171,127 research outputs found
Abbottella (Abbottella) aenea Watters 2010
No full text<i>Abbottella</i> (<i>Abbottella</i>) <i>aenea</i> Watters, 2010 <p>Figures 3 N–R, 8 C</p> <p> <b>Type material.</b> UF 434777, holotype. UF 434778, 1 paratype; BMSM 17971, 2 paratypes; OSUM 35490, 2 paratypes.</p> <p> <b>Type locality.</b> Dominican Republic, La Altagracia Province, Punta Cana.</p> <p> <b>Other material examined.</b> GTW 14181a, from the type locality.</p> <p> <b>Distribution and habitat.</b> Known only from the type locality. Specimens were found under moldy leaf litter.</p> <p> <b>Remarks.</b> This species is included here for comparison. See under <i>A. milleacantha</i>, below.</p>Published as part of <i>Watters, G. Thomas, 2013, New taxa and distributional notes on Abbottella and related taxa (Gastropoda: Littorinoidea: Annulariidae), pp. 1-22 in Zootaxa 3646 (1)</i> on page 13, DOI: 10.11646/zootaxa.3646.1.1, <a href="http://zenodo.org/record/283728">http://zenodo.org/record/283728</a>
Paradoxipoma enigmaticum Watters, 2014, new species
No full textParadoxipoma enigmaticum new species Figures 8 A–E, 12 A Type material. UF 479320, holotype (figs. 8 A, B); UF 479321 (3), paratypes (figs. 8 C, D), from type locality; UF 479322 (1), paratype (fig. 8 E), Rockville Quarry, Gracy Rock Hill. Type locality. Limestone hill on south side of Sibun River at Cedar Banks, Belize District, Belize, 50 m. Distribution and habitat. Known only from limestone outcrops in the vicinity of Gracy Rock Hill in Belize District, Belize, at ca. 50 m elevation. These limestone knolls extend south of the type locality for ca. 8 km. Conservation. None of the localities are protected; one of the two known sites is a quarry. Other material (specimens examined: 172). Belize. Belize District: UF 207315 (83), Rockville Quarry, Gracy Rock Hill; UF 207514 (89), limestone hill on south side of Sibun River at Cedar Banks, 50 m. Description. Shell conic, turbinate, thin, translucent, adnate. Largest adult specimen seen 9.6 mm (nondecollate). Protoconch retained in adult, 1.5 whorls, smooth, prominent, flattened, dark brown or tan with a dark top, demarcation between protoconch and teleoconch very indistinct. Teleoconch of 3.5 rounded whorls with a blunt angle at the level of the juncture with the peristome. Umbilicus wide, open. Spiral sculpture of ca. 17 low threads, distantly spaced below suture, becoming progressively closer together towards the angle; the threads abruptly end at the angle and are absent on the base except for very faint signs of a few cords in the umbilicus. Axial sculpture of numerous very fine, very closely spaced lamellae. Intersections of axial and spiral sculpture minutely beaded or fenestrated. Suture strongly indented, smooth. Aperture somewhat triangular. Inner lip absent. Outer lip very narrow, reflection scarcely apparent, adnate with previous whorl. Base color dingy white or tan, earlier whorls often more darkly colored than last whorl. Many specimens show varying degrees of tan spiral banding composed of three bands above the angulation and one or two below; bands often broken into dots or dashes; bands visible in aperture and on outer lip. Opercula known from only two specimens, both incomplete, but having the remains of a multispiral, narrow, calcareous lamella with a broad sulcus between the whorls. Radula and anatomy unknown. Variation in specimens. Specimens vary primarily in the intensity of the color pattern. Comparison with other species. Specimens resemble juvenile individuals of other species. The angular whorls and lack of spiral sculpture on the base characterize this species. Remarks. This species seems to be narrowly endemic to a series of limestone knolls that occupy ca. 50 km 2. It co-occurs with H. gruneri and H. kuesteri but is clearly distinguishable from juveniles of those species. Etymology. L. aenigma, inexplicable, mystery.Published as part of Watters, G. Thomas, 2014, A revision of the Annulariidae of Central America (Gastropoda: Littorinoidea), pp. 301-350 in Zootaxa 3878 (4) on page 332, DOI: 10.11646/zootaxa.3878.4.1, http://zenodo.org/record/25270
