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4Diplommatina akronPanha & Burch, 1998 Figs 1 D, 3 D, 7 B, 8 Diplommatina akron Panha & Burch, 1998 [1996]: 52–54, fig. 3. Type locality: Doichiang Dao Wildlife Sanctuary, Chiangmai, Thailand. Panha and Burch 2005: 19, fig. 19. BEDO 2017: 75. Jirapatrasilp et al. 2023: 26. Type material examined. Thailand • Holotype. CUMZ 15398 (former Di- 022; Fig. 7 B) from Doichiang Dao Wildlife Sanctuary, Chiang Mai; Panha and Burch coll. • Paratypes. CUMZ 15399 (former Di- 023; 16 shells); same data as for holotype. Other material. Myanmar • CUMZ 15451 (1 shell; Figs 1 D, 8 A) and CUMZ 15452 (1 shell; Figs 3 D, 8 B) from Aye Say Tee Cave, Taunggyi City, Shan State; 20°47'29.5"N, 97°03'01.6"E; P. Tongkerd and S. Panha leg. Description. Shell sinistral, fusiform to nearly conical, relatively large, and ivory white or transparent yellow. Shell height 4.9–5.8 mm; shell width 2.6–3.1 mm. Whorls ~ 7–8, rounded; spire conical; suture wide, deep. Protoconch ~ 1 ¾ whorl, nearly smooth, with weak wrinkles and coalescing round malleated pits. Teleoconch with delicate costae, later becoming stronger, regularly spaced radial ribs; ~ 8–9 ribs / mm on penultimate whorl towards aperture. Spiral striations very weak, restricted to early whorls (seen under SEM). Penultimate whorl slightly wider than last whorl. Constriction externally inconspicuous; internal constriction marked with distinct vertical ridge. Aperture circular, with four barriers: parietalis very strong, prominent, tall ridge; two horizontal palatalis situated beyond constriction – upper palatalis elongate with prominent ridge, and lower palatalis short, prominent ridge; columellaris distinctly prominent ridge, continuous with peristome, and slightly deflected downward toward palatal wall (Fig. 3 D). Peristome broadly expanded, double; outer peristome slightly broader than inner peristome. Lip thickened, multi-layered; parietal callus thickened, expanded. Columella angulate, with sinulus below. Umbilicus closed. Distribution. This species was originally described from northern Thailand and is also currently known from Shan State, Myanmar. In the present surveys, it was recorded from a limestone outcrop in Taunggyi, Shan State, at an elevation of 1,583 m (Fig. 1 A). However, its occurrence in other parts of Shan State cannot be ruled out. Remarks. Although this species shares a sinistral and fusiform shell shape with D. pupaeformis from Shan State, Myanmar, and D. inthanon Panha & Burch, 2001 from Chiang Mai Province, Thailand, several diagnostic characters can be used to differentiate it from these congeners. For comparison, D. akron possesses a fusiform shell with strong, widely spaced radial ribs and a robust, prominent columellaris. In contrast, D. pupaeformis has an almost pupilliform shell, more narrowly spaced radial ribs, and a weaker columellaris. Additionally, D. inthanon (Fig. 7 C) can be distinguished by its fine, thin, and densely arranged radial ribs (Theobald 1870; Panha and Burch 2001, 2005). Living animal pale white in colour, with white tentacles (Fig. 1 D).
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ประเด็นที่เกี่ยวข้อง: Diatoms and Algae Research · Mollusks and Parasites Studies · Aquatic Invertebrate Ecology and Behavior
บทบาทของนักวิจัยและสถาบันไทย
Piyoros Tongkerd · Arthit Pholyotha · Supunya Annate · Chirasak Sutcharit · Chulalongkorn University
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