. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE 23 Monoculus exspinosus De Geer, 1778: 457; Daphnia exspinosa: Koch, 1841: 35; Daphnia sima: Lievin, 1848; Baird, 1850: 95; SimocephalusexspinosusSchodler, 1858: 20; Lilljeborg, 1900: 177; Daphnia australiensis Dana, 1852: 1271; Sars, 1888: 15; S. exspinosus australiensis: Dumont, 1983: 104: 5. sibiricus Sars, 1898: 329 syn. nov. ; S. productus Sars, 1903: 173; 5. himalayensis Chiang & Chen, 1974: 129 syn. nov.; S. vamani Rane, 1985b: 225. Type material. The types appear to be lost There are no speci- men
. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE 23 Monoculus exspinosus De Geer, 1778: 457; Daphnia exspinosa: Koch, 1841: 35; Daphnia sima: Lievin, 1848; Baird, 1850: 95; SimocephalusexspinosusSchodler, 1858: 20; Lilljeborg, 1900: 177; Daphnia australiensis Dana, 1852: 1271; Sars, 1888: 15; S. exspinosus australiensis: Dumont, 1983: 104: 5. sibiricus Sars, 1898: 329 syn. nov. ; S. productus Sars, 1903: 173; 5. himalayensis Chiang & Chen, 1974: 129 syn. nov.; S. vamani Rane, 1985b: 225. Type material. The types appear to be lost There are no speci- mens of this species in the collection of De Geer deposited in the Museum of Natural History in Stockholm (L. Sandberg, curator of Crustacea, personal communication). The type locality is not indi- cated in the original description (De Geer, 1778). Material examined. Type material of junior synonyms: S. sibiricus Sars, 1898: Lectotype (designated here): Russia, Siberia, Verkhoyansk, 1885: MPA: 9 ad. (ZICC, 4691). Paralectotypes col- lected with lectotype: 9 9 9 ad. (ZICC, 4691). S. productus Sars, 1903: Lectotype (designated here): Kazakhstan, Akmolinsk region: MPA: 9 ad. (ZICC, 7098). Paralectotypes collected with lectotype: 35 9 9 ad. (ZICC, N7098). Other specimens: more than 1000 speci- mens (9 9 ad., 9 9juv.,9 9e,d"d') from 56 localities in Russia, Ukraine, Georgia, Kazakhstan, Uzbekistan, Tadjikistan, Mongolia, China, India, Pakistan, Bangladesh, Egypt, Algeria, Rwanda, South Africa and Australia. Material is deposited in AC, ZICW, ZICC, MCA, SAM, AM. Some specimens are selected from the samples from ZIPD. Diagnosis. Measurements. 9 9 ad.: , 9 9 e.: : Female. (Fig. 28). 12-22 anal teeth. Prominence of dorso-posterior valve angle small or absent. Basal pecten of postabdominal claw of 8-12 spines of moderate size. Distribution. This species is assumed to be cosmopolitan by many authors, but its range needs to be redefined. It occurs with ce
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