Diplommatina tumida subsp. laisenensis Gude 1921

Information from the abstract

31Diplommatina tumida laisenensisGude, 1921 Fig. 20 E Diplommatina tumida var. Godwin-Austen, 1892: 512. Type locality: Laisen Peak and Trigonometrical Station, Munipur. Godwin-Austen 1897: 7, 8, pl. 64, fig. 7. Diplommatina tumida var. laisenensis Gude, 1921: 338. Type locality: Burma: Laisen Peak and Nongmaiching Trigonometrical Station, Munipur. Type material examined. India • Syntypes. NHMUK 1903.7.1.2139 (5 shells) labelled as D. tumida var. from Laisen H. S. Munipur; Godwin-Austen coll. • Syntypes. NHMUK 1903.7.1.2136 (2 shells; Fig. 20 E) labelled as D. tumida small var. from Nongmaiching, Munipur (figured in Godwin-Austen 1897: pl. 64, fig. 7); Godwin-Austen coll. Diagnosis. Shell dextral, ovate-fusiform, dull, whitish. Whorls ~ 7, well rounded; spire elevated conical; suture wide, shallow. Teleoconch: earlier whorls with weak, narrowly and equally spaced radial ribs; penultimate and last whorls with slightly wider-spaced radial ribs to nearly smooth. Penultimate whorl convex, wider than last whorl. Aperture circular; columellaris strong, directed downward. Peristome expanded, double, multi-layered; outer peristome slightly broader than inner peristome; parietal callus expanded. Columella straight; umbilicus closed. Distribution. This species is known from its type localities at Laisen Peak and the Trigonometrical Station in Manipur State, India. Records from Myanmar, however, lack precise locality data (Gude 1921), and the presence there has not yet been reconfirmed. Remarks. This subspecies was originally described in detail by Godwin-Austen (1892) under the designation ‘ var. ’ and later illustrated by Godwin-Austen (1897), although no formal name was proposed at that time. Gude (1921) subsequently republished the original description and introduced ‘ laisenensis ’ as a nomen novum, which has been made available. The type series of this subspecies corresponds to the specimens referred to as ‘ var. ’ and the ‘ illustrated specimen’ by Godwin-Austen (1892, 1897) from Lisein Peak and the Nongmaiching Trigonometrical Station, Munipur. The NHM, London, holds two specimen lots considered syntypes: one containing five shells labelled ‘ Diplommatina tumida var. from Laisen H. S., Munipur’, and another containing two shells labelled ‘ Diplommatina tumida small var. from Nongmaiching, Manipur’.

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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 Ecosystems and Phytoplankton Dynamics · Aquatic Invertebrate Ecology and Behavior