Abstract
A new genus, Thaicypris gen. nov., in the tribe Herpetocypridini Kaufmann, 1900 of the subfamily Herpetocypridinae Kaufmann, 1900 is established to accommodate a new species from Thailand. The present contribution deals with the description of a new genus and species, Thaicypris panhai gen. et sp. nov., which is mainly characterized by the distinctive and raised, inwardly displaced selvage at the postero-ventral part of the right valve (RV) that is not parallel to the valve margin, the absence of an anterior inner list on the RV, the prominent and elevated double inner list on the posterior part of the left valve, the small and three-segmented Rome organ on the first antenna (A1), the spatulated terminal segment of the maxillular (Mx1) palp, the slender caudal ramus (CR) with long and thin Sp seta, the presence of basal triangle on the CR attachment, and the pointed projection at the terminal segment base of the prehensile palps. The hemipenis of the new genus and species is outstanding, especially the medial lateral shield which has a long, beak-shaped protrusion on the distal part. The discovery of this Thai taxon is the first record of the tribe Herpetocypridini in Thailand and the second species of the tribe in Southeast Asia.
Highlights
Herpetocypridinae Kaufmann, 1900 is a large subfamily of Cyprididae Baird, 1845 which includes 15 genera and 155 species (Meisch et al 2019)
Soft parts and valves were separated under a stereo microscope (Olympus SZ40) and subsequently soft parts were dissected in glycerine, sealed on glass slides and valves were stored dry on micropalaeontological slides
The detailed morphology of the valves and soft parts indicates that this Thai taxon cannot be placed in these genera
Summary
Herpetocypridinae Kaufmann, 1900 is a large subfamily of Cyprididae Baird, 1845 which includes 15 genera and 155 species (Meisch et al 2019). The revision of the European Herpetocypris Brady & Norman, 1889 was extensively made by Gonzalez Mozo et al (1996) while the taxonomy of the entire subfamily was revised by Martens (2001). These works revealed the morphology of both soft parts and valves, which has provided significant taxonomic characters within the subfamily. Many species about which we previously had insufficient taxonomic information, have been redescribed, for example the species of Ilyodromus Sars, 1894 (Shearn et al 2014) and Stenocypria G.W. Müller, 1901 (Scharf et al 2020). The investigations into the detailed structures of both valves and soft parts offered more
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