9,282 research outputs found
Brasineura troglophilica Silva-Neto & Garcia Aldrete. Recently 2015
No full textBrasineura troglophilica Silva-Neto & García Aldrete, 2015 Variation in the fore wing veins (Figs 9–12) The pattern in the fore wing M vein described by Silva-Neto & García Aldrete (2015) for B. troglophilica is M six branched, with M6 forked resulting in M6a and M6b, but two of the three male specimens collected in 1982 in the Brazilian state of Pará show the following variations: M seven branched, with M7 three branched, resulting in M7a,M7b and M7c (Fig. 9); the other specimen shows M with seven primary branches, with M7 and M4 forked (Fig. 10). A third specimen has the same pattern as the holotype (Fig. 11). The paratype of B. troglophilica has the fore wing M vein six branched, with M6 three branched (Fig. 12). Material examined. 3 males (INPA). Brazil. Pará. Marabá. Serra Norte. (6°05'03.1"S, 50°10'35.5"W). XI.1982. Light trap. Michael Miles.Published as part of Neto, Alberto Moreira Da Silva, García Aldrete, Alfonso N. & Rafael, José Albertino, 2016, A new species of Brasineura Silva-Neto & García Aldrete (Psocodea, ' Psocoptera', Ptiloneuridae), with comments on morphological variation in B. troglophilica and a revised generic diagnosis, pp. 445-450 in Zootaxa 4085 (3) on page 449, DOI: 10.11646/zootaxa.4085.3.8, http://zenodo.org/record/105271
Timnewia jeaneae Silva-Neto, Garcia Aldrete & Rafael 2016
No full textTimnewia jeaneae Silva-Neto, García Aldrete & Rafael, 2016 (Figs 16–23) Timnewia jeaneae Silva-Neto, Garcia Aldrete & Rafael, 2016b: 490, Figs 1–18; Silva-Neto & García Aldrete 2020: 4 (checklist). Material examined. 1 male A. BRAZIL. Amazonas. Reserva ZF 2, km 14, Torre. 02°35′21″S: 60°06′55″W. 13– 31.III.2018. Malaise trap, 24 m from ground level. J.A. Rafael. 1 male B (MNRJ). Same data as the male above. Geographic distribution. Roraima (Serra da Mocidade); Amazonas (Manaus). Variation in the forewing veins. Male (A) with right forewing with two crossveins between 2A and wing margin, and two crossveins between 1A and wing margin (Figs 16, 17), left forewing with one crossvein between 2A and wing margin, and two crossveins between 1A and wing margin (Figs 18, 19). Male (B) with right forewing with one crossvein between 2A and wing margin, and two crossveins between 1A and wing margin (Figs 20, 21), left forewing with one crossvein between 2A and wing margin, and two crossveins between 1A and wing margin (Figs 22, 23).Published as part of Silva-Neto, Alberto Moreira Da, García Aldrete, Alfonso N., Barroso, Karen De Araújo & Rafael, José Albertino, 2021, Timnewia García Aldrete (Psocodea: ' Psocoptera': Ptiloneuridae): new species and variation in the wing venation of T. jeaneae Silva-Neto, García Aldrete & Rafael, pp. 571-579 in Zootaxa 4950 (3) on page 575, DOI: 10.11646/zootaxa.4950.3.9, http://zenodo.org/record/465015
Brasineura Silva-Neto & Garcia Aldrete 2015
No full textBrasineura Silva-Neto & García Aldrete, 2015 Revised generic diagnosis (based on morphological observations mentioned below): Fore wing M 5–7 branched; hind wing M 2–4 branched; outer cusp of lacinial apex markedly sclerotized; hypandrium of one sclerite, broad, setose, with anterior border strongly sclerotized, without projections or with one central posterior projection; phallosome closed anteriorly, rounded, U-shaped, with distinct lateral extensions of the phallobase; side struts anterior, fused to external parameres, these elongate, distally pointed; two