Diplommatina exserta Godwin-Austen 1886

Information from the abstract

19Diplommatina exsertaGodwin-Austen, 1886 Fig. 17 C Diplommatina exilis var. exserta (nom. nud.) Nevill, 1878: 284. [nomen nudum] Diplommatina exserta Godwin-Austen, 1884: pl. 49, figs 2, 2 a. [nomen nudum] Diplommatina exserta Godwin-Austen, 1886: 184, 185. Type locality: Damotha Cave, Moulmein. Gude 1921: 314. Budha et al. 2017: 8, figs 3 b, 9 b. Diplommatina (Eudiplommatina) exserta — Kobelt and Möllendorff 1898: 136. Diplommatina (Diplommatina) exserta — Kobelt 1902: 432. Budha et al. 2015: 6. Type material examined. Myanmar • Syntypes. NHMUK 1903.7.1.2208 (4 shells; Fig. 17 C) from Damathat, Moulmein (figured in Godwin-Austen 1884: pl. 49, figs 2, 2 a); Godwin-Austen coll. Diagnosis. Shell dextral, turreted-fusiform, translucent, whitish. Whorls ~ 7–8, well rounded; spire elongate-conical; suture wide, deep. Teleoconch with slightly strong, densely and equally spaced radial ribs throughout. Spiral striations very thin and appearing throughout. Penultimate whorl slightly wider than preceding and last whorls. Aperture rounded, little tilted from columellar axis; columellaris very weak. Peristome expanded, double; basal edge slightly sinuous, protruding; outer peristome slightly broader than inner peristome, multi-layered. Umbilicus closed. Distribution. The species is currently known from its type locality in Mon State and was subsequently recorded from Nepal, approximately 1900 km from the type locality (Gude 1921; Budha et al. 2015, 2017). Remarks. This taxon name was first mentioned by Godwin-Austen (1884) solely in a figure caption, accompanied only by the collection locality. This treatment lacked a description, definition, and indication, and thus did not meet the requirements for availability under the ICZN (1999: Art. 12). Godwin-Austen (1886) subsequently published a full description of the taxon, where the name exserta became available. The specimens from Nepal differ slightly from the syntype, having a somewhat narrower penultimate whorl at the lip, a strong columellar tooth, and a more inflated penultimate whorl compared to the preceding whorl. In contrast, the syntype shows a very weak columellar tooth, a narrower penultimate whorl at the lip, and a penultimate whorl nearly equal in swelling to the preceding whorl. These differences suggest that the specimens from Nepal may belong to a distinct species.

Why this record is monitored

This record has an Impact Signal of 75/100 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 · Subterranean biodiversity and taxonomy · Marine Sponges and Natural Products