|Cryptosemelus niger S. Tumpeesuwan & C. Tumpeesuwan, |
in Tumpeesuwan, Tanmuangpak & Tumpeesuwan, 2023.
หอยหางดิ้นสีนิล || DOI: 10.3897/zookeys.1163.103650
In this study, we describe a new dancing semislug from a limestone hill area in northeastern Thailand. Cryptosemelus niger sp. nov. differs from the three recognized congener species from western and southern Thailand, due to differences in their body and shell lobes coloration, appearance of penial caecum, shape and surface texture of penis and epiphallus, and radula formula and morphology.
Keywords: Genital system, karst topography, limestone hill, mantle extensions, protective behavior, shell lobes
|Cryptosemelus niger S. Tumpeesuwan & C. Tumpeesuwan, sp. nov. |
A shell morphology of holotype NHMSU-00054 B living snail.
Photograph by Kitti Tanmuangpak
Superfamily Helicarionoidea Bourguignat, 1877
Family Ariophantidae Godwin-Austen, 1883
Subfamily Ostracolethinae Simroth, 1901
Genus Cryptosemelus Collinge, 1902
Cryptosemelus niger S. Tumpeesuwan & C. Tumpeesuwan, sp. nov.
Cryptaustenia sp. Tanmuangpak 2016: 109–110.
Cryptaustenia sp. Chimsaeng 2019: 41–42.
Diagnosis: Animal with blackish body, shell lobes with blackish reticulated skin (Figs 2, 3). Genitalia with very short cylindrical vagina, smooth elongated cylindrical epiphallus, without penial caecum (Fig. 4). Radula with bicuspid lateral teeth (Fig. 5B, C).
Etymology: The species name “niger” is derived from Latin word, meaning “black” referring to blackish body and mantle extensions.
Sakboworn Tumpeesuwan, Kitti Tanmuangpak and Chanidaporn Tumpeesuwan. 2023. New Species of the Dancing Semislug Cryptosemelus Collinge, 1902 (Eupulmonata, Ariophantidae) from Loei Province, northeastern Thailand with A Key to Genera of mainland Southeast Asian Semislugs and A Key to Species of the Genus. ZooKeys. 1163: 47-59. DOI: 10.3897/zookeys.1163.103650