Diplommatina richthofeni Theobald & Stoliczka 1872

Information from the abstract

3Diplommatina richthofeniTheobald & Stoliczka, 1872 Figs 3 C, 6, 7 A Diplommatina richthofeni Theobald & Stoliczka, 1872: 331, 332, pl. 11, fig. 4. Type locality: Prope Moulmain [Mawlamyine, Myanmar]. Pfeiffer 1875: 78, 79. Hanley and Theobald 1876: 56, pl. 141, figs 7, 8. Theobald 1876: 42. Nevill 1878: 285. Gude 1921: 331. Diplommatina (Eudiplommatina) richthofeni — Kobelt and Möllendorff 1898: 137. Diplommatina (Diplommatina) richthofeni — Kobelt 1902: 443. Type material examined. Myanmar • Holotype. NHMUK 1888.12.4.162 (Fig. 7 A) from Moulmein; Theobald coll. Other material. Myanmar • CUMZ 15448 (1 shell; Fig. 6 A), CUMZ 15449 (1 shell; Figs 3 C, 6 B) and CUMZ 15450 (85 shells) from Naga Mauk Cave, Mawlamyine City, Mon State; 16°18'58.4"N, 97°42'23.0"E; P. Tongkerd and S. Panha leg. Description. Shell small, dextral, spindle-shaped, pale whitish to pale yellowish. Shell height 2.1–2.5 mm; shell width 0.8–1.1 mm. Whorls ~ 6, slightly angular-rounded; spire conical; suture wide and deep. Protoconch ~ 1 ¾ whorl, with prominent round malleated pits throughout. Teleoconch with strong, irregularly spaced, and sinuous radial ribs; ~ 10–11 ribs / 0.5 mm on penultimate whorl, ~ 8–9 ribs / 0.5 mm on last whorl towards aperture. Spiral striations very fine, appearing throughout from teleoconch to last whorl near aperture. Penultimate whorl slightly wider than last whorl. Constriction externally inconspicuous; internal constriction marked with low vertical ridge. Aperture circular, with two barriers: parietalis weak, low ridge; palatalis absent; columellaris prominent ridge, continuous with peristome, and slightly deflected downward toward palatal wall (Fig. 3 C). Peristome expanded; outer peristome broader than inner peristome. Lip multi-layered; parietal callus thin, expanded. Columella short and curved. Umbilicus sealed. Distribution. This species is currently known only from Naga Mauk Cave, Mawlamyine City, Mon State, Myanmar (Fig. 1 A). The original locality was recorded as ‘ Moulmain’. Remarks. Theobald and Stoliczka (1872) clearly stated in the original description that only a single specimen was obtained from Farm Caves.

Why this record is monitored

This record has an Impact Signal of 70/100 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 · Mollusks and Parasites Studies · Paleontology and Stratigraphy of Fossils