Bilocypris, Halse & Martens, 2019

Halse, Stuart A. & Martens, Koen, 2019, Four new genera and five new species of ‘ Heterocypris’ from Western Australia (Crustacea, Ostracoda, Cyprinotinae), European Journal of Taxonomy 493, pp. 1-35 : 17-18

Bilocypris gen. nov.

urn:lsid:zoobank.org:act:5A47A7DD-B9FE-4703-9941-38EA85B53280

Type species

Bilocypris fortescuensis gen. et sp. nov. (here designated).

Other species

Bilocypris mandoraensis gen. et sp. nov.

Diagnosis

Valves higher in posterior half than anterior, LV overlapping RV on all sides. RV with marginal tubercles at least along anterior and postero-ventral margins; in between these zones RV with outer list; these marginal tubercles sometimes strongly developed. RV with anterior selvage sub-marginal and with posteroventral selvage more clearly inwardly displaced. LV anteriorly with blunt inner list parallel to valve margin. A1 with all segments of normal length/width ratio. Second segment of Mx1 palp slightly longer than basal width, not curved. Seta d2 on T2 absent. CR in both male and female moderately curved and slightly expanded in proximal part; attachment to CR uniramous, i.e., distally not bifurcated. Hemipenis in males with lobe ms bilobed, lobe ls of equal length to ms. Females in both species in this genus with large, rounded genital lobes.

Etymology

The name of this new genus refers to the fact that lobe ms of the hemipenis is bilobed. We have abbreviated ‘bilobe’ to ‘bilo’ for convenience.

Differential diagnosis

Bilocypris gen. nov. has valve characteristics that are similar to those in Heterocypris , but differs from all other genera in the Cyprinotinae by the structure of the hemipenis, which consists of a bilobed ms and a lobe ls of the same length as the ms.

The new genus can be distinguished from Cyprinotus by the absence of the dorsal hump on the RV, from Hemicypris and Homocypris by the fact that the LV overlaps the RV (inverse in Hemicypris ; valves symmetrical in Homocypris ) and from Riocypris by the absence of seta d2 on limb T2, among other features.

Distribution

Both species in the genus are known from northwest Western Australia (Pilbara and southern Kimberley regions).