Gouldipoma coltrorum Watters, 2014, new species
No full textGouldipoma coltrorum new species Figure 5 A–L, 12 D, 13 A, L Type material. UF 479664, holotype (figs. 5 A, B); UF 479666 (5), paratypes, from type locality; UF 479665 (3), paratypes (figs. C – H), Río Escobas, 60 m. Type locality. 4 km N of Morales, Izabal Department, Guatemala. Other material (specimens examined: 102). Guatemala. Izabal Department: UF 190586 (19), Río Escobas, 60 m; UF 9151 (46), UF 213711 (25), Puerto Mátias de Gálves [Santo Tomás de Castilla]; GTW 16018 a (12), entrance to Cuevas del Silvino near Morales. Distribution and habitat. Records are for each end of Cerro San Gil, although it undoubtedly occurs in the intervening range as well. Like G. chrysostiria (below), it appears to occupy the hills bordering a broad river valley, in this case the Río Motagua valley (famous as the only source of jade in Central America). Conservation. The species’ known range is mostly in the Cerro San Gil Ecological Reserve. It may occur in the Cuevas del Silvino National Park as well. Description. Shell conical, high-spired, thin, translucent, last 1 / 8 whorl solute. Smallest adult specimen seen 6.5 mm in length, largest 14.5 mm, average 10.7 mm (decollate). Protoconch usually lost in adult, 1.5 large, rounded, smooth, pale whorls, not clearly demarcated from teleoconch. Teleoconch of 3.5 – 4.5 rounded whorls. Umbilicus small, mostly occluded by outer lip. Spiral sculpture variable: on some specimens only apparent as scalloped margins of axial lamellae, which fade away towards the umbilicus; in others apparent as ca. 26 widely spaced threads. No delimiting cords in the umbilicus. Axial sculpture of numerous (ca. 100) fine, low, narrow lamellae. Suture strongly incised. Tufts absent but the axial lamellae may render the suture minutely serrate. Aperture nearly circular. Inner lip smooth, inconspicuous, scarcely exserted. Outer lip widely reflected perpendicular to whorl, evenly expanded except where joined to previous whorl, widely auriculate posteriorly, composed of numerous coarse lamellae. Base color orangish-tan, some specimens with faint, narrow tan bands; bands are not continuous over adapertural face of peristome. Inner lip (or just within) and first lamella of outer lip usually lavender, rose, or tan. There is a narrow band of the same color just before the abapertural side of the peristome. Operculum multispiral with a calcareous, erect but low reflected lamella. Radula and anatomy unknown. Animal pale cream or tan (fig. 13 A); middle portion of antennae yellow, tips pale tan; area between bases of antennae darker brown, patternless. Eyes black. Variation in specimens. The color and intensity of the colored ring behind the peristome varies from dark rose to barely perceptible. Sculpture varies from almost smooth to minutely scalloped. Populations vary substantially in size: specimens from Río Escobas average 12.6 mm in length whereas those from Puerto Mátias de Gálves average only 8.6 mm. Comparison with other species. Other species also have a colored ring behind the peristome: G. thomasi and G. terecostatum. Gouldipoma coltrorum differs from G. thomasi in the broadly expanded outer lip. It differs from G. terecostatum primarily in possessing spiral sculpture, which is absent in G. terecostatum. Remarks. With these snails’ apparent proclivity for living in broad river valleys bounded by limestone ranges, it might be worthwhile investigating such habitats elsewhere. The valleys of the Río Sico and Río Patuca in Honduras seem likely candidates for yielding new taxa. Etymology. Named for José and Marcus Coltro of Femorale, Inc. who generously donated material of this species and others from Central America.Published as part of Watters, G. Thomas, 2014, A revision of the Annulariidae of Central America (Gastropoda: Littorinoidea), pp. 301-350 in Zootaxa 3878 (4) on page 320, DOI: 10.11646/zootaxa.3878.4.1, http://zenodo.org/record/25270
