Diplommatina nana Blanford 1865

Information from the abstract

23Diplommatina nanaBlanford, 1865 Fig. 18 A – E Diplommatina nana Blanford, 1865: 85. Type locality: Akoutoung, Thondoung and Yenandoung in Henzada district, Pegu. Godwin-Austen 1868: 84, pl. 4, figs 4, 4 a. Theobald and Stoliczka 1872: 331. Hanley and Theobald 1875: 55, pl. 140, fig. 1. Pfeiffer 1875: 75. Theobald 1876: 42. Nevill, 1878: 285. Godwin-Austen 1884: pl. 49, figs 6, 6 a. Godwin-Austen 1886: 181. Gude 1921: 324. Diplommatina (Eudiplommatina) nana — Kobelt and Möllendorff 1898: 137. Diplommatina (Diplommatina) nana — Kobelt 1902: 439. Type material examined. Myanmar • Syntypes. NHMUK 1888.12.4.217 –219 (3 shells; Fig. 18 D, E) from Akouktoung, Pegu; Theobald coll. • Syntypes. NHMUK 1906.4.4.18 a (6 shells; Fig. 18 B) from Akouktoung; W. T. Blanford coll. • Syntypes. NHMUK 1906.4.4.18 (6 shells; Fig. 18 C) from Thondoung, near Mya; W. T. Blanford coll. Other material. Myanmar • NHMUK 1903.7.1.2203 (1 shell; Fig. 18 A) from Burma (figured in Godwin-Austen 1884: pl. 49, figs 6, 6 a); Godwin-Austen coll. Diagnosis. Shell dextral, pupate-fusiform, translucent, and pale yellowish to whitish. Whorls ~ 6, rounded; spire elongate-conical; suture wide, deep. Teleoconch with weak, irregularly spaced radial ribs. Last three whorls nearly equal in width; penultimate whorl slightly wider than others. Aperture ovate; columellaris strong, distinct, directed downward. Peristome double, expanded, multi-layered; inner peristome broadly expanded over outer peristome; lip little thickened, multi-layered. Umbilicus narrowly open. Distribution. The species is currently known from its type locality near the border of the present-day Bago and Ayeyarwady regions. The Akauk Taung Hill (18°30'33.7"N, 95°06'48.5"E) is located in Pyay District, Bago Region, while Thondoung and Yenangdoung likely correspond to the area of Yae Nan Taung Village, south of Akauk Taung Hill, in Hinthada District, Ayeyarwady Region. In addition, the species has been reported from several other localities in Myanmar: Henzada (Hinthada City, Ayeyarwady Region), Thayet Myo (Thayet City, Thayet District, Magway Region), Pegu (Bago Region), Tongoop, Arakan (Taungup Township, Thandwe District, Rakhine State), and near Moulmein (Theobald and Stoliczka 1872; Nevill 1878; Gude 1921). It has also been reported from Meghalaya State, India (Ramakrishna et al. 2010). Remarks. In the original description, Blanford (1865: 85) did not indicate the number of type specimen lots. However, the stated collection locality suggests that the type series comprised at least three lots from distinct collecting sites: ‘ Akoutoung’ (= Akauk Taung), Pyay District, Bago Region; ‘ Thondoung’, a hill south of Akauk Taung, Hinthada District, Ayeyarwady Region; and ‘ Yenandoung’ (= Yae Nan Taung), Hinthada District, Ayeyarwady Region. The NHM collection holds three lots of this species, all originating from W. T. Blanford’s collections: NHMUK 1888.12.4.217 –219 from Akauk Taung, Pegu; NHMUK 1906.4.4.18 a from Akauk Taung; and NHMUK 1906.4.4.18 from Thondoung, near Mya. These three lots constitute the type series and are herein recognised as syntypes. Representative specimens from each syntype lot are also illustrated in this study.

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 · Aquatic Ecosystems and Phytoplankton Dynamics