Georissa kohsichangensis Klongkaew, Poeaim & Dumrongrojwattana, 2024
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publication ID |
https://doi.org/ 10.3897/zse.100.128717 |
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publication LSID |
lsid:zoobank.org:pub:FD4C02D2-01F9-4A4C-817B-F81B27F22A41 |
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DOI |
https://doi.org/10.5281/zenodo.13891561 |
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persistent identifier |
https://treatment.plazi.org/id/77F45669-50F9-4FCF-991F-BFC63C7327E7 |
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taxon LSID |
lsid:zoobank.org:act:77F45669-50F9-4FCF-991F-BFC63C7327E7 |
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treatment provided by |
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scientific name |
Georissa kohsichangensis Klongkaew, Poeaim & Dumrongrojwattana |
| status |
sp. nov. |
Georissa kohsichangensis Klongkaew, Poeaim & Dumrongrojwattana sp. nov.
Figs 2 B View Figure 2 , 4 E – H View Figure 4 , 5 E – H View Figure 5
Type material.
Holotype • ZRCBUU 0902 (Fig. 2 B View Figure 2 ). SH = 2.10 mm, SW = 1.43 mm, AH = 0.63 mm, AW = 0.90 mm, W = 4.25–4.5 GoogleMaps . Paratype • ZRCBUU 0903 (Fig. 4 E – H View Figure 4 ) (12 shells); Shell measurements: SH = 1.72–2.03 mm (1.86 ± 0.10 mm), SW = 1.21–1.42 mm (1.30 ± 0.07 mm), AH = 0.51–0.72 mm (0.62 ± 0.05 mm), AW = 0.75–0.84 mm (0.79 ± 0.03 mm), W = 3.75–4.5 GoogleMaps (all type material from type locality; 30 October 2021, P. Dumrongrojwattana leg).
Type locality.
Thailand, Yai Man cave GoogleMaps , Koh Sichang district, Chonburi Province; 13 ° 09 ' 08.2 " N, 100 ° 48 ' 28.0 " E.
Etymology.
This specific designation “ kohsichangensis ” is a district referring to the type locality.
Diagnosis.
Shell minute, ovately conical and the upper half part of the whorls is slightly downward, orangish to brownish, protoconch round to slightly ellipsoid and perforated sculpture. Body whorl with 6–7 spiral lirae. Aperture rhombate. Umbilicus closed. Operculum corneous with apophysis, paucispiral, opaque white, and rhombate.
Description.
Shell minute, dextral, orangish to brownish, ovately conical with 4.25–4.5 whorls (Fig. 2 B View Figure 2 ). Protoconch orange, about one whorl, round to slightly ellipsoid, covered with perforated sculpture (Fig. 4 F, G View Figure 4 ). Teleconch orange 3.25–3.5 whorls. The upper half part of the body whorls is slightly downward, sculptured with only strong oblique growth lines, 6–7 prominent lirae, weak oblique growth lines present on the half lower part of the body whorls, more densely spaced spiral cords, ca. 6–8 cords, at the basal part of the body whorl (Fig. 2 B View Figure 2 , 4 E View Figure 4 ). Suture incised. Aperture rhombate. Peristome thin, sharp, unexpanded or thickened, not reflected. Umbilicus closed. Operculum paucispiral, nucleus submarginal, corneous, opaque white, rhombate shape, thin, smooth outside surface with apophysis, inside surface with an arched peg arising from base (Fig. 4 H View Figure 4 ).
Radula.
Ribbon-like, slender, longer and delicate towards the outside, rhipidoglossate (Fig. 5 E – H View Figure 5 ). Central tooth five small teeth, trapezoid shape. Lateral teeth five teeth, claw-like with 7–11 alternately long and short denticles decreasing in size from the first lateral tooth toward the 5 th lateral tooth. Marginal teeth two teeth, claw-like with 14–18 equal size denticles. Radula formula 2: 5: 1 + 1 + 1 + 1 + 1 + 1: 5: 2.
Differential diagnosis.
Georissa kohsichangensis sp. nov. resembles G. carinata Sutcharit & Jirapatrasilp, 2020 from Cambodia. Georissa carinata differs in having more convex body whorl, a smooth protoconch, and sculptured with thin and uneven growth lines.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Neritimorpha |
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