Lacustricola margaritatus Nagy & Watters 2022, new species
No full textLacustricola margaritatus, new species http://zoobank.org/ urn:lsid:zoobank.org:act: 6901C1A0-3646-4B4C-9D39-D1B21695335E (Figs. 3–6) Aplocheilichthys centralis ‘Kasama TZ 91/135’, non Seegers, 1996: Seegers, 1997: 26. Aplocheilichthys centralis ‘U 88/5’, non Seegers, 1996: Seegers, 1997: 26. Aplocheilichthys centralis, non Seegers, 1996: Langton, 2004: 89–90; Sayer et al. 2018: 210. Aplocheilichthys cf. centralis ‘U 88/17’: Seegers, 1997: 26; Langton, 2004: 88. Aplocheilichthys pumilis, (sic!) non (Boulenger, 1906): Lampke, 1975: 97. Aplocheilichthys pumilus, non (Boulenger, 1906): Copley, 1958: 113 (in part); Greenwood, 1958: 95 (in part); Meinken, 1971: 433; Wildekamp, 1979: 87; Wildekamp et al. 1986: 182 (in part); Seegers et al. 2003: 40 (in part). Aplocheilichthys sp. aff. centralis, ‘Masindi’: Seegers, 1996: 261. Aplocheilichthys sp.: Seegers, 1989: 6; Langton, 2004: 39. Aplocheilichthys sp. UG 90-12: Langton, 2004: 47. Lacustricola centralis (non Seegers, 1996): Nagy, 2020a: 46; Nagy, 2020b: 71. Holotype. RMCA 2021.011.P.0001, male, 26.5 mm SL; Tanzania: Lake Victoria basin: ephemeral swamp about 3.5 km west of Kiziramiaga township, 2.155611 S, 31.632500 E; B. Nagy, K. Østergaard & G. Petneházy, 31 May 2019 [field code: TZN 19-4]. Paratypes. RMCA 2021.011.P.0002, male, 26.4 mm SL; RMCA 2021.011.P.0003–4, 2 females, 25.2–25.3 mm SL; collected with the holotype.— RMCA 2021.011. P.0005, male, 28.0 mm SL; Tanzania: Lake Victoria basin: extensive ephemeral swamp 11 km south of Sanje, 2 km south of Kakuto, 0.877883 S, 31.463367 E; B. Watters, R. Wildekamp & B. Cooper, 16 June 1999 [field code: UG 99-37].— RMCA 2021.011. P.0006–7, 2 males, 22.1–26.1 mm SL; Uganda: Lake Victoria basin: Lutembe Bay, just east of Namulanda, 0.159806 N, 32.561111 E; B. Nagy & K. Østergaard, 12 June 2021 [field code: UGN 21-1].— RMCA 2021.011. P.0008, male, 26.4 mm SL; Uganda: Lake Kyoga basin: 83 km NW Mbale, just NW of Kapiri, 1.661400 N, 33.768700 E; B. Watters, R. Wildekamp & B. Cooper, 5 June 1999 [field code: UG 99-12].— RMCA 2021.011. P.0009, male, 23.0 mm SL; Uganda: Lake Kyoga basin: ephemeral pool about 41 km north of Soroti, just north of Kuju, 2.045767 N, 33.603817 E; B. Watters, R. Wildekamp & B. Cooper, 7 June 1999 [field code: UG 99-18]. Diagnosis. Lacustricola margaritatus belongs to the genus Lacustricola sensu stricto that includes small to medium sized species with moderately deep body, presenting moderate dimorphism and pronounced dichromatism: male with iridescent light blue scales and deeply coloured unpaired fins; female dark grey scale margins and dark grey patches on scales along mid-longitudinal series creating a narrow dark grey stripe. Lacustricola margaritatus is distinguished from all other species of the genus by the following unique combination of characters: male live body colour pattern with vertically elongated iridescent light blue patches at scale centres (vs. rounded), forming a striped appearance of dotted lines on the flank, particularly evident in two or three series below midlongitudinal line (vs. absent or irregular stripes); male having deeply coloured unpaired fins with orange-brown in proximal and median parts (vs. blue or green or dark grey to black) and black narrow distal band (vs. absent); male with yellow colouration on pectoral fin base (vs. silver); both sexes showing inconspicuous postopercular blotch (vs. absent); and in both sexes the cephalic sensory system entirely situated in open grooves at all levels (vs. partially closed tubular in L. pumilus). Description. General body features illustrated in Figures 3–6. Morphometric and meristic characters of holotype and paratypes are summarised in Table 1. Distinct sexual dimorphism is shown in certain body features, as well as size and shape of fins. Males: small species, maximum observed size 28.0 mm SL. General body shape