By B. Entz, D. Lukács (auth.), László Forró, David G. Frey (eds.)
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Additional resources for Cladocera: Proceedings of the Cladocera Symposium, Budapest 1985
Carapace oval with convex dorsal margin and distinct depression at posterior joint. Surface finely granulated. Ventral margin concave in middle because of membraneous margin being bent to median axis of carapace; in preserved specimens often folded inside. Proximal part with up to 15 long, plumose setae, decreasing in size distally. Middle and posterior part with 10 to 25 marginal, thorn-like spines, grouped by two to four, groups separated by fine, long hairs. Posteriormost margin with submarginal row of fine spinules on inner side.
Topotypes were compared with other populations and new synonymy suggested: previously described D. birgei spp. lacustris Korinek, 1981 is a synonym of D. mongolianum, and D. orghidani Negrea, 1982 was synonymized with D. chankensis. All three species belong to a group without a separate flap on the ventral margin of the carapace. Diaphanosoma mongolianum is a palaearctic species with possibly close relationship to the New-World-species D. birgei Korinek. D. chankensis is a poorly known species found in several lakes in the Far East and with a peculiar distribution in lakes along the lower river Danube and in the eastern part of the Carpathian Mountains in Roumania.
41 cone, flattened laterally. Total length of head from basis of labrum to top equals about one-half of carapace length. Frontal part of head vaulted, where compound eye is situated; no ocellus. Dorsal part filled with two bands of strong muscles extending between head-top and basis of antennae (ventral aspect). 5 to 3 times longer than basal segment, with 8 sensory setae. Labrum tongue-like, with narrow apical ciliated processus, from ventral aspect with two basal lobes, depressed in middle and rounded at apex.