890 on pages 29-30, DOI: 10.5281/zenodo.18430
FIGURE 14 in Additions to the taxonomy of Gnamptogenys Roger (Hymenoptera: Formicidae Ectatomminae) with an updated key to the New World species
No full textFIGURE 14. Frontal view of head, showing: A) scape smooth and shiny (G. rastrata—CASENT0281223); and B) scape with sparse sculpture (G. haenschi—CASENT0179994). Photos by Estella Ortega (A) and Erin Prado (B) available from www. antweb.org.Published as part of Camacho, Gabriela P., Franco, Weslly & Feitosa, Rodrigo M., 2020, Additions to the taxonomy of Gnamptogenys Roger (Hymenoptera: Formicidae Ectatomminae) with an updated key to the New World species, pp. 450-476 in Zootaxa 4747 (3) on page 461, DOI: 10.11646/zootaxa.4747.3.2, http://zenodo.org/record/369631
Gnamptogenys avus Camacho & Franco & Feitosa 2020, new species
No full text<p> <i>Gnamptogenys avus</i> <b>new species</b></p> <p>(Figure 16)</p> <p> <b>Holotype</b>: <b>GUYANA:</b> Mt. Ayanganna cloud forest, 1300 m, 5°22.483’N, 59°57.969’W, 13.x.2002, litter sample, T. Schultz, J. LaPolla, C. Marshall, R. Williams col. (1 worker) [CSBD—USNM00413910].</p> <p> <b>Paratype: GUYANA</b>: Mt. Ayanganna Falls Camp, 1134 m, 5°22.332’N, 59°57.563’W, 11.x.2002, 1° forest, litter sample, T. Schultz, J. LaPolla, C. Marshall, R. Williams col. (1 worker) [NMNH—USNM00413360].</p> <p> <b>Diagnosis:</b> Size comparatively small (TL 2.57−2.75). Mandible smooth and shiny on their dorsal face. Small eyes, with five ommatidia on their largest diameter (Fig. 16A). Scape surpassing vertex margin at least by the same length as its apical width. Dorsal profile of mesosoma flat, metanotal impression absent. Propodeal spiracle positioned at the propodeum lateral margins, turned posteriorly and forming a tubuliform projection, its opening above the level of integument. Propodeum without any lobes, in lateral view (Fig. 16C). Metacoxal spine present. Segments I and II of gaster completely costulate (Fig. 16B).</p> <p> <b>Description</b></p> <p>Worker: HL 0.60–0.62; HW 0.47–0.50; ML 0.24–0.27; SL 0.45–0.50; EL 0.1–0.08; WL 0.91–0.83; PL 0.25– 0.23; GL 0.84–0.80; TL 2.57–2.75; CI 78.33–80.64; SI 95.74−100; OI 21.27−16 (n=2). Small size. Brown-coppery color, with appendages and gaster the same color. Body predominantly covered by thin, long, suberect hairs. Mandible smooth and shiny, without rugulae or striations on the dorsal surface. Head dorsum covered by long longitudinal costulae, deep and slightly irregular, semiparallel from the anterior margin of clypeus to vertex margin; vertex smooth and shiny, without hairs; surface of costulae covered by punctuation, giving them a rough appearance; intervals between costulae smooth and shiny. Mesosoma completely covered by wide costulae, approximately 0.035 mm in width, with straight margins on the dorsal surface; pronotum with transverse costulae anteriorly and several subparallel costulae on the dorsal surface. Declivitous face of propodeum covered by costulae, the same width and appearance as on mesosoma. Petiole with same sculpture as mesosoma. Coxae always covered by transverse costulae, narrower than on mesosoma. Segments I and II of gaster with same sculpture as mesosoma. Anterior face of first gastral segment bare, smooth with sparse rugulae.</p> <p>Mandible triangular.Anterior margin of clypeus strongly convex in frontal view. Lateral margins of head straight and subparallel, slightly tapered anteriorly. Occipital corners extend ventrally, forming a small ridge. Antennal scape narrow, almost twice as wide apically than at its base; scape surpassing the vertex margin by the length of the apical width of scape. Eyes with at least five ommatidia, located slightly behind the anterior half of the head in frontal view. Vertex margin straight.