laterally compressed and moderately deep. Greatest vertical body depth in front of pelvic-fin origin (25.7–28.7 % SL) and shallowest at midportion of caudal peduncle (14.9–16.6 % SL). Greatest body width at pectoral-fin base with body progressively narrowing towards caudal-fin base. Dorsal profile straight from snout to nape and slightly convex from nape to origin of dorsal-fin ray, slightly convex along dorsal-fin base, and straight from base of dorsal fin to caudal fin. Ventral profile straight to slightly convex from lower jaw to operculum, convex from operculum to origin of pelvic fin, slightly convex from base of pelvic fin to last anal-fin ray, straight to slightly concave on ventral midline of caudal peduncle. Caudal peduncle relatively deep, length 139–147 as % of its depth. Anus directly anterior to anal-fin origin. Head short, laterally compressed, slightly deeper than wide (head width 81–90 as % of its depth). Snout slightly rounded, significantly smaller than eye diameter (snout length 15–21 % HL). Mouth superior, oblique in profile. Jaws not equal, lower jaw longer than upper, posterior end of corner of mouth at same level as centre of eye. Premaxilla and dentary with many irregularly distributed conical teeth. Orbit moderately large (33–40 % HL). Dorsal-fin set posteriorly, origin posterior to anal-fin origin, both fins originating posterior to mid-length of body. Dorsal and anal fins rounded trapezoidal shape, posterior rays longer than anterior rays. Dorsal fin rays 9–11; anal fin rays 13–16. Pectoral fin subtriangular, with 12 rays, insertion relatively high and posterior to margin of opercular opening; base oblique, upper fin rays placed anteriorly to lower fin rays. Pelvic fin rounded rhomboid, sub-abdominal, origin slightly anterior to mid-length between insertions of pectoral and anal fins, with 6 rays, reaching urogenital papilla aperture. Caudal fin large and rounded, with 13–14 branched rays, plus four or five dorsal and ventral procurrent rays. Scales cycloid, body and head entirely scaled, except for ventral portion of head. Scales in mid-longitudinal series, 25–27, plus two to four transverse rows of scales on caudal-fin base, extending into medial portion of caudal. Transverse rows of scales in front of dorsal-fin origin, 7–8; scale rows around caudal peduncle, 10. Three frontal neuromasts, typically in shallow grooves. Cephalic sensory system at preorbital level open in shallow grooves with two neuromasts; infraorbital series with 10 to 15 minute neuromasts; postorbital system open in shallow groove with two neuromasts; preopercular sensory systems open in shallow groove in both lateral and ventral portions, with seven neuromasts (Fig. 7a). Cephalic sensory system at supraorbital level open in continuous shallow groove, short and oblique, usually with vestigial lobes, with three neuromasts; whereas at supratemporal level open in curved groove, with three or four exposed neuromasts, without pronounced lobes, externally not connecting to postorbital canal (Fig. 7b). Mandibular canal in shallow open groove parallel to outer margin of lower jaw, with two small neuromasts (Fig. 7c). Females: body depth, head depth and suborbital depth smaller than in males (body depth at pelvic-fin origin 21.4–22.9 % SL vs. 25.7–28.7; head depth 70 % HL vs. 72–78; suborbital depth 8–9 % HL vs. 10–14); caudal peduncle shallower than in males (caudal peduncle depth 13.0–13.1 % SL vs. 14.9–15.1; caudal peduncle length 179–185 as % of its depth vs. 139–147); base length of dorsal and anal fins smaller than in male (dorsal-fin base length 11.5–13.0 % SL vs. 13.1–15.1; anal-fin base length 13.9–15.4 % SL vs. 17.2–22.2). Eggs slightly oval, measuring 2.0 mm long and 1.8 mm wide on average (n = 10). Colouration. Distinct sexual dimorphism exposed in body and fin colouration. Live male: illustrated in Figures 4–5. Scales on trunk and caudal peduncle with pattern of vertically elongated iridescent light blue patches at scale centres, with dark grey to