pairs of endophallic sclerites; anterior pair elongate, lacking a basal bridge, each arm independent; posterior pair basally fused to form a V-shaped structure, each arm of the V distally forked or rounded, enclosing a membrane with numerous pores.Published as part of Neto, Alberto Moreira Da Silva, García Aldrete, Alfonso N. & Rafael, José Albertino, 2016, A new species of Brasineura Silva-Neto & García Aldrete (Psocodea, ' Psocoptera', Ptiloneuridae), with comments on morphological variation in B. troglophilica and a revised generic diagnosis, pp. 445-450 in Zootaxa 4085 (3) on page 447, DOI: 10.11646/zootaxa.4085.3.8, http://zenodo.org/record/105271
Brasineura diamantina Silva-Neto & Garcia Aldrete
No full text<p> <b> <i>Brasineura diamantina</i> Silva‑Neto & García Aldrete (Figs. 1‑8).</b> </p> <p> <i>Brasineura diamantina</i> Silva-Neto & García Aldrete 2015: 171, Figs. 1-7; Silva-Neto & García Aldrete 2016 (catalog); Silva-Neto, García Aldrete & Rafael 2016b: 445 (taxonomy); Silva-Neto, García Aldrete & Rafael 2016c: 80 (phylogeny); Silva-Neto, García Aldrete & Rafael 2018: 547 (taxonomy).</p> <p> <b>Revised diagnosis.</b> Forewing vein M with 4-7 primary branches; hindwing vein M with 2-5 primary branches. Hypandrium anteriorly concave with border strongly sclerotized and triangular distally (fig. 6 in Silva-Neto & Garcia Aldrete, 2015); phallosome with external parameres not forked, distally with a small tripartite area heavily sclerotized; three pairs of endophallic sclerites; an antero-mesal pair long, slender, proximally almost touching in the middle, bearing a row of small spines, distally pointed; a posterior pair wide based, narrowing distally, then curving distally to a pointed apex; antero-lateral pair short, widest in the middle, narrowing to the ends (fig. 7 in Silva-Neto & Garcia Aldrete, 2015); ninth sternum with an anterior area almost elliptic, slightly concave in the middle, anteriorly and posteriorly; mesal area wide, transverse, with inner margin almost trapezoidal and antero-lateral corners narrowing posteriorly, with apices acuminate; a posterior area with numerous small lines, proximally wide, narrowing posteriorly (Fig. 6); gonapophyses with six large setae on outer lob (Fig. 7).</p> <p> <b>Description of the female</b></p> <p> <b>Color:</b> Body pale yellow, with brown and pale brown areas as indicated below. Compound eyes black, ocelli hyaline, with ochre centripetal crescents; head pattern (Fig. 1); a brown band on vertex, from each compound eye to upper part of ocellar group; a brown irregular band between compound eyes, limited posteriorly by the postclypeus; each gena with a brown band from low- er compound eye to subgenal sulcus. Scape, pedicel and f1 pale brown, f2-f4 brown. Maxillary palps pale yellow, Mx4 more pigmented distally. Legs with coxae yellow; trochanters, femora, tibiae and tarsomeres pale brown. Forewings almost hyaline, as illustrated in Fig. 2; a brown spot on confluence of Cu2-1A; veins brown. Hindwing (Fig. 3) almost hyaline throughout, veins brown.