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| Formaat: | Recurso digital |
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Zenodo
2021
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| Online toegang: | https://doi.org/10.5281/zenodo.4771730 |
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- <p><b><i>Chamalycaeus buaboke</i> Páll-Gergely & A. Reischütz n. sp.</b></p><p>Figs 1A, 2</p><p><b>Material examined.</b> <b>Holotype:</b> Thailand, Surat Thani Province, Ang Thong Islands, Wua Talap Island, ascent to Buaboke Cave, 9°37.993’N, 99°40.369’E, ca. 50 m a.s.l. (locality code: Th1), Sep. 2007, A. Reischütz leg., at base of limestone rocks, NHMW 113484 (D: 2.03 mm, H: 1.23 mm). <b>Paratype:</b> 1 shell, same data as holotype, RE.</p><p><b>Etymology.</b> The specific epithet (noun used in apposition) derives from the name of the cave where the new species was collected.</p><p><b>Diagnosis.</b> A tiny <i>Chamalycaeus</i> species with finely ribbed R1, elevated, narrow swelling on R3, and great distance between inner and outer peristomes.</p><p><b>Description.</b> Shell off-white, probably somewhat translucent when fresh; shell outline oval in dorsal view; spire slightly elevated, low conical; body whorl rounded; protoconch low, finely granular, spiral striae lacking, 1.25–1.5 whorls; R1 of 1.25–1.5 whorls, with strong, elevated, slim, densely, regularly arranged ribs, fine spiral striation between ribs; boundary between R1 and R2 distinct due to change of rib density; R2 ribs slightly curved towards aperture, spaces between ribs approximately as wide or slightly wider than ribs; ca. 26 ribs present; R2+R3 less than quarter whorl (ca. 80˚), R2 somewhat shorter than R3; boundary between R2 and R3 distinct due to deep constriction and ribless posterior portion of R3; R3 with short, narrow, ribbed central swelling; anterior slope of swelling steeper than posterior slope; aperture oblique to shell axis, rounded with small basal incision; boundary between inner and outer peristomes conspicuous, inner peristome strongly thickened, protruding, and slightly expanded; outer peristome thin, strongly expanded, distinctly reflected portion over umbilicus; distance between inner and outer peristomes significant, swelling of R3 and edge of outer peristome closely situated; umbilicus relatively narrow, ca. one fourth of shell width.</p><p><b>Measurements.</b> D: 2.03–2.29 mm, H: 1.23–1.33 mm.</p><p><b>Operculum.</b> Unknown.</p><p><b>Differential diagnosis.</b> The most similar species is <i>Chamalycaeus canaliculatus</i> (Möllendorff, 1894) (examined material: Golf von Siam: Koh-Samui, coll. Möllendorff, SMF 109468, lectotype, Fig. 1B), which was described from the nearby island, Koh Samui. The new species from Wua Talap Island is slightly smaller (<i>C. canaliculatus</i> D: 2.4 mm), has a more elevated R3, and much greater distance between the inner and outer peristomes.</p><p>The new species differs from <i>Dicharax ovatus</i> n. sp. by the slightly smaller size, lower spire, very rounded body whorl and aperture, blunt swelling on R3, and the shorter distance between the inner and outer peristomes.</p><p><b>Distribution.</b> This new species is known only from the type locality (Fig. 3).</p>