brown-grey scale margins along, and dorsally to, mid-longitudinal series, whereas scales of two to three series below with light brown to orange-brown scale margins, forming striped appearance of longitudinal lines on flank. Scales on dorsum above mid-longitudinal series with wider dark margin, resulting in progressively uniform dark grey appearance, whereas scales ventrally with progressively lighter scale centres and narrower margin, resulting in yellow to silver appearance on abdomen from opercle to pelvic fin. Snout and dorsal portion of head dark grey, throat yellow to silver. Iris silver, with dark grey on anterior and posterior portions. Postorbital opercular region iridescent silver. Exposed branchiostegal membrane silver. Base of pectoral fin yellow. Reduced dark grey humeral blotch on post-opercular region. Dark grey vertical blotches on anterodorsal scales of mid-longitudinal series. Median fins orange-brown proximally and medially, light grey distally, most specimens with narrow dark grey distal margin. Anal fin occasionally with light blue iridescence proximally close to base of fin. Pelvic fin light grey to orange-brown, with light blue iridescence proximally. Pectoral fin hyaline. Live female: illustrated in Figure 6, scales on trunk, dorsum and head light grey, lighter to silver on venter. Scales with dark grey-brown margin, creating reticulation on trunk. Scales with pattern of tiny iridescent light blue dots along two to three series below mid-longitudinal line on posteroventral portion of flank, creating reflective longitudinal stripes. Dark grey scale margins and dark grey patches on scales creating dark grey line along mid-longitudinal series. Scales on abdomen from opercle to pelvic fin white to silver, with light blue iridescence. Snout and dorsal portion of head dark grey to brown-grey, throat silver. Iris silver, with dark grey on anterior and posterior portions. Iridescent silver to light blue blotch on postorbital opercular region and iridescent yellow to silver humeral blotch on post-opercular region. Base of pectoral fin yellow. All fins hyaline. Distribution. Lacustricola margaritatus is currently known from streams and swamps in the Lake Victoria basin in north-western Tanzania, south-western Kenya and southern Uganda, and in the Lake Kyoga basin in central Uganda (Fig. 1). Known occurrences are restricted to the Lake Victoria ecoregion. Ecology. Around Lake Victoria the landscape is characterised by flat-topped hills, about 1300 m asl, with forested valley sides, and papyrus swamps leading to swampy inlets at the lakeshore. The Lake Victoria and Lake Kyoga basins experience a bimodal rainfall pattern, with an annual precipitation of around 1250 to 1500 mm in the lakeshore region, but higher for the open lake, concentrated with two peaks during March-May and October-November with comparatively dry periods during December-February and June-July but without a harsh dry season (Burgis & Symoens, 1987; Hughes & Hughes, 1992). At the type locality, Lacustricola margaritatus was found together with Lacustricola bukobanus. At other sites, the accompanying fish fauna consisted of Clarias gariepinus Burchell, Ctenopoma muriei Boulenger, Enteromius apleurogramma Boulenger, E. lineomaculatus Boulenger, E. oligogrammus David, Haplochromis sp., L. bukobanus, Micropanchax sp., Nothobranchius robustus Ahl, N. ugandensis Wildekamp, Protopterus sp., Pseudocrenilabrus multicolour victoriae Seegers, and the introduced species Poecilia reticulata Peters. The type locality is a temporary pool formed on the floodplain of a small seasonal river in the Lake Victoria basin (Fig. 8). The locality is situated about 7 km from where the river enters Lake Victoria. The habitat is an isolated pool in a shallow depression on the floodplain, directly adjacent to the riverbed, and formed primarily as a result of natural processes. At the time of collection of the type specimens, at the end of the rainy season, the habitat was a large and shallow pool more