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| Format: | Recurso digital |
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Zenodo
2025
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| Online adgang: | https://doi.org/10.5281/zenodo.17864704 |
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- <p><b><i>Cycloryx rohiniae</i> Páll-Gergely & Aravind sp. nov.</b></p><p>urn:lsid:zoobank.org:act: 80122B22-6AEE-4698-8E7A-62068B3CAE76</p><p>Fig. 27A–E</p><p><b>Diagnosis</b></p><p>A large species of <i>Cycloryx</i> with smooth R3.</p><p><b>Etymology</b></p><p>The new species is named after Ms Rohini Nilekani, author, environmentalist and acclaimed philanthropist.</p><p><b>Type material examined</b></p><p><b>Holotype</b></p><p>INDIA – <b>Mizoram</b> • empty shell (D: 3.7 mm, H: 4.1 mm, Fig. 27A–E); Blue Mountain, Lawngtlai district; 22.727° N, 93.135° E; 1400 m a.s.l.; 27 Jan. 2019; N.A. Aravind leg.; Ar37; NZSI LM1717.</p><p><b>Paratype</b></p><p>INDIA – <b>Mizoram</b> • 1 empty shell; same data as for holotype; Ar34; NZSI LM1718 • 1 empty shell; same data as for holotype; Ar35; NZSI LM1719.</p><p><b>Description</b></p><p>Shell large for the genus, all available shells slightly corroded, original colour may be greenish-yellowish, semitranslucent; shell conical or conical-globular, height and width approximately equivalent; body whorl rounded; protoconch smooth, glossy, consisting of 1.5 or slightly fewer whorls; R1 of ca 2–2.25 whorls, regularly ribbed, rib density gradually decreases towards end of R2 (last half whorl with ca 16 ribs); ribs thread-like, low; fine, dense spiral striation discernible between ribs; boundary between R1 and R2 not conspicuous, but clearly visible due to increase in rib density (R2 ribs twice as dense as ribs at the end of R1); R2 practically smooth, its “ribs” (6–7 in number) are not elevated from the surface, represented as slender, light stripes; sutural tube short, cylindrical; R2+R3 ca quarter whorl, R3 ca 3 times as long as R2; boundary between R2 and R3 clearly visible due to a shallow constriction; R3 with a low central, long swelling, smooth, only fine growth lines visible but no ribs; aperture slightly oblique to shell axis, rounded; inner and outer peristomes clearly separated; inner peristome slightly protruding and expanded; outer peristome strongly expanded, sharp, and reflected in direction of umbilicus; umbilicus open, narrow, the reflected outer peristome curves into umbilicus, terminating at its centre.</p><p>OPERCULUM. A single operculum of the Ar35 shells was examined. The inner side is smooth, without central swelling, outer side multispiral, without elevated lamina.</p><p>MEASUREMENTS. D: 3.7 mm, H: 3.5–4.1 mm.</p><p><b>Distribution</b></p><p>Known only from the Blue Mountain region.</p><p><b>Differential diagnosis</b></p><p>The only species with similar size and lack of R3 ribs is <i>C. otiphorus</i>, which has a more pointed (more triangular) shell, and has denser ribs on the apical part. <i>Cycloryx dihingensis</i>, which is similar in shell shape, has strong R3 ribs. All these species inhabit Assam, which geographically is distant from Mizoram.</p>