</p> <p>Dorsal profile of mesosoma compact and flat in lateral view, without mesonotal impression. Lateral margins of declivitous face of propodeum parallel; dorsal and declivitous face of propodeum differentiated, forming a light ridge between the two; propodeal spiracle positioned at the propodeum lateral margins, turned posteriorly and forming a tubuliform projection, its opening above the level of integument. Propodeum without lobes or projections. Metacoxal spine acute and relatively large.</p> <p>Anterior and posterior margins of petiole subparallel in lateral view; petiole not pedunculated. Subpetiolar process predominantly opaque and subquadrate, very large, occupying more than half of the ventral surface of the petiole; subpetiolar process with a fenestra positioned centrally. Prora large and visible in lateral view.</p> <p> <b>Etymology:</b> From Latin <i>avus</i> =ancestor/grandfather, in reference to the species basal position within its clade, according to phylogenomic data. Fittingly, the name also honors the first author’s grandfather, whose love for nature was always a source of admiration and inspiration. The name is applied here as a noun in apposition.</p> <p> <b>Distribution:</b> <i>Gnamptogenys avus</i> is known only from the type locality, Mt. Ayanganna, Guyana (Fig. 17).</p> <p> <b>Natural History:</b> The specimens were collected in litter samples from primary montane forest, suggesting this species likely lives and/or forages in the leaflitter. <i>Gnamptogenys avus</i> is only found in this locality, which might indicate a preference for montane, preserved forest areas.</p> <p> <b>Comments:</b> <i>Gnamptogenys avus</i> is similar to <i>G</i>. <i>mina</i> (Brown). <i>Gnamptogenys avus</i> has compound eyes (only one ommatidium in <i>G. mina</i>), the scape surpasses the vertex margin (not reaching the vertex margin in <i>G. mina</i>), and the propodeal spiracle is protruding (less protruding in <i>G. mina</i>). Despite the morphological similarities between <i>G. mina</i> and <i>G. avus</i>, both species do not appear to be closely related, according to phylogenomic analysis of <i>Gnamptogenys</i> species relationships (Camacho <i>et al.</i>, in prep).</p>Published as part of <i>Camacho, Gabriela P., Franco, Weslly & Feitosa, Rodrigo M., 2020, Additions to the taxonomy of Gnamptogenys Roger (Hymenoptera: Formicidae Ectatomminae) with an updated key to the New World species, pp. 450-476 in Zootaxa 4747 (3)</i> on pages 462-465, DOI: 10.11646/zootaxa.4747.3.2, <a href="http://zenodo.org/record/3696314">http://zenodo.org/record/3696314</a>
Prionopelta minuta Ladino & Feitosa 2020, sp. n.
No full textPrionopelta minuta sp. n. Figures 23–24, 35C Holotype worker. BRAZIL: Rondônia: Itapuã do Oeste, Floresta Nacional do Jamari, -9.9780 -62.9780, 03- 10.iii.2016, A.C. Ferreira & L. Cunha cols., Winkler, DZUP549780 (1 specimen) [DZUP]. Paratype workers. s ame data as holotype, DZUP549781 (1 specimen) [DZUP]; DZUP549782 (1 specimen) [DZUP]; DZUP549783 (1 specimen) [DZUP]; DZUP549784 (1 specimen) [DZUP]; DZUP549785 (1 specimen) [DZUP]; DZUP5490786 [DZUP]; DZUP549787 (1 specimen) [DZUP]; DZUP549788 (1 specimen) [DZUP]; DZUP549789 (1 specimen) [DZUP]; DZUP549790 (3 specimens) [MCZ]; DZUP549791 (2 specimens) [USNM]; DZUP549792 (3 specimens) [MZSP]; DZUP549793 (2 specimens) [INPA]; DZUP549794 (2 specimens) [ICN]; DZUP549795 (1 specimen) [MPEG]. Diagnosis. Lateral portion of frons with foveolate sculpturing nearly confluent and inconspicuous shiny interspaces appearing as small raised margins. Twelve