Opisthoporus ngocthachi (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 ngocthachi (Huber, 2020)

Fig. 58D

Rhiostoma ngocthachi Huber in Thach, 2020: 19, figs 159, 160. Type locality: Ninh Hoa District, Khanh Hoa Province, Central Vietnam.

Type material.

Holotype MNHN-IM-2000-35508 (Fig. 58D ) from Ninh Hoa District, Khanh Hoa Province.

Remarks.

This species was described based on a single specimen. The original description states "operculum exteriorly white with many concentric layers and interiorly glossy, dark brown with a central nucleus and extremely thick margin". In addition, the shell bears a nearly flattened spire, a monochrome yellowish brown periostracum, the lip slightly thickened but not expanded, and tubular breathing device located away from the apertural lip, which are the diagnostic characters of the genus Opisthoporus . Therefore, we have reclassified this species to the genus 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).