Alycaeus conformis Fulton, 1902

Pall-Gergely, Barna, Sajan, Sheikh, Tripathy, Basudev, Meng, Kaibaryer, Asami, Takahiro & Ablett, Jonathan D., 2020, Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue, ZooKeys 981, pp. 1-220 : 1

Alycaeus conformis Fulton, 1902 Fig. 2C

Alycaeus conformis Fulton, 1902: 68-69.

Alycaeus conformis - Venmans 1956: 81-82, figs 1, 2 (radula, see Results on radula); Páll-Gergely et al. 2016: fig. 2.; Foon and Liew 2017: 30-33, figs 7E, 14, 31D.

Type locality.

“Perak”.

Material examined.

Perak, NHMUK 1902.5.28.22-23 (2 syntypes); Thailand, Phuket Island, Khao Phra Thaeo Non-hunting Area, Bangpae waterfall, 8°2'6.09"N, 98°23'12.68"E, leg. B. Páll-Gergely & G. Majoros, July 2010, HNHM 99714 (6 shells examined by Páll-Gergely et al. 2016); NHMW 111541 (10 shells, ex NHMW 36649).

Remarks.

Protoconch with oblique ribs; R1 densely, finely, regularly ribbed with some very weak spiral striation; R2 very long, with dark and light stripes, the lighter being slightly narrower and more elevated from the surface.

Alycaeus conformis and A. gibbosulus have a characteristic, oblique striation on the protoconch (Fig. 2 ). However, the protoconch of A. rolfbrandti is also strongly sculptured (mamillated), and at the end of the protoconch oblique striae can be seen. Therefore, there is a continuous transition from the smooth Alycaeus -type protoconch sculpture to that of A. conformis and A. gibbosulus . Due to the similarity in protoconch sculpture and the geographic proximity (they are also found in mixed museum samples), A. conformis and A. gibbosulus are presumably closely related.

Figures

Figure 2. Protoconch sculpture of Alycaeus Gray, 1850 species A Alycaeus eydouxi Venmans, 1956 (Cochinchina, coll. V. W. MacAndrew, NHMUK) B Alycaeus rolfbrandti Maassen, 2006 (MNHN-IM- 2012 - 27321) C Alycaeus conformis Fulton, 1902 (HNHM 99714, spec 3). Scale bars: 1 mm. All images: Barna Pall-Gergely.