antennomeres. Posterior margin of subpetiolar process straight. Holotype measurements. HL 0.43; HW 0.37; SL 0.23; WL 0.51; PrL 0.22; PrW 0.25; PetNL 0.13; PetW 0.20; PetH 0.14; PetL 0.14; T1L 0.20; T1W 0.30; TL 1.28; CI 86; SI 62; PetI 153; PetHI 100; PetWI 142. Worker measurements (n=7). HL 0.42–0.48; HW 0.36–0.40; SL 0.22–0.24; WL 0.48–0.51; PrL 0.20–0.23; PrW 0.24–0.27; PetNL 0.11–0.14; PetW 0.16–0.21; PetH 0.12–0.16; PetL 0.12–0.14; T1L 0.18–0.22; T1W 0.28– 0.31; TL 1.24–1.32; CI 81–90; SI 55–63; PetI 114–175; PetHI 85–133; PetWI 114–175. Queen measurements (n=1). HL 0.53; HW 0.48; SL 0.27; WL 0.73; PrL 0.15; PrW 0.31; PetNL 0.13; PetW 0.28; PetH 0.19; PetL 0.19; T1L 0.25; T1W 0.46; TL 1.70; CI 90; SI 55–63; PetI 215; PetHI 100; PetWI 147. Worker description. Body light yellow. Integument covered by deep and dense foveolate sculpturing with inconspicuous shiny spaces between the fovea on the lateral portion of frons, appearing as small raised margins in full-face view. Pubescence abundant over the entire body. Head longer than broad; length of median tooth of mandible shorter than basal tooth; basal margins of mandibles slightly convex. Clypeus evenly rounded to slightly projecting medially. Twelve antennomeres; antennomeres 1–4 separated by deep constrictions. Eyes placed immediately posterior to the head midlength. Pronotum broader than long. Distance between the propodeal spiracles and the bulla of the metapleural gland corresponding to one spiracular diameter; distance between the propodeal spiracles and the propodeal dorsum corresponding to almost two spiracular diameters. Petiolar node as long as high. Subpetiolar process subtriangular, with anterior and posterior margins converging apically; posterior margin straight; posteroventral angle obtuse. Queen. Distance between the propodeal spiracles and the bulla of the metapleural gland corresponding to half spiracular diameter; distance between the propodeal spiracles and the propodeal dorsum equal to two spiracular diameters. Posteroventral angle of the subpetiolar process obtuse. Male. Unknown. Etymology. The name refers to the comparative small size of this species. From Latin, minuta = small. Distribution (Fig. 35C). Prionopelta minuta is known from southwestern Colombia and northern Brazil. Comments. This species can be confused with P. modesta since both have a dense foveolate sculpturing on the head dorsum and twelve antennomeres. Comparatively, P. modesta comprises larger ants, with interspaces between fovea of the lateral portion of frons moderately spaced and posterior margin of the subpetiolar process clearly concave. Prionopelta minuta groups smaller ants, with nearly confluent foveolate sculpturing and posterior margin of the subpetiolar process straighter. The last feature mentioned for P. minuta is useful to separate the species from other Neotropical members of the genus, as well as the body length of workers, always lesser than 1.40 mm. Most of the specimens known so far for P. minuta come from the Amazon rainforests of the Brazilian states of Rondônia and Amazonas. The transitional areas between these forests and the Brazilian savanna (Cerrado) are extremely fire-sensitive, and anthropogenic activities related with deforestation for crop and livestock establishment as well as global warming have shown negative effects on their biodiversity (Pivello 2009; Shlisky et al. 2009; Silveira et al. 2013). Intriguingly, the species has been recorded in the lowlands of the central and meridional Brazilian Amazon and in the western slopes of the Andean mountain range, Colombia. Although we cannot presently discard the possibility that this species