Opisthoporus tener (Menke, 1856)

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 tener (Menke, 1856)

Fig. 58F

Pterocyclos tener Menke, 1856: 69. Type locality: Touranne, Cochinchinae [Da Nang Province, Vietnam]. Pfeiffer 1856: 90, 91, pl. 25, figs 13-15. Pfeiffer 1858: 32. Reeve 1863: Pterocyclos pl. 5, species 28.

Rhiostoma tener - Benson 1860: 97.

Rhiostoma tenerum [sic]- Pfeiffer 1865: 40.

Opisthoporus tener -Kobelt and Möllendorff 1897: 119.

Cyclotus (Siphonocyclus) tener - Möllendorff 1900: 135, 136. Kobelt 1902: 212

Other material examined.

Specimen NHMUK ex. Cuming collection (3 shells; Fig. 58F ) from Cochin China.

Remarks.

The type specimens of this species could not be located. However, the NHM collection contains a lot of three shells from the Cuming collection with an original label, probably in Pfeiffer’s handwriting, stating the species name and collection locality, but this label was subsequently overwritten. One of these three shells matches well with the illustration in Pfeiffer (1856: pl. 25, figs 13-15). These specimens exhibit unique characteristics, including a short detached whorl and a breathing device with a short tubular shape pointed anteriorly. These characteristics suggest that it be classified as a member of the Opisthoporus .

Figures

Figure 58. A, B Opisthoporus herosae A holotype MNHN-IM- 2000 - 33198 from Ninh Binh, Vietnam and B holotype FMNH 386285 of Rhiostoma ninhbinhensis Thach & Huber, 201, from Ninh Binh, Vietnam C Opisthoporus ngocngai holotype FMNH 386291 from Ninh Hao, Vietnam D Opisthoporus ngocthachi holotype MNHN-IM- 2000 - 35508 from Khanh Hoa, Vietnam E Opisthoporus thorsengi holotype BOR / MOL 14587 from Dak Nong, Vietnam F Opisthoporus tener specimen NHMUK ex. Cuming collection. Photographs: M Caballer, A Lardeur and V Heros, MNHN (A, D, F), J Gerber, FMNH (B, C), T-S Liew, BORNEENSIS (E).