Opisthoporus grohi (Thach, 2020)

Tongkerd, Piyoros, Tumpeesuwan, Sakboworn, Inkhavilay, Khamla, Prasankok, Pongpun, Jeratthitikul, Ekgachai, Panha, Somsak & Sutcharit, Chirasak, 2023, Systematic revision of the snorkel snail genus Rhiostoma Benson, 1860 (Gastropoda, Caenogastropoda, Cyclophoridae) with descriptions of new species, ZooKeys 1142, pp. 1-144 : 1

Opisthoporus grohi (Thach, 2020)

Fig. 57F

Rhiostoma grohi Thach, 2020: 18, 19, figs 155, 156. Type locality: Krong No District, Dak Nong Province, Central Vietnam.

Type material.

Holotype MNHN-IM-2000-35507 (Fig. 57F ) from Krông Nô District, Dàk Nông Province.

Remarks.

This species description was based on the holotype and two paratypes housed in the Thatch’s collection. The holotype is probably a young or not fully-grown specimen because of the slightly thin and sharp apertural lip. A short detached whorl and short breathing tube located away from the apertural lip are observed in the holotype. The operculum accompanying the type series (see Thach 2020: fig. 156) and the statement in the original description "exteriorly whitish with many concentric layers" seem to indicate a plate-shaped operculum. These are the diagnostic characters, and therefore, we have relocated this species into the genus Opisthoporus .

Figures

Figure 57. A Pterocyclos subalatus Sykes, 1903, holotype UMZC 1032 from Gunong Inas, Perak, Malay Peninsula B Pterocyclos spelaeotes (Tomlin, 1931), lectotype NMW 1955.158.01107 from Batu Cave, Kula Lumpur, Selangor C Pterocyclos umbraticus (Benthem Jutting, 1949), holotype ZMA 135622 from Maxwell's Hill, Perak, Malaysia D Cyclotus boxalli syntype NHMUK 1894.5.23.1 from Kina Balu E Opisthoporus battambangensis holotype MNHN-IM- 2000 - 35506 from Battambang, Cambodia F Opisthoporus grohi holotype MNHN-IM- 2000 - 35507 from Dak Nong, Vietnam. Photograph: H Wood, NMW (B), M Caballer, A Lardeur and V Heros, MNHN (E, F).