Abstract
The new genus Thaicypridopsis gen. nov. described here belongs to the tribe Zonocypridini Higuti & Martens, 2012 in the subfamily Cypridopsinae Kaufmann, 1900. It is the first record of the Recent representatives within this tribe in Southeast Asia and Oriental regions. Thaicypridopsis gen. nov. has a number of remarkable characters that distinguish it from other genera in the subfamily: a submarginal row of distinctive tubercles on the postero-ventral part of the right valve in the interior view, a strong serrated claw G2 on the second antenna with an apical concavity, large bristles with hirsute endings and spatula-shaped apexes on all three maxillular endites and a bifurcate tip on the terminal claw of the second thoracopod. One new species, Thaicypridopsis longispinosa sp. nov., is described under this new genus in the present contribution. Apart from the above diagnostic characters, the new species also has long spines on the valve surface as its outstanding feature. The new taxon is morphologically compared with other related species and genera within and outside the subfamily Cypridopsinae. In addition, due to the new genus belonging to a group of genera with the left valve overlapping the right valve in the subfamily, a key to the genera within this group is given.
Highlights
One new genus based on one new species belonging to the tribe Zonocypridini of the subfamily Cypridopsinae is described from Thailand
The name is a combination between the abbreviated country name (“Thai”) and the existing generic name “cypridopsis”
The new species seems to resemble the Cypridopsis representatives, but its limbs’ morphology is different in many aspects, especially the strongly serrated claw G2 on the A2, the large bristles with spatula-shaped apex on the Mx1-endites and the T2 terminal claw with bifurcate tip. These features of the new species are not found in the Cypridopsis
Summary
Cypridopsinae Kaufmann, 1900 which, is the most diverse subfamily in the family Cyprididae Baird, 1845, is presently composed of 18 genera: Austrocypridopsis McKenzie, 1982; Bryocypris Røen, 1956; Cabelodopsis Higuti & Martens, 2012; Cavernocypris Hartmann, 1964; Cypridopsis Brady, 1867; Kapcypridopsis McKenzie, 1977; Klieopsis Martens et al 1991; Martenscypridopsis Karanovic, 2000; Neocypridopsis Klie, 1940; Plesiocypridopsis Rome, 1965; Potamocypris Brady, 1870; Pseodocypridopsis Karanovic, 1999; Sarscypridopsis McKenzie, 1977; Siamopsis Savatenalinton, 2017; Tanganyikacypridopsis Martens, 1985; Thermopsis Külköylüoğlu et al, 2003; Tungucypridopsis Victor & Fernando, 1983; and Zonocypris Müller, 1898 (Martens & Savatenalinton 2011; Higuti & Martens 2012; Savatenalinton 2017). The reexamination of Zonocypris hispida (Sars, 1901) based on new material from Brazil revealed that this species is quite different from other cypridopsine taxa, a new genus, Cabelodopsis, was erected for it (Higuti & Martens 2012). This is merely an example to show that a revision is needed in the subfamily.
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