Dicharax ataranensis (Godwin-Austen, 1914)

Páll-Gergely, Barna, Hunyadi, András, Grego, Jozef, Reischütz, Alexander & Auffenberg, Kurt, 2021, Nineteen new species of Alycaeidae from Myanmar and Thailand (Gastropoda: Caenogastropoda: Cyclophoroidea), Zootaxa 4973 (1), pp. 1-61 : 25-26

Dicharax ataranensis (Godwin-Austen, 1914)

Fig. 18

Alycaeus ataranensis Godwin-Austen, 1914: 426 , plate 148, figs 4, 4a–b.

Alycaeus (Dicharax) ataranensis — Gude 1921: 237.

Dicharax ataranensis — Páll-Gergely et al. 2020: 77 , fig. 18.

Material examined. Holotype: Myanmar, Ataran, Burma, ex Dr. F. Stoliczka, NZSI M.8073 (holotype [single specimen mentioned in original description]) . Other material: 1 shell, Myanmar, Kayin State, Mudon centre ESE ca. 51 km, Htimahto NE, NE point of Kwooprai Hill , 16°2.396’N, 97°58.200’E, 30 m a.s.l. (locality code: 2018/47), 10 Oct. 2018, A. Hunyadi, K. Okubo & J.U. Otani leg., HA .

Type locality. “1 Ataran”.

Diagnosis (emended based on a newly collected specimen). Protoconch relatively low, glossy, without spiral striation; R1 glossy, widely-spaced ribs near the suture and inside the umbilicus, edge of R1 smooth; R2+R3 over a quarter whorl long, R2 ca. half as long as R3; R2 ribs typical for Dicharax (curved towards the aperture); R3 smooth, with blunt, but large, conspicuous, elevated swelling.

Remarks. Until recently the eroded holotype was the only known specimen of the species making the assignment to Dicharax questionable. The newly collected fresh shell allowed examination of shell sculpture which confirmed the assignment.

Figures

FIGURE 18. Dicharax ataranensis (Godwin-Austen, 1914). Myanmar, Kayin State, Mudon centre ESE ca. 51 km, Htimahto NE, NE point of Kwooprai Hill, 30 m a.s.l. 16°2.396’N, 97°58.200’E (locality code: 2018/47), leg. A. Hunyadi, K. Okubo & J.U. Otani, 10 Oct. 2018, HA.