Diplommatina butleri Godwin-Austen 1892

Information from the abstract

13Diplommatina butleriGodwin-Austen, 1892 Fig. 15 G Diplommatina butleri Godwin-Austin, 1892: 512, 513. Type locality: Laisen Peak, Munipur. Godwin-Austin 1897: 6, 7, pl. 64, fig. 9. Gude 1921: 305, 306. McGhie 2008: 9. Diplommatina (Eudiplommatina) butleri — Kobelt and Möllendorff 1898: 135. Diplommatina (Diplommatina) butleri — Kobelt 1902: 427. Type material examined. India • Syntypes. NHMUK 1903.7.1.2128 (6 shells; Fig. 15 G) from Laisen Peak (Trig. Station), Munipur (figured in Godwin-Austen 1897: pl. 64, fig. 9); Godwin-Austen coll. Diagnosis. Shell dextral, ovate-fusiform, translucent, pale brownish. Whorls ~ 7–8, well rounded; spire elevated conical; suture wide, shallow. Teleoconch: earlier whorls with weak, widely, and equally spaced radial ribs; penultimate whorl and last whorl generally smooth. Penultimate whorl convex, equal in width to last whorl. Aperture circular; columellaris very strong, directed downward. Peristome expanded, double, multi-layered; outer peristome slightly broader than inner peristome. Columella angulate, with distinct sinulus below. Umbilicus closed. Distribution. This species was originally known from its type locality at Laiven Peak, Manipur State, India. It has also been recorded from several other localities, including the Lahupa-Naga Hills, Kezakenomih, and Klang Sing in the Naga Hills, India (Godwin-Austen 1892; Gude 1921). The record from Myanmar, however, lacks a precise locality and is cited only as ‘ Kyengdwen, Burmah’, which likely refers to the Chindwin River valley in Sagaing Region, Myanmar. Remarks. Three syntypes are also housed in the Manchester Museum, The University of Manchester (EE. 3511 / 109) (McGhie 2008). This species closely resembles D. ambigua in shell form but differs in having widely and regularly spaced radial ribs on the earlier whorls, and the penultimate and last whorls are generally smooth. In contrast, D. ambigua (Fig. 15 B) possesses narrowly and regularly spaced radial ribs on the earlier whorls, and the penultimate and last whorls bear widely spaced ribs.

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