</p> <p> <b>Morphology:</b> Compound eyes without interommatidial setae (Fig. 1). Outer cusp of lacinial tip broad, with five denticles and distally markedly sclerotized (Fig. 4). Forewing pterostigma elongate, constricted proximally, wider in the middle. Areola postica tall, wide basally, triangular, with apex rounded; vein M with five primary branches, M5 distally forked, resulting in M5a and M5b (Fig. 2; see also variation of the other females below). Hindwing Rs-M joined for a distance, Rs, R₂ <b>₊</b> ₃ and R₄ <b>₊</b> ₅ almost straight, M vein 2-branched (Fig. 3; see also variation of the other females below). Subgenital plate broad, wide basally, with sides converging towards a straight posterior border, pigmented area wide, V-shaped, setae as illustrated in Fig. 5. Ninth sternum (Fig. 6) broad, with three distinct areas, an anterior area weakly sclerotized, almost elliptic, slightly concave in the middle, anteriorly and posteriorly; a mesal area heavily sclerotized, wide, transverse, with inner margin almost trapezoidal and antero-lateral corners narrowing posteriorly, with apices acuminate; a posterior área with numerous small lines, proximally wide, narrowing posteriorly. Gonapophyses: v1 stoutest near its base rather than in the middle and distally acuminate; outer edge and ends heavily sclerotized; v2 + 3 broad, narrowing at the ends, with long, almost rectangular heel, distally blunt; six setae on out- er lobe, distal process slender, short and distally lightly acuminate (Fig. 7). Epiproct triangular, with three mesal setae, other setae as illustrated in Fig. 8. Paraprocts almost triangular, broad, sensory fields with 27 trichobothria on basal rosettes; setae as illustrated in Fig. 8.</p> <p> <b>Measurements (in microns):</b> FW: 4660, HW: 3284, F: 1235, T: 2138, t1: 832, t2: 88, t3: 133, f1: 990, f2: 1044, f3: 913, f4: 970, Mx4: 315, IO: 478, D: 448, d: 294, PO: 0.66.</p> <p> Below are the additional specimens (9 females and 22 males) that presented the pattern of fore-hindwing veins identical to the female described above and to the holotype of <i>B. diamantina</i> (see figures 2 and 3 in Silva- Neto & García Aldrete, 2015).</p> <p> <b>Material examined: Females:</b> 2 of Brazil, Bahia, Chapada Diamantina,Abaíra, Catolés de Cima, Cachoeira Pinga Pinga. 07°08’07.2”S, 35°47’17.8”W. 01.xi.2013. Light trap. Nascimento <i>et al.,</i> 5 (including the female described above) of Brazil, Bahia, Chapada Diamantina, Mucugê, Sempre Viva, Corrego Boiadeiro, 13°00’S, 41°22”W. Malaise 4. vii.2015. 3 of Brazil, Bahia, Chapada Diamantina, Piatã, Cachoeira do Patricio. 13°05’13”S, 41°51’10”W. 05.xi.2013. Menezes, E. Light trap. <b>Males:</b> 10 of Brazil, Bahia, Chapada Diamantina, Abaíra, Catolés de Cima, Cachoeira Pinga Pinga. 07°08’07.2”S, 35°47’17.8”W. 01.xi.2013. Light trap. Nascimento <i>et al.,</i> 7 of Brazil, Bahia, Chapada Diamantina, Mucugê, Sempre Viva, Corrego Boiadeiro, 13°00’S, 41°22”W. Malaise 4. vii.2015. 2 of Brazil, Bahia, Chapada Diamantina, Piatã, Cachoeira do Patricio. 13°05’13”S, 41°51’10”W. 05.xi.2013. Menezes, E. Light trap. 2 of Brazil, Bahia, Chapada Diamantina, Mucugê, Sempre Viva. 12°57’585”S, 41°20’495”W. Ligth trap. iii.2018. Vanine & Daniel. 1 of Brazil, Bahia, Andaraí, Igatu, Rio Coisa Boa. 12°53’33.7”S, 41°18’58.8”W. 11.iii.2011. Luz. Calor, A. Camelier, P. Zanata, A.</p> <p> <b>Variations and anomalies in the fore‑ and hindwing veins of males</b></p> <p> Below, the 34 different types of variations and anomalies, of the fore- and hindwing veins, found in males and females of <i>B. diamantina</i> are described:</p> <p> <b>Type 1.</b> Forewing M with four primary branches, without secondary branches (variation) (Fig. 9).</p> <p> <b>Type 2.</b> Forewing M with four primary branches, M₄ forked resulting in M₄ a and M₄ b (variation) (Fig. 10).</p> <p> <b>Type 3.</b> Forewing M with four primary branches, M₂ and M₄ forked, resulting in M₂ a, M₂ b, M₄ a and M₄ b (variation) (Fig. 11).