Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus Nagler, Christina Geist, Juergen Matzke-Karasz, Renate Zootaxa 2014 2014-06-24 3821 4 401 424 8c3dca7b-8068-4e11-a8e8-63c2d683b639 (G. W. Muller, 1898) G. W. Muller 1898 [151,754,1629,1655] Ostracoda Cyprididae Tanycypris GBIF Animalia Podocopida 10 411 Arthropoda species madagascarensis  ( Figs 5E, 6E, 6J, 7B, 8) * v 1898  Cypris madagascarensisG. W. Müller: 271–273, pl. 16, 7–13. 1912  Dolerocypris madagascarensis—G.W. Müller: 193.  v 1959  Tanycypris madagascarensis—Triebel: 167–169, pl. 16, 19a. pl. 17, 19b–21. pl. 18, 24–28.   Diagnosis.L = 1.42–1.66 mm, H = 0.57–0.66 mm; greatest width in the middle. Females 0.1 mmlonger than males on average. Carapace in dorsal view narrow. Valves asymmetric. RV smaller than LV, LV with an obtuse angle at the joining of the posterior and ventral margin ( Fig. 8A, B) Dorsal margin weakly arched; ventral margin slightly concave. A1 with Wouters organ and Rome organ and with extremely long setae on the fifth, sixth, seventh and eighth segment ( Fig. 5E). T1 with b and d seta, asymmetric in males ( Fig. 6J). T2 with very long and strong d, and thin, small d2. CR stoutly built, weakly bent; setules gradually decreasing in length from distal to proximal; Sp very long in relation to the Sp of other  Tanycyprisspecies( Fig. 6E). Trunk of CR attachment as wide as trunk of CR; cone-like, short vb, slim, sinuous db ( Fig. 7B). Male hemipenis with a deep incisure in the lateral shield. Zenker organ with 30 rosettes of chitinous rays ( Müller 1898; Triebel 1959).  History. Müller (1898)described  Cypris madagascarensisfrom Majunga, Madagascar, and deposited the holotype[Cat II, No. 24626 (32a)] and several paratypesin the ZMG. Later, he transferred the species to  Dolerocypris( Müller 1912). Triebel (1959), when erecting the genus  Tanycypris, designated  Tanycypris madagascarensisas type species.  Similar species.  Tanycypris madagascarensisis the largest species of the genus and has a characteristic posterior-ventral angle in the LV. It has a characteristic db on the CR attachment. The Sp on the CR is relatively long and all appendages are strongly built. The setae on all appendages are relatively long. This species cannot be mistaken for other species of the genus  Tanycypris.