L. Forró - É. Murai szerk.: Miscellanea Zoologica Hungarica 6. 1991 (Budapest, 1991)

Martens, K.: On a small collection of non-marine ostracods from Mongolia, with the description of a new species (Crustacea, Ostracoda)

Hook-like structures on T2 It appears that a certain group of species in this genus has such structures, again in varying shape and number, which makes it a handy identification character in cases where males remain absent. As was described above, I. mongolica sp. n. has between 4 and 6 hooks, apically inserted on the penultimate segment of the 72. Strongly sclerified, but straight blade-like structures could be detected in I. getica. Other species checked lacked these structures and only had the normal row of fine setulae there. Both sets of characters merit further elaboration and should be described, even for so-called well-known species, whenever material becomes available. DISCUSSION Five of the seven species here recorded have a wide Palaearctic or a Holarctic distribution or are cosmopolitan. Similar conclusions were reached for related crustacean groups by BRTEK et al. (1984) (on Branchiopoda) and FLÖSSNER (1986) (Branchiopoda and Copepoda). The ostracod species recorded by DADAY (1901, 1903, 1904,1909) and SARS (1903a,b) were mostly inadequately described as new; their status needs urgent clarification. Cypridopsis dubia is an Asian species, unknown in Europe, and probably represents a new genus, which occurs both in Africa and in Asia (MARTENS & MEISCH, in preparation). Ifyocypris mongolica sp. n. is thus far known from its type locality only. A higher degree of endemism in this genus is not unusual. Although both localities with ostracods are noted as being 'saline', most species reported here are purely freshwater taxa. Only Heterocypris salvia is known to occur in waters with salinities around 3 g/1 or more. There is no information on the exact water chemistry of both localities. WILLIAMS (1991) recently gave a review on the saline lakes of Mongolia and China. He concluded that most lakes of low or moderate salinity comprise widespread halotolerant freshwater forms, which seems to coincide with the present data on the ostracods. It should finally be noted that I. mongolica sp. n. is probably not a 'regionally endemic halophile', as it occurs together with the freshwater species Cypris pubera. ACKNOWLEDGEMENTS I thank Dr L. FORRÓ (Budapest) for his help with the literature on Mongolian limnology and for allowing me to study the ostracod material from his Museum. Mrs C. BEHEN offered technical assistance with the plate. REFERENCES BROODBAKKER, N. & D.L. DANIELOPOL, (1982): The chaetotaxy of Cypridacea (Crustacea, Ostracoda) limbs: proposals for a descriptive model. - Bijdragen tot de Dierkunde, 52:103-120. BRTEK, J., L. FORRÓ & J.E. PONYI (1984): Contributions to the knowledge of the Branchiopoda (Crustacea) fauna of Mongolia. - Annls hist-nat. Mus. nam, hung, 76: 91-99. CHEN SHOU-ZHONG, (1990): Description of a male Ifyocypris angulata Sars (Crustacea, Ostracoda). - Acta micropalaeontologica Sinica, 7:257-264.