</p> <p> <b>Type 4.</b> Forewing M with four primary branches, M₃ forked and M₄ forked distally, resulting in M₃ a, M₃ b, M₄ a and M₄ b; R₂ <b>₊</b> ₃ forked, with R₂ connect- ed to pterostigma and this with a transverse vein (variation and anomaly) (Fig. 12).</p> <p> <b>Type 5.</b> Forewing M with five primary branches, without secondary branches (variation) (Fig. 13).</p> <p> <b>Type 6.</b> Forewing M with five primary branches, with M₃ and M₅ forked, resulting in M₃ a, M₃ b, M₅ a and M₅ b (variation) (Fig. 14).</p> <p> <b>Type 7.</b> Forewing M with five primary branches, with M₂ and M₅ forked, resulting in M₂ a, M₂ b, M₅ a and M₅ b (variation) (Fig. 15).</p> <p> <b>Type 8.</b> Forewing M with five primary branches, with M₂ forked resulting in M₂ a, M₂ b and M₅ three branched resulting in M₅ a, M₅ b ₁ and M₅ b ₂ (variation) (Fig. 16).</p> <p> <b>Type 9.</b> Forewing M with five primary branches, with M₄ and M₅ forked, resulting in M₄ a, M₄ b, M₅ a and M₅ b (variation) (Fig. 17).</p> <p> <b>Type 10.</b> Forewing M with five primary branches, M₅ three branched, resulting in M₅ a, M₅ b ₁ and M₅ b ₂ (variation) (Fig. 18).</p> <p> <b>Type 11.</b> Forewing M with five primary branches, M₃ forked resulting in M₃ a M₃ b and M₅ three branched resulting in M₅ a, M₅ b ₁ and M₅ b ₂ (variation) (Fig. 19).</p> <p> <b>Type 12.</b> Forewing M of five primary branches, M₅ forked, resulting in M₅ a, and M₅ b and with a transverse vein between them (variation and anomaly) (Fig. 20).</p> <p> <b>Type 13.</b> Forewing M with five primary branches, M₅ three branched, resulting in M₅ a, M₅ b ₁ and M₅ b ₂; vein R₄ <b>₊</b> ₅ distally forked (variation and anomaly) (Fig. 21).</p> <p> <b>Type 14.</b> Forewing M with five primary branches, with M₄ and M₅ forked, resulting in M₄ a, M₄ b, M₅ a and M₅ b and with a transverse vein between M₄ b and M₅ a (variation and anomaly) (Fig. 22).</p> <p> <b>Type 15.</b> Forewing M of five primary branches, M₅ forked, resulting in M₅ a and M₅ b and with a spur-vein in M₅ b (variation and anomaly) (Fig. 23).</p> <p> <b>Type 16.</b> Forewing M with six primary branches, without secondary branches (variation) (Fig. 24).</p> <p> <b>Type 17.</b> Forewing M with six primary branches, M₆ forked resulting in M₆ a and M₆ b (variation) (Fig. 25).</p> <p> <b>Type 18.</b> Fore wing M with six primary branches, M₆ three branched, resulting in M₆ a, M₆ b ₁ and M₆ b ₂ (variation) (Fig. 26).</p> <p> <b>Type 19.</b> Forewing M with six primary branches, M₄ forked resulting in M₄ a and M₄ b (variation) (Fig. 27).</p> <p> <b>Type 20.</b> Forewing M with six primary branches, M₆ forked, resulting in M₆ a and M₆ b, areola postica with a spur-vein (variation and anomaly) (Fig. 28).</p> <p> <b>Type 21.</b> Forewing M of six primary branches, M₆ forked, resulting in M₆ a and M₆ b and with a spur-vein in M₆ b (variation and anomaly) (Fig. 29).</p> <p> <b>Type 22.</b> Forewing M with six primary branches, M₆ forked, with M₆ a three branched and M₆ b as a spur-vein (variation and anomaly) (Fig. 30).</p> <p> <b>Type 23.</b> Forewing M with six primary branches, M₅ and M₆ fused proximally and subsequently trifurcated (variation and anomaly) (Fig. 31).</p> <p> <b>Type 24.</b> Forewing M with six primary branches, M₆ forked resulting in M₆ a, and M₆ b with a transverse vein between them (variation and anomaly) (Fig. 32).</p> <p> <b>Type 25.</b> Forewing M with six primary branches, M₆ forked resulting in M₆ a, and M₆ b with a transverse vein between them and M₆ a forked (variation and anomaly) (Fig. 33).