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)

MISCELLANEA ZOOLOGICA HUNGARICA Tomus 6. 1991. p. 53-60 On a small collection of non-marine ostracods from Mongolia, with the description of a new species (Crustacea, Ostracoda)* by K. MARTENS (Received June 10,1991) Abstract: A small collection of freshwater ostracods from Mongolia is identified. In all, seven species are found. Ifyocypris mongolica n. sp. is here described as new; its main characteristic features are the long natatory setae on the A2; the divided penultimate segment on the Tl, the two lateral setae and the apical hook-like structures on the penultimate segment of the T2 and the shape of the Is, the ms and the stylus of the hemipenis. Two of these features are here used for the first time in this genus and their validity in broader future revisions in this group is discussed. While evaluating the position of the new species in the genus, Ifyocypris nartmanni from Lake Tiberias is reinstated as a valid species, quite distinct from /. monstrifica, while /. turca is considered a junior synonym of /. brehmi, both described from Turkey. The main zoogeographical component of this limited collection from Mongolia is Palaearctic Key words: Ifyocypris mongolica sp. n., Crustacea, Ostracoda, Mongolia INTRODUCTION The recent non-marine ostracod fauna of Mongolia and surrounding territories remains ill known. Most faunistic and taxonomic reports date from the first decade of this century: SARS (1903a,b) on China and Sumatra, DADAY (1901, 1903, 1904, 1909) on Mongolia, Turkestan and the western part of China. Since then, no significant contributions have been published. In all, several dozens of species have been reported from this region. Most of these taxa, however, were never found again and their types are either lost or were never re-examined (exception: Ifyocypris dentifera and /. angulata - see below). As a consequence, the taxonomic position of these species remains highly obscure. As usual, related entomostracous groups such as Branchiopoda and Copepoda are somewhat better off, and a number of more recent reports update the faunistic lists for these regions (BRTEK et ai 1984, FLÖSSNER 1986). WILLIAMS (1991) gives a thorough and educative review of the saline inland waters of Mongolia and China. Information on the ostracods from these regions cited by him is scarce, and constitutes mostly unpublished and isolated identifications. His main zoogeographical conclusions are discussed below. Finally, a number of larger Mongolian lakes belongs at least partly to the Baikalian Realm or Subrealm (according to source) in the Palearctic; an account of these fauna's is presently been evaluated by MAZEPOVA (in prep.). *Ergebnisse der zoologischen Forschungen von Dr. Z. Kaszab in der Mongolei, Nr 504.