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)

I. brehmi Schäfer from Turkey somewhat resembles 7. mongolica sp. n. in the shape of the valves. But also this species has an undivided penultimate segment on the 77. It should furthermore be noted that Ifyocypris turca, described by GHETTI (1972) from a ricefield in Turkey, is without any doubt a junior synonym of /. brehmi Ifyocypris nagamalaiensis Victor & Michael from India is much smaller and has a very aberrant valve outline, even to the extent that its generic assignement should be re-investigated. Nothing is known with regard to the soft part anatomy of Ifyocypris taprobanensis Neale from Sri Lanka. Its valve anatomy is relatively non-descriptive, but the species is again significantly smaller than /. mongolica sp. n. The shape of the valves furthermore separates the new species from /. nitida Lerner-Seggev (from Lake Tiberias - very elongated) and from /. hartmanni Lerner-Seggev (idem) and I. monstrifica (Norman, 1862) (both species always set with large lateral tubercules). It should be noted that HENDERSON (1990) implicitely synonimized I. hartmanni witb /. monstrifica. However, comparison of topotype material from Lake Tiberias of the former taxon with Western European (Belgian) specimens of the latter species clearly shows that these are two good and very distinct species. In the shape of the hemipenis (Is and ms), I. mongolica sp. n. furthermore differs at least from I. hartmanni and I. divisa Klie; the latter species furthermore has a nearly squarish posterior extremity in dorsal view, which is bluntly pointed in /. mongolica sp. n. The following species have an undivided third (penultimate) segment on the Tl: I. gibba (Ramdohr), / biplicata (Koch), /. australiensis Sars s.l., /. iners Kaufmann and /. lacustris Kaufmann. The 72 has three setae (instead of two) on the penultimate segment in I. lacustris and /. getica Masi. I. braayi Sars and /. inermis Kaufmann s.l. have reduced natatory setae on the A2. 2. New characters The taxonomy of the genus Ifyocypris is confused and the identification of its species never easy, not even when males are available. The few characteristics commonly used to distinguish between the various species are (see above): surface sculpture (very variable), length of natatory setae on A2 (generally suspect), penultimate segment on Tl divided or not and number of lateral setae on the penultimate segment of the T2. In order to improve on this situation, new characters need to be introduced. I will here briefly discuss the value of two of such new morphological features. Copulatory process The actual copulatory process in the hemipenis of I. mongolica sp. n. has the shape of a long, narrow, bluntly pointed and slightly sinuous sclerified stylus. As this process takes part in the actual copulation, but also in the pre-copulatory behaviour, i.e. stimulating the female into accepting the male, its morphology is in all probability species-specific. A brief survey of material of species available to me showed that this structure indeed has a different morphology in different taxa. It still has a stylus-shape in /, getica, but much shorter and wider. It is significantly curved in Ifyocypris spec. sp. n. (described from the Sudan by MARTENS, 1984) and is a rounded structure in the North African populations of what is still called 7. australiensis. Especially this structure shows great promise as a useful tool for the revision of bisexual Z/yocy^/is-populations.