Opisthoporus battambangensis (Thach & Huber, 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 battambangensis (Thach & Huber, 2020)

Fig. 57E

Rhiostoma battambangensis Thach & Huber in Thach, 2020: 18, figs 153, 154. Type locality: Battambang City, Battambang Province, Cambodia.

Type material.

Holotype MNHN-IM-2000-35506 (Fig. 57E ) from Battambang City, Battambang Province.

Remarks.

This species was described based on the holotype, and by three paratypes housed in the authors’ collections. The operculum is attached with the holotype and has a calcareous, multispiral, and plate-shaped operculum; the shell has a short detached whorl and yellowish brown periostracum. The outer peristome is slightly expanded with short tubular breathing device located on the suture area of the detached whorl, and the inner peristome has a shallow incision. These are the distinguishing characters of Opisthoporus ; 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).