Palaeorak, Kotov, 2009

Kotov, Alexey A., 2009, A revision of the extinct Mesozoic family Prochydoridae Smirnov, 1992 (Crustacea: Cladocera) with a discussion of its phylogenetic position, Zoological Journal of the Linnean Society 155 (2), pp. 253-265 : 259

PALAEORAK GEN. NOV.

Type (sole) species: Palaeorak scherbakovi sp. nov.

Etymology: The name of the new genus comes from Greek Palaeo (ancient), and Rak , the generic name of a chydorid with blunt rostrum and well-developed setae on the ventral margin of the valve, described by Smirnov & Timms (1983). The name Rak is derived from the Russian word ( rak ) for a crustacean.

Diagnosis: Body moderately high, head capsule of ‘chydorid-type’ (compressed dorso-ventrally), covered with ‘flat’ head shield with rostrum truncated, valves with denticles and short setae along ventral margin of valves, mandible attached to point of joint of head shield and valve.

Comments: The genus is probably a few million years younger than Prochydorus and Archeoxus .