</p> <p> <b>Type 26.</b> Forewing R₄ <b>₊</b> ₅ distally forked (anomaly) (Fig. 34).</p> <p> <b>Type 27.</b> Forewing with a crossvein between R₄ <b>₊</b> ₅ and M (anomaly) (Fig. 35).</p> <p> <b>Type 28.</b> Hindwing M with two primary branches, M₂ forked, resulting in M₂ a and M₂ b (variation) (Fig. 36).</p> <p> <b>Type 29.</b> Hindwing M vei with three primary branches (variation) (Fig. 37).</p> <p> <b>Type 30.</b> Hindwing M with three primary branches, M₃ distally branched, resulting in M₃ a and M₃ b (variation) (Fig. 38).</p> <p> <b>Type 31.</b> Hindwing M with four primary branches (variation) (Fig. 39).</p> <p> <b>Type 32.</b> Hindwing M with four primary branches; R₂ <b>₊</b> ₃ distally forked (variation and anomaly) (Fig. 40).</p> <p> <b>Type 33.</b> Hindwing M with five primary branches. (variation) (Fig. 41).</p> <p> <b>Type 34.</b> Hindwing M with two primary branches, and with R₂ <b>₊</b> ₃ distally forked (variation and anomaly) (Fig. 42).</p> <p> <b>Variations and anomalies in the fore‑hindwing veins of females</b></p> <p>17 females had some type of variation or anomaly described above, at least on one of the fore-hindwing (left or right or both) as described below:</p> <p>1 female (F1) with right forewing type 5 and left forewing type 23; 1 female (F2) with right forewing type 17 and left forewing type 10; 1 female (F3) with forewings type 17; 1 female (F4) with left forewing type 2; 1 female (F5) with left forewing type 1; 1 female (F6) with left forewing type 10; 2 females (F7, F14) with right forewing type 10; 3 females (F8, F11, F13) with right forewing type 17; 1 female (F9) with right forewing type 17 and right hindwing type 29; 1 female (F10) with left forewing type 5; 1 female (F12) with forewings type 17, right hindwing type 32 and left hindwing type 30; 1 female (F15) with with right forewing type 12; 1 female (F16) with left forewing type 17; 1 female (F17) with right forewing type 4 and left forewing type 3.</p> <p> <b>Material examined:</b> 8 females (F1-F7, F14): Brazil, Bahia, Chapada Diamantina, Abaíra,Catolés de Cima,Cachoeira Pinga Pinga. 07°08’07.2”S, 35°47’17.8”W. 01.xi.2013. Light trap. Nascimento <i>et al.,</i> 5 females (F8-F10, F16, F17): Brazil, Bahia, Chapada Diamantina, Mucugê, Sempre Viva, Córrego Boiadeiro, 13°00’S, 41°22”W. Malaise 4. vii.2015. 3 females (F11, F12, F15): Brazil, Bahia, Chapada Diamantina, Piatã, Cachoeira do Patricio. 13°05’13”S, 41°51’10”W. 05.xi.2013. Menezes, E. Light trap. 1 female (F23): Brazil, Bahia, Chapada Diamantina, Mucugê, Sempre Viva, 12°57’585”S, 41°20’495”W. Ligth trap. iii.2018. Vanine & Daniel.</p>Published as part of <i>Lima, Daniel Moura, Neto, Alberto Moreira da Silva, García-Aldrete, Alfonso Neri & Bravo, Freddy, 2018, Description of the female of Brasineura diamantina Silva-Neto & García Aldrete (Psocodea: " Psocoptera ": Ptiloneuridae), with comments on variation in the wing venation, pp. 1-9 in Papéis Avulsos de Zoologia 58</i> on pages 2-7, DOI: 10.11606/1807-0205/2018.58.43, <a href="http://zenodo.org/record/4637319">http://zenodo.org/record/4637319</a>
SILVA, G. V. da; SILVA, E. C. M. da; LIMA NETO, B. M. (orgs.): Espaços do sagrado na cidade antiga. Vitória: GM Editora, 2017, 354 pp. [ISBN: 978-85-8087-168-5].
No full text[ES] Reseña del libro Silva, G. V. da; Silva, E. C. M. da; Lima
Neto, B. M. (orgs.): Espaços do sagrado
na cidade antiga
Triplocania umbrataoides Silva-Neto & Aldrete & Rafael 2018, sp. nov.
