Georissa sagitta 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.13891563 |
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persistent identifier |
https://treatment.plazi.org/id/965F36E8-E123-496F-A43D-9C2D1B80294F |
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taxon LSID |
lsid:zoobank.org:act:965F36E8-E123-496F-A43D-9C2D1B80294F |
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treatment provided by |
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scientific name |
Georissa sagitta Klongkaew, Poeaim & Dumrongrojwattana |
| status |
sp. nov. |
Georissa sagitta Klongkaew, Poeaim & Dumrongrojwattana sp. nov.
Figs 2 C View Figure 2 , 4 I – L View Figure 4 , 5 I – L View Figure 5
Type examined.
Holotype • ZRCBUU 0904 (Fig. 2 C View Figure 2 ); SH = 2.61 mm, SW = 1.63 mm, AH = 0.79 mm, AW = 0.98 mm, W = 4.25–4.5 GoogleMaps . Paratypes • ZRCBUU 0905 (Fig. 4 I – L View Figure 4 ) (10 shells); Shell measurements: SH = 2.44–2.88 mm (2.65 ± 0.14 mm), SW = 1.63–1.84 mm (1.70 ± 0.07 mm), AH = 0.79–0.97 mm (0.87 ± 0.05 mm), AW = 0.95–1.09 mm (1.00 ± 0.04 mm), W = 4–4.5 GoogleMaps (all type material from type locality; 20 July 2019, P. Dumrongrojwattana leg).
Type locality.
Thailand, Khao Maka Cave Temple GoogleMaps , Mueang Sakaeo district, Sakaeo Province; 13 ° 47 ' 16.6 " N, 101 ° 56 ' 53.7 " E.
Etymology.
The specific designation “ sagitta ” for the prominent oval indentation resembling a target in archery.
Diagnosis.
Shell minute, ovately conical, orangish, protoconch round to slightly ellipsoid and mix of rounded, ellipsoidal to irregular sculpture with oval indentation. Body whorl peripherally rounded with 8–9 spiral lirae. Aperture semi-rounded. Umbilicus closed. Operculum corneous with apophysis, paucispiral, opaque white, and semi-rounded.
Description.
Shell minute, dextral, orangish to brownish, ovately conical with 4.25–4.5 whorls (Fig. 2 C View Figure 2 ). Protoconch orange consists of 1 whorl, round to slightly ellipsoid, covered with mix of rounded, ellipsoidal to irregular sculpture and a large oval indentation present (Figs 4 J View Figure 4 , 4 K View Figure 4 ). Teleconch orange, consists of 3.25–3.5 whorls. Peripherally rounded, sculptured with 8–9 prominent lirae on the body whorl, crossed with weak oblique growth lines. Basal part of the body whorl, there are more densely spaced spiral cords, approximately 7–8 cords (Figs 2 C View Figure 2 , 4 I View Figure 4 ). Suture incised. Aperture semi-rounded. Peristome thin, sharp, unexpanded or thickened, not reflected. Umbilicus closed. Operculum paucispiral, nucleus submarginal, corneous, opaque white, semi-rounded, thin, smooth outside surface with apophysis, inside surface with an arched peg arising from base (Fig. 4 L View Figure 4 ).
Radula.
Ribbon-like, slender, longer and delicate towards the outside, rhipidoglossate (Fig. 5 I – L View Figure 5 ). Central tooth five small teeth, trapezoid shape. Lateral teeth five teeth, claw-like with 7–13 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 12–14 equal size denticles. Radula formula 2: 5: 1 + 1 + 1 + 1 + 1 + 1: 5: 2.
Differential diagnosis.
Georissa sagitta sp. nov. resembles G. monterosatiana Godwin-Austen & Neville, 1879 . Georissa monterosatiana differs in having more convex body whorl, smooth protoconch, and more lirae (9–11 instead of 8–9 lirae).
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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