Systematics of shrimps of the family Nematocarcinidae (Crustacea, Decapoda) from collections of the Berlin natural history museum and Senkenberg museum of natural history and research institute (Germany)

Lenzicarcinus struncki gen. et sp. is described. This species is similar to those of the genera Nematocarcinus and Nigmatullinus in pereipod morphology and gill formula and differs from shrimps of the genus Lipkius in the same characteristics. The new genus is close to Nigmatullinus by the presence of immovable teeth on the rostrum and the absence of both the spine on pleura of the fifth abdominal segment and disto-ventral organ on the sixth abdominal segment. It differs from this genus by short telson without dorsal spines, shorter rostrum with smaller number of ventral spines, and larger number of dorsal ones. Species of only this new genus have a carina on the dorsal surface of the third abdominal segment, stylocerity plate broadened upward, and subdistal abdominal spines on lateral surfaces of the telson. The new species N. tuerkayi differs from the closely related species N. africanus by the larger number of teeth on the dorsal rostrum edge (16-21 versus 12-18), morphology of the dorsal extension of the posterior edge of the third abdominal segment, and the absence of the accessory spine on telson. The diagnosis of N. chacei Burukovsky 2002 was revised, and new data on the distribution of N. nudirostris Burukovsky 2000 were given.