No full text<i>Triplocania umbrataoides</i> sp. nov. <p> <i>Triplocania umbrata</i> García Aldrete, 1999: 164-165: male-female association by error). (Figs. 27-41).</p> <p> <b>Diagnosis:</b> Forewing veins R₂₊₃ to Cu1a with a brown spot at wing margin, from M1 to anterior end of wing, the vein spots connected to form a slender marginal band; other brown areas as illustrated (Figs. 28-29); setae of the forewing veins arising from brown areolae; vein Rs notably longer than R₂₊₃, R₄₊₅ and M stem, this concave before its first bifurcation. Hypandrium with a large central sclerite, anteriorly convex, with mesal processes directed outwards; posterior process stout; distally cleft in the middle, with projections directed outwards. Phallosome with side struts fused posteriorly to external parameres. Ninth sternum broad, anteriorly with two blunt projections, leaving between them a membranous concave area; a mesal transverse sclerotized band in the middle; two almost elliptic areas, well defined, near posterior border, with a pigmented band, almost rectangular between them.</p> <p> <b> Male: <i>Color:</i></b> Compound eyes black, ocelli hyaline, with ochre centripetal crescents; head pattern (Fig. 27). Scape and pedicel yellow. Femora pale yellow; tibiae pale yellow with distal ends yellow; tarsomeres 1-3 yellow. Forewings (Figs. 28-29); pterostigma almost entirely pigmented, with a central hyaline area; veins. Hindwing almost hyaline, with brown spots distally on R₂₊₃, R₄₊₅ and M; veins brown.</p> <p> <b>Morphology:</b> Compound eyes without interommatidial setae. Outer cusp of lacinial tip broad, with three denticles (Fig. 31). Forewing pterostigma almost triangular, narrow basally; Rs sinuous, R₂₊₃ slightly convex, R₄₊₅ straight, M concave, M₁ slightly convex, M₂ and M₃ straight; areola postica tall, with round apex, 2A not reaching wing margin (Fig. 28); right forewing anomalous, having an additional crossvein from the proximal end of Rs to R₁ (Fig. 29). Hindwing Rs almost straight, R₂₊₃ straight, R₄₊₅ almost straight, M sinuous (Fig. 30). Hypandrium of three sclerites; central sclerite flanked anteriorly by stout, irregular side sclerites; setae as illustrated (Fig. 32). Phallosome (Fig. 33) with side struts independent, V-shaped, with a strong narrowing in its connection to external parameres, these basally wide, distally rounded, bearing pores; three pairs of endophallic sclerites, anterior pair with arms L-shaped, close to each other, distally narrowing to end; mesal pair with arms Y-shaped, proximal arms with small protuberances; distal arms bow-shaped, ending in a rounded, hyaline area; median arms curved, slender, directed posteriorly, acuminate; posterior pair proximally wide, membranous, distally sclerotized, curved inwards. Epiproct wide basally, with sides converging to rounded posterior border, three setae mesally, other setae as illustrated (Fig. 34). Paraprocts broad, rounded; sensory fields with 27 trichobothria on basal rosettes, setae as illustrated (Fig. 34).</p> <p> <b>Measurements (in microns):</b> FW:3079,HW:2142,F: 774, IO: 388, D: 311, d: 184, IO/d: 1.24, PO: 0.66.</p> <p> <b> Female: <i>Color:</i></b> Essentially as in the male.</p> <p> <b>Morphology:</b> Head as in the male (Fig. 35). Outer cusp of lacinial tip broad, with three denticles (Fig. 38). Fore- and hind- wings (Figs. 36, 37) as in the male. Subgenital plate broad, pigmented area widely concave, setae as illustrated (Fig. 39); Ninth sternum (Fig. 40). Gonapophyses: v1 long, slender, heavily sclerotized; v₂₊₃ stout, wider in the middle, with anterior margin almost straight, posterior margin concave, with three setae on v2, distal process slender, acuminate, basally with a field of microsetae (Fig. 79). Epiproct triangular, setae as illustrated (Fig. 41). Paraprocts broadly triangular, sensory fields with 32 trichobothria on basal rosettes, setae as illustrated (Fig. 41).</p> <p> <b>Measurements (in microns):</b> FW: 3332, HW: 2366, F: 1040, IO: 410, D: 330, d: 198, IO/d: 2.07, PO: 0.6.