Pagodapalaina suratensis

Information from the abstract

8Pagodapalaina suratensis(Panha & Burch, 1998) Figs 7 E, 11 D, 14 Diplommatina suratensis Panha & Burch, 1998: 57, fig. 5. Type locality: Klongsang Wildlife Sanctuary, Surathani Province, Thailand. Panha and Burch 2005: 33, fig. 35. BEDO 2017: 83. Jirapatrasilp et al. 2023: 26. Pagodapalaina suratensis — Chen et al. 2025: 398, 399, fig. 3 h. Type material examined. Thailand • Holotype. CUMZ 15370 (former Di 028; Fig. 7 E) from Klongsang Wildlife Sanctuary, Surathani Province; Panha and Burch coll. • Paratypes. CUMZ 15371 (former Di 029; 7 shells); same data as for holotype. Other material. Myanmar • CUMZ 15463 (1 shell; Fig. 14 A), CUMZ 15464 (1 shell; Figs 11 D, 14 B), CUMZ 15465 (327 shells + 6 juveniles) from Buddha Cave, Lenya City, Tanintharyi Region; 11°13'46.2"N, 99°10'34.3"E; C. Sutcharit, R. Chanabun and R. Srisonchai leg. Description. Shell sinistral, turreted-fusiform, reddish to yellowish. Shell height 1.9–2.2 mm; shell width 0.9–1.2 mm. Whorls ~ 7, earlier whorls rounded, last three whorls angular; spire elongate conical; suture wide and very deep. Protoconch ~ 1 ½ whorls, with roundish malleated pits throughout. Teleoconch with strong, regularly spaced radial ribs; earlier whorls ribs regularly strong, last three whorls’ ribs slightly elevated, weakly sinuous at angulation, and then thinner and lower near suture. Ribs with 6–7 ribs / 0.5 mm on penultimate whorl; 10–11 ribs / 0.5 mm on last whorl towards aperture. Spiral striations very thin and fine, appearing from teleoconch to aperture. Last whorl narrower than penultimate whorl and displaced rightward relative to peristome position. Constriction inconspicuous externally and internally. Aperture circular bearing, with three barriers: parietalis short, very weak, low knob-like; palatalis elongate horizontally and form tall ridge; columellaris prominent, continuous with peristome, slightly deflected downward toward palatal wall (Fig. 11 D). Peristome broadly expanded, double; outer peristome broader than inner peristome. Lip thickened, multi-layered; parietal callus thickened and expanded. Columella straight, thickened. Umbilicus closed. Distribution. Pagodapalaina suratensis occurs in several areas of southern Thailand (Panha and Burch 2005). It has recently been recorded from limestone outcrops in the Tanintharyi Region, southern Myanmar (Fig. 1 A). Remarks. This is the first record of this species in Myanmar. Diplommatina somsakpanhai sp. nov. was also found syntopic with this species. The new species differs in having opposite shell coiling, an ovate shell shape, and a very large, thickened shell aperture.

Why this record is monitored

This record has an Impact Signal of 73/100 based on recency, source, collaboration, and bibliographic signals. It prioritizes monitoring and is not a judgment of research quality.

Related topics: Diatoms and Algae Research · Aquatic Invertebrate Ecology and Behavior · Marine Bivalve and Aquaculture Studies