Alycaeus eydouxi Venmans, 1956

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 eydouxi Venmans, 1956 Figs 2A , 6A , 8

Cyclostoma gibbum Eydoux, 1838: 6, pl. 117, fig 1. (non Cyclostoma gibbum Draparnaud, 1805)

Alycaeus gibbus - Reeve 1878: pl. 1, species 3.

Alycaeus (Alycaeus) gibbus - Kobelt 1902: 344-345.

Alycaeus (Orthalycaeus) gibbus - Godwin-Austen 1914: 427, pl. 156, figs 5, 5a.

Alycaeus eydouxi Venmans, 1956: 87, figs 6, 7 (radula). (nom. nov. pro Cyclostoma gibbum Eydoux, 1838, non Cyclostoma gibbum Draparnaud, 1805)

Alycaeus eydouxi - Egorov 2013: fig. 58a; Páll-Gergely et al. 2017: 9-10, fig. 3A.

Type locality.

"que dans les grottes formées dans l’intérieur des montagnes de marbre qui s’élèvent au milieu de la plaine oú est bâtie la ville de Turanne, en Cochinchine".

Material examined.

Annam, Touranne, leg. Frühstorfer, coll. Möllendorff, SMF 109290 (5 shells); Same data, NHMW 43182 (4 shells); Cochinchina, coll. V.W. MacAndrew, NHMUK.

Remarks.

Protoconch matte, without spiral lines; R1 fine, dense, rather regular ribs with weak spiral striation; R2 long, with dense, lamellae-like, elevated ribs, which are most elevated closer to the suture. Below the ribs, the microtunnels are visible as narrow light bands between the darker, thicker stripes (visible where there are weathered areas of the shell).

Habe (1965) reported " Dioryx gibbus (Reeve)" from "Kao Phlong, north or Sara Buri, Central Thailand", without publishing a picture. This almost certainly refers to a different species.

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.

Figure 6. Type species of alycaeid genus-group taxa A Alycaeus eydouxi Venmans, 1956 (SMF 109290; type species of Alycaeus) B Chamalycaeus fruhstorferi (Moellendorff, 1897), lectotype (SMF 109481; type species of Chamalycaeus). Photographs: Barna Pall-Gergely (A) and Frank Walther (B).

Figure 8. Living specimens of Alycaeus eydouxi Venmans, 1856. Th ủy Sơn (Water Mountain), Ngũ Hanh Sơn (Five Elements or Marble Mountains), Da Nang. 16 ° 0.254 ' N, 108 ° 15.756 ' E. Photograph: Junn Kitt Foon.