</p> <p> <b>Etymology:</b> The specific name refers to the similarity of this species to <i>T.umbrata.</i></p> <p> <b> Material examined: <i>Holotype male:</i></b> Peru. Madre de Dios. Río Tambopata Reserved Zone. 30 km (air) SW Puerto Maldonado, 290 m. 12°50’S, 69°20’W. 14.IX.1984. Smithsonian Institution Canopy Fogging Project. T.L. Erwin <i>et al.</i> (INPA). <i>Paratype:</i> 1 female, same data as the holotype, except for date, 10.IX.1984. (INPA).</p> <p> <b>Comments:</b> This species was erroneously identified by García Aldrete (1999) as <i>T. umbrata;</i> it has a similar pattern of pigmentation and wing venation as <i>T. umbrata,</i> but the ninth sternum is different (compare Fig. 40 in this paper with fig. 21 in New (1980). The phallosome of <i>T. umbrataoides</i> is similar to other six <i>Triplocania</i> species (<i>T. lucida</i> Roesler, <i>T. calori</i> Silva-Neto, García Aldrete & Rafael, <i>T. capixaba</i> Silva-Neto, García Aldrete & Rafael, <i>T. ecuatoriana</i> Silva-Neto, García Aldrete & Rafael, <i>T. ecuatorianaoides</i> Silva-Neto, García Aldrete & Rafael, and <i>T.asisensis</i> González,Carrejo & García Aldrete). <i>Triplocania umbrataoides</i> differs from all the other species with similar phallosomes in details of the hypandrium and phallosome (compare Figs. 71, 72 in this paper with figs. 5, 6, 20, 21, 34, 35, 41, 42 in Silva-Neto <i>et al.</i> (2016c),figs. 36, 37 in Roesler (1940) and figs. 42, 43 in González-Obando <i>et al.</i> (2017)).</p>Published as part of <i>Silva-Neto, Alberto Moreira da, Aldrete, Alfonso Neri García & Rafael, José Albertino, 2018, Triplocania Roesler: a new species, redescriptions, description of the female of Triplocania spinosa Mockford, and revalidation of the original combination of Belicania cervantesi (García Aldrete) (Psocodea: ' Psocoptera': Ptiloneuridae), pp. 1-11 in Papéis Avulsos de Zoologia 58</i> on pages 8-11, DOI: 10.11606/1807-0205/2018.58.21, <a href="http://zenodo.org/record/4614158">http://zenodo.org/record/4614158</a>
Field dependence of the magnetic spectrum in anisotropic and Dzyaloshinskii-Moriya antiferromagnets. I. Theory
No full textWe consider theoretically the effects of an applied uniform magnetic field on the magnetic spectrum of anisotropic two-dimensional and Dzyaloshinskii-Moriya layered quantum Heisenberg antiferromagnets. The former case is relevant for systems such as the two-dimensional square lattice antiferromagnet Sr2CuO2Cl2, while the latter is known to be relevant to the physics of the layered orthorhombic antiferromagnet La2CuO4. We first establish the correspondence between the low-energy spectrum obtained within the anisotropic nonlinear sigma model and by means of the spin-wave approximation for a standard easy-axis antiferromagnet. Then, we focus on the field-theory approach to calculate the magnetic-field dependence of the magnon gaps and spectral intensities for magnetic fields applied along the three possible crystallographic directions. We discuss the various possible ground states and their evolution with temperature for the different field orientations, and the occurrence of spin-flop transitions for fields perpendicular to the layers (transverse fields) as well as for fields along the easy axis (longitudinal fields). Measurements of the one-magnon Raman spectrum in Sr2CuO2Cl2 and La2CuO4 and a comparison between the experimental results and the predictions of the present theory will be reported in paper II of this research work [L. Benfatto Phys. Rev. B 74, 024416 (2006)]. (c) 2006 American Institute of Physics
Field dependence of the magnetic spectrum in anisotropic and Dzyaloshinskii-Moriya antiferromagnets. II. Raman spectroscopy