than 20 m long and about 10 m wide, with a maximum depth of 1 m, comprising part of a series of temporary marshes directly associated with the river. At the type locality, all collecting took place in the same general habitat. Aquatic vegetation comprised Nymphaea sp., whereas the edge of the habitat was partially overgrown with grass. The water was turbid, the bottom of the pool was not visible. The water temperature around noon was 27.4° C, the pH was 7.8 and it contained 120 ppm of total dissolved solids. Water parameters, as measured by the authors at nine different sites throughout the range of distribution between 1999 and 2021, were as follows: temperature of 20.0–27.4° C; pH of 7.3–7.8; conductivity of 40–240 μS. Conservation status. Lacustricola margaritatus is recommended to be listed as Least Concern, using the criteria of IUCN version 3.1 (2012). The known extent of occurrence (EOO) is 168,943 km ². Within its area of distribution, the species seems to be widespread in a range of several river drainages in the basins of Lake Victoria and Lake Kyoga, and it is known from more than 25 threat-based locations. However, there is increasing habitat degradation due to expansion of agriculture and urbanisation in the area. The species inhabits freshwater wetlands, breeding in small and shallow, typically seasonal wetland habitats. Wetlands in the Lake Victoria basin have been progressively decreasing as a result of human activities (Sayer et al., 2018). Some sites of known subpopulations of the species are situated adjacent to urban areas. The increasing pressure on land resources, with consequent habitat degradation, will impact the vulnerability of this species in terms of conservation status. No conservation measures are in place for this species, and it is not known from any protected areas. There is a need for improved habitat protection at the locations where the species is known to occur. Further surveys aimed at investigating the entire range of distribution are needed to better determine the appropriate measures for conservation. Biology. Aquarium maintenance of selected specimens was undertaken for observation of breeding behaviour and biology. Lacustricola margaritatus has a non-seasonal mode of reproduction, typical of the family. Eggs are deposited among floating or hanging vegetation. Under captive conditions, a synthetic mop was used successfully as a spawning medium. An embryonic development period of 12–14 days was observed at a temperature of about 22–24 °C. The relatively large eggs measure around 1.8–2.0 mm and the fry can consume Artemia nauplii after hatching. Under captive conditions sexual maturity is reached at an age of five to six months. Etymology. The specific name margaritatus is a Latin participial adjective meaning “adorned with pearls”, referring to the striped colour pattern of distinct pearlescent patches along the longitudinal series on the side of body.Published as part of Nagy, Béla & Watters, Brian R., 2022, Lacustricola margaritatus, a new species of lampeye from the Lake Victoria and Lake Kyoga basins in eastern Africa (Cyprinodontiformes: Procatopodidae), pp. 44-60 in Zootaxa 5128 (1) on pages 50-55, DOI: 10.11646/zootaxa.5128.1.2, http://zenodo.org/record/647947
Abbottella (Abbottella) dichroa Watters, 2013, new species
No full textAbbottella (Abbottella) dichroa new species Figures 1 K–O, 5 Q, 7 C Type material. UF 456801, holotype; length, 6.5 mm; width, 9.9 mm. UF 216112, 31 paratypes, from the type locality. Type locality. Dominican Republic, Samaná Province, just E of El Limón, 10 km E of Las Terrenas, at sea level. ca. 19.29 ° N, - 69.44 ° W. Other material examined. UF 216112, 4 broken, weathered, or immature specimens, from the type locality; UF 216116, 118 specimens, 7 km E of Sánchez, Samaná Province, Dominican Republic; UF 236229, 18 specimens, 11 km E of Sánchez, Samaná Province, Dominican Republic; UF 216114, 10 specimens, 5 km E of Sánchez, Samaná Province, Dominican Republic; Grego coll., 