Diplommatina crispata Stoliczka 1871

Information from the abstract

16Diplommatina crispataStoliczka, 1871 Fig. 16 D Diplommatina (Palaina) crispata Stoliczka, 1871: 153, pl. 6, fig. 4. Type locality: Damotha, prope Moulmein. Pfeiffer 1875: 91, 92. Nevill 1878: 289. Gude 1921: 308, 309. Palaina crispata — Theobald 1876: 43. Diplommatina crispata — Hanley and Theobald 1876: 56, pl. 141, fig. 6. Godwin-Austen 1884: pl. 49, figs 4, 4 a, 4 b. Godwin-Austen 1886: 183. Diplommatina (Eudiplommatina) crispata — Kobelt and Möllendorff 1898: 136. Diplommatina (Diplommatina) crispata — Kobelt 1902: 429. Type material examined. Myanmar • Syntypes. NHMUK 1903.7.1.2200 (2 shells; Fig. 16 D) from Moulmein, Tenasserim (figured in Godwin-Austen 1884: pl. 49, figs 4, 4 a); Godwin-Austen coll. Diagnosis. Shell dextral, elongate-fusiform, dull, and pale brownish to pale yellowish. Whorls ~ 6–7; earlier whorls rounded-angular then becoming stronger on last two whorls; spire elongate-conical; suture wide, deep. Teleoconch with equally spaced radial ribs throughout: earlier whorls regular, strong radial ribs; last two whorls with strong, tall, sinuous radial ribs at angulation. Spiral striations fine, conspicuously present on last two whorls. Penultimate whorl much wider than last whorl; last whorl much displaced to right relative to peristome position. Aperture rounded; columellaris distinct, directed downward. Peristome expanded, double; outer peristome more broadly expanded than inner peristome, multi-layered; inner peristome slightly expanded, elevated. Umbilicus very narrow. Distribution. The species is currently known only from its type locality, ‘ Damotha, near Moulmein’, which corresponds to the modern Damathat Cave (16°30'21.8"N, 97°49'11.5"E) in Mawlamyine, Mon State, Myanmar. Remarks. Diplommatina angulifera Bavay & Dautzenberg, 1912 from Vietnam and D. angulifera umpangensis Panha, 1998 from Thailand exhibit shell shapes and sculptures similar to those of D. crispata, and they are likely conspecific. Additionally, D. crispata khaochamaoensis Panha, Kanchanasaka & Burch, 2002 from Chanthaburi Province, Thailand which is located approximately 600 km southeast of the type locality, differs slightly from the nominotypical subspecies. It possesses a less prominent angulation on the last whorl, whereas the nominotypical subspecies exhibits a more pronounced and sharply defined peripheral keel on the penultimate whorl that expands to nearly the same extent as that of the last whorl.

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 · Aquatic Invertebrate Ecology and Behavior · Aquatic Ecosystems and Phytoplankton Dynamics