No full textWe compare the theoretical predictions of the previous paper on the field dependence of the magnetic spectrum in anisotropic two-dimensional and Dzyaloshinskii-Moriya layered antiferromagnets [L. Benfatto and M. B. Silva Neto, Phys. Rev. B 74, 024415 (2006)], with Raman spectroscopy experiments in Sr2CuO2Cl2 and untwinned La2CuO4 single crystals. We start by discussing the crystal structure and constructing the magnetic point group for the magnetically ordered phase of the two compounds, Sr2CuO2Cl2 and La2CuO4. We find that the magnetic point group in the ordered phase is the m_mm_ orthorhombic group, in both cases. Furthermore, we classify all the Raman active one-magnon excitations according to the irreducible co-representations for the associated magnetic point group. We find that the in-plane (or Dzyaloshinskii-Moriya) mode belongs to the DA(g) co-representation while the out-of-plane (XY) mode belongs to the DBg co-representation. We then measure and fully characterize the evolution of the one-magnon Raman energies and intensities for low and moderate magnetic fields along the three crystallographic directions. In the case of La2CuO4, a weak-ferromagnetic transition is observed for a magnetic field perpendicular to the CuO2 layers. We demonstrate that from the jump of the Dzyaloshinskii-Moriya gap at the critical magnetic field H-c similar or equal to 6.6 T one can determine the value of the interlayer coupling J(perpendicular to)/J similar or equal to 3.2x10(-5), in good agreement with previous estimates. We furthermore determine the components of the anisotropic gyromagnetic tensor as g(s)(a)=2.0, g(s)(b)=2.08, and the upper bound g(s)(c)=2.65, also in very good agreement with earlier estimates from magnetic susceptibility. For the case of Sr2CuO2Cl2, we compare the Raman data obtained in an in-plane magnetic field with previous magnon-gap measurements done by electron spin resonance (ESR). Using the very low magnon gap estimated by ESR (similar to 0.05 meV), the data for the one-magnon Raman energies agree reasonably well with the theoretical predictions for the case of a transverse field (only hardening of the gap). On the other hand, an independent fit of the Raman data provides an estimate for g(s)similar or equal to 1.98 and gives a value for the in-plane gap larger than the one measured by ESR. Finally, because of the absence of the Dzyaloshinskii-Moriya interaction in Sr2CuO2Cl2, no field-induced modes are observed for magnetic fields parallel to the CuO2 layers in the Raman geometries used, in contrast to the situation in La2CuO4. (c) 2006 American Institute of Physics
One-magnon Raman scattering in La2CuO4: The origin of the field-induced mode
No full textWe investigate the one-magnon Raman scattering in the layered antiferromagnetic La2CuO4 compound. We find that the Raman signal is composed by two one-magnon peaks: one in the B1g channel, corresponding to the Dzyaloshinskii-Moryia mode, and another in the B3g channel, corresponding to the XY mode. Furthermore, we show that a peak corresponding to the XY mode can be induced in the planar (RR) geometry when a magnetic field is applied along the easy axis for the sublattice magnetization. The appearance of such a field-induced mode signals the existence of a magnetic state above the Néel temperature TN, where the direction of the weak-ferromagnetic moment lies within the CuO2 planes. © 2005 The American Physical Society
Impurity susceptibility and the fate of spin-flop transitions in lightly doped La2CuO4
No full textWe investigate the occurrence of a two-step spin-flop transition and spin reorientation when a longitudinal magnetic field is applied to lightly hole doped La2CuO4. We find that for large and strongly frustrating impurities, such as Sr in La2-xSrxCuO4, the huge enhancement of the longitudinal susceptibility suppresses the intermediate flop and the reorientation of spins is smooth and continuous. Contrarily, for small and weakly frustrating impurities, such as O in La2CuO4+y, a discontinuous spin reorientation (two-step spin-flop transition) takes place. Furthermore, we show that for La2-xSrxCuO4 the field dependence of the magnon gaps differs qualitatively from the La2CuO4 case, a prediction to be verified with Raman spectroscopy or neutron scattering
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