1 specimen, Nagua, María Trinidad Sánchez Province, Dominican Republic. Distribution and habitat. Known from the type locality on the north coast of the Sierra de Samaná of the Cordillera Septentrional to as far west as Nagua, also the region of Sánchez at three sites from 7–11 km E of the town along the south shore of the Samaná Peninsula. Individuals were found crawling on damp, algae-covered rocks on a shaded limestone hillside in a tropical forest. Description. Shell small (largest specimen, 6.7 mm total length x 10.2 mm total width; smallest specimen, 5.3 mm total length x 8.0 mm total width; holotype, 6.5 mm total length including peristome x 9.9 mm total width including peristome), turbinate, whorls adnate except just before lip. Umbilicus wide, ca. 37 % of total width, open to earliest whorls. Protoconch of ca. 1.25 smooth whorls but demarcation between protoconch and teleoconch not well-defined. Teleoconch of 3–3.5 whorls. Axial sculpture of ca. 100 extremely fine lamellae of two strengths on the final whorl, more widely spaced in earlier whorls, often arranged in groups of 1–7 primary lamellae with irregular “empty” spaces interspersed that may be growth stops. Spiral sculpture of 30–36 low, weak cords, slightly stronger in umbilicus, occasionally stronger at periphery and elsewhere. Intersections of primary axial and spiral sculpture form minute elongated pustules or fine prickly sculpture; the sculpture appears more scalloped than serrate on the final whorl but often is more pronounced and prickly on earlier whorls. Suture narrowly channeled, serrate. Aperture double, circular (4.4 mm maximum width in holotype), solute or barely adnate with the auricle joining the final whorl, deflected to various degrees. Inner lip smooth, well-exserted. Outer lip expanded, composed of numerous lamellae, narrowest at the 10–11 o’clock position, auriculate. Base color of shell uniformly white or brown, rarely light tan, without any indication of bands on the whorls, although bands are apparent on both sides of outer lip. Sculpture white. Operculum multispiral with a calcareous, vertical lamella. Variation in specimens. 183 specimens seen. The most obvious variation is in color; this species occurs in two colors, white or brown, with little evidence of intergrades, although all have a white outer lip banded with brown. Specimens also vary in the degree of deflection of the aperture and the height of the spire. Comparison with other species. Abbottella adolfi peninsularis (Figure 3 J–L) and A. sanchezi (Figure 4 J–N) have much finer, denser sculpture resembling sandpaper and the umbilicus of those species has two or more strong spiral cords; A. dichroa lacks these cords. Abbottella sosuaensis (Figure 4 O–S) has fewer, almost obsolete, axial lamellae, the sculpture is weakly beaded rather than scalloped or prickly, the outer lip is narrower and deflected abaperturally. In A. tenebrosa (Figure 1 U–Y) the axial sculpture is obsolete and the opercular lamella is oblique. The peculiar sculpture of A. dichroa, arranged in “blocks” separated by smooth areas, is shared by A. adolfi peninsularis, A. sanchezi, and A. sosuaensis. Remarks. This species is peculiar in having two color morphs in the same population: white or brown. Like other species on the Samaná Peninsula, specimens have been broken through on the first half of the final whorl by a predator (Figure 5 Q). Etymology. Gr. di -, two + Gr. chroa, color of the skin; in reference to the two color morphs.Published as part of Watters, G. Thomas, 2013, New taxa and distributional notes on Abbottella and related taxa (Gastropoda: Littorinoidea: Annulariidae), pp. 1-22 in Zootaxa 3646 (1) on pages 6-7, DOI: 10.11646/zootaxa.3646.1.1, http://zenodo.org/record/28372
The Origin of the Jackson Purchase Historical Society (Based upon minutes kept by John G. Watters)
No full textThe Origin of the Jackson Purchase Historical Society (Based upon minutes kept by John G. Watters)
John C. Watter
FIGURE 4. A–H in Review of the Hispaniolan Parachondria (Chondropomorus) complex (Gastropoda: Littorinoidea: Annulariidae)
No full textFIGURE 4. A–H. Parachondria (Chondropomorus) olssoni (Pilsbry, 1933). A, B. ANSP 160978a, holotype, 14.5 mm. C, D. UF 119142, 14.4 mm. E. UF 158947, 14.7 mm. F. GTW 6834a, 15.5 mm. G. GTW 6834a, detail of spire. H. GTW 6834a, detail of suture.Published as part of Watters, G. Thomas, 2016, Review of the Hispaniolan Parachondria (Chondropomorus) complex (Gastropoda: Littorinoidea: Annulariidae), pp. 245-275 in Zootaxa 4127 (2) on page 269, DOI: 10.11646/zootaxa.4127.2.2, http://zenodo.org/record/27177
Leiabbottella soluta Pfeiffer 1852
No full textLeiabbottella soluta (Pfeiffer, 1852) Figures 2 F–I, 7 D Type material. Not located. Type locality. Island of Santo Domingo. Restricted by Watters (2012) to the southern edge of Los Haitises Mountains, N of Majagual, ca. 12 km NW of Sabana Grande de Boyá, Monte Plata Province, Dominican Republic. However, this is now believed to be a separate species, Leiabbottella thompsoni new species. The type locality of L. soluta is herein corrected to Yásica Abajo, Puerto Plata Province, Dominican Republic. Other material examined. UF 216196, 7 km SSW of Yásica Abajo, Puerto Plata Province, Dominican Republic, at 800 m. Distribution and habitat. Known only from Yásica Abajo in the Cordillera Septentrional, which is on the road over the mountains between Puerto Plata and Santiago de los Caballeros. Comparison with other species. See comparison under Leiabbottella thompsoni (Figure 2 A–E). Remarks. Watters (2012) identified Pfeiffer’s Choanopoma solutus with a specimen from the Majugual area. At the time the presence of another, closely related species was unknown. Examination of over 200 specimens of this species has revealed that the description and figure of C. solutus better match the second species from Yásica Abajo in the Cordillera Septentrional (compare Figures 3 F and G). The Majugual species in the Cordillera Central is here described as new, Leiabbottella thompsoni.Published as part of Watters, G. Thomas, 2013, New taxa and distributional notes on Abbottella and related taxa (Gastropoda: Littorinoidea: Annulariidae), pp. 1-22 in Zootaxa 3646 (1) on page 18, DOI: 10.11646/zootaxa.3646.1.1, http://zenodo.org/record/28372
Supporting the M in STEM Using Online Maths Support Modules
No full textRecently, a range of mathematics support centres and online approaches have emerged in order to address the well-recognised limitations in the mathematical skills of STEM undergraduates (Jackson & Johnson, 2013). Whilst these approaches are often stand-alone without a discipline-specific context, studies have shown that students reported a positive impact of mathematics support on retention, confidence, performance and ability to cope with the various mathematical demands of their courses (Hillock, Jennings, Roberts, & Scharaschkin, 2013; Ní Fhloinn, Fitzmaurice, Mac an Bhaird, & O’Sullivan, 2014). We have developed and implemented a purely online, in-context mathematical support environment, placed in a chemistry and biochemistry context, with 24-h access, termed the Maths Skills Site (MSS), for STEM higher education students undertaking first-year science subjects (Johnston, Watters, Brown, & Loughlin, 2016; Loughlin, Johnston, Watters, Brown, & Harman, 2015). This chapter will review the development of current online learning support scenarios for mathematics in STEM and provide two case study analyses (first-year courses in chemistry and biochemistry), for the outcomes from two years of implementation. The findings from the case studies cover student perceptions, analysis of patterns of student usage of the MSS by mathematical topics and usage over time. Improvements were observed in student achievement of grades of five (credit), upon student usage of the MSS. Finally, we critique this approach to online active learning and identify future directions.No Full Tex
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