is widely distributed in the western Amazon realm, further collection records are required to confirm the disjunct distribution of P. minuta. Natural history. The species is mainly known from leaf litter and dead wood samples collected in well preserved forests; reported at elevations of 152-1430m. Additional material examined (126 specimens). BRAZIL: Amazonas: 59°48’W 2°25’S, 20.ix.1996, A.C. Maicedo e outros #1682, ZF3- Km 41 (2 workers) [INPA]. Lg. Marianill, 24 Km NE of Manaus, ix.1962, W.L. Brown col., #4566 (4 workers) [MZSP]. Manaus, 13.xii.1993, A.B. Casimiro col. (1 worker) [CEPEC]; same data, 16.iv.1988, H. Vasconcelos, #4642 (5 workers) [CEPEC]; same data, 29.ix.1993, A.B. Casimiro col. (4 workers) [CEPEC]; same data, 10.xi.1993, A.B. Casimiro col., Rs 1202 (10 workers) [INPA]; same data, 14.xii.1993, A.B. Casimiro col., 4832, Rs 1301 (6 workers) [INPA]; same data, 23.i.1994, A.B. Casimiro col., #4832, Rs 3114 (4 workers) [DZUP]; same data, 2°5’86”S 60°6’55°W, 20.x.2004, Baccaro e col., Winkler, TEAM-ZF-2- Km 14, B1- PO-0139, 1m 2 de liteira (1 worker) [INPA]; B1 -PO-0153 (1 worker) [INPA]; same data, 21.x.2004, B1-PO-0126 (1 worker) [INPA]; B1 - PO-0137 (1 worker) [INPA]; B1 - PO-0159 (1 worker) [INPA]; B1 - PO-0160 (1 worker) [INPA]; B1 - PO-0157 (1 worker) [DZUP]. Fazenda Experimental da UFAM, 2°39’17.4’’S 60°03’31’’W, 18e 20. ix.2018, Almeida R.P.S. col., ninho em tronco em decomp. Fulakora, Talaridris mandibularis e Pheidole no tronco (1 queen) [DZUP]. Manaquiri, xi.2009, Winkler, T 1 2/500 (4 workers) [DZUP]; T1 1/500 (10 workers) [INPA]; (4 workers) [DZUP]; T1 3/500 (5 workers) [INPA]; T2 2/500, (1 worker) [DZUP]; (10 workers) [INPA]; T2 3/500 (3 workers) [INPA]; (2 workers) [DZUP]; T2 4/500 [INPA]. Reserva Florestal Adolpho Ducke, 4.ix.1962, W.L. Brown Jr. col., M-169 (5 workers) [MPEG]; same data, 02°58’89.3’’S 059°57’67.7’’W, 07.xii.2005, TEAM Project, T 1 1/500 (1 worker) [INPA]; (1 worker) [DZUP]; T2 3/400 (1 worker) [INPA]; T4 10/700 (2 workers) [INPA]; same data, -2.93333 -59.95, 152m, 03.viii.2006, J. Souza & P. Oliveira cols., ANTC10226, pitfall, 8PPBIO Grid, L-O 03, CASENT0179474 (1 worker) [CASC]; same data, 2°55’43’’S 59°56’46’’W, 08.viii.2004, Baccaro e col., Winkler, TEAM-Acamp. principal, 1m 2 liteira, 2/000, amostra 3, A2-PO-0074 (2 workers) [INPA]; A2 - PO-0073 (1 worker) [DZUP]; same data, 24.viii.2005 (2 workers) [INPA]; 9/300 (1 worker) [DZUP]; same data, 2°58’45’’S 59°55’13’’W, 24.i.2005, TEAM-Igarapé Ipiranga, 8/700 (1 worker) [INPA]; A1 - PO-0003 (1 worker) [INPA]; (1 worker) [DZUP]; A1 - PO-0020, 8/700 (1 worker) [DZUP]; A1 - PO-0021 (1 worker) [DZUP]; same data, 02°58’89.3’’S 059°57’67.7’’W, 07.xii.2005, TEAM project, T1 1/500 (1 worker) [INPA]; same data, 13.ii.2007; C1 2/600 (1 worker) [DZUP]; same data, 15.ii.2007, IMA 2 9/300 (1 worker) [CASC]; same data, 29.xi.2006, T6 1/900 (10 workers) [INPA]; (2 workers) [DZUP]. Rio Branco Rd. Km 4 from fork of Amaz. Rte 1, -7.730534 -61.832043, 22.viii.1962, W.L. Brown col., W-292, berlesate, rainforest (1 worker) [ANIC]. COLOMBIA: Nariño: Barbacoas, 01°21’49’’N 78°04’45’’W, 640m, 25-27.vii.2006, A. Miranda & O. Reyes cols., Winkler (2 workers) [DZUP]. Territorio Kofán, 00°30’N 77°13’W, 1430m, 25.ix.1998, E. González leg., Winkler, T 2 191(1 worker) [CEPEC]; same data (1 worker) [DZUP].Published as part of Ladino, Natalia & Feitosa, Rodrigo M., 2020, Taxonomic revision of the genus Prionopelta Mayr, 1866 (Formicidae: Amblyoponinae) for the Neotropical region, pp. 201-249 in Zootaxa 4821 (2) on pages 234-236, DOI: 10.11646/zootaxa.4821.2.1, http://zenodo.org/record/439838
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