. Bulletin of the Natural History Museum Zoