Alycaeus rolfbrandti Maassen, 2006

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 rolfbrandti Maassen, 2006 Fig. 2B

Alycaeus rolfbrandti Maassen, 2006: 136-137, figs 6-9.

Alycaeus rolfbrandti - Páll-Gergely et al. 2017: 10, fig. 3B; Inkhavilay et al. 2019: 13, fig. 3F.

Type locality.

"Laos, limestone Hills 20 km E of Takek".

Material examined.

Laos, Kalkberge ca. 20 km östl. Takek, leg. Brandt 08.09.1963, SMF 262541 (1 shell; labelled as the holotype of " Alycaeus carinatus Brandt", but not mentioned by Maassen 2006); locality data as above, SMF 262541 (5 shells, labelled as paratypes of " Alycaeus carinatus Brandt", but not mentioned in Maassen 2006); South-Central Laos, Khammouan Province, ca. 9 km NE of Thakhek (Muang Khammouan), NW exposition cliff, limestone, clay, black soil in limestone pockets, on and under rocks in dry secondary forest on and under, alt. 190 m, 17°26.757'N, 104°52.937'E, leg. Abdou, A. & Muratov, I.V., 27.11.2007., MNHN-IM-2012-27321 (19 complete shells + some shell fragments).

Remarks.

Protoconch irregularly ribbed, squamous, the last ca. 0.25 whorl with oblique ribs similar to those of A. conformis and A. gibbosulus ; R1 with regular, fine, low ribs without spiral striae; R2 long with dense, lamella-like ribs (very similar to those of A. eydouxi ).

The shells in the Senckenberg Museum are part of the original series of the species collected by Brandt, but since Maassen did not state that he examined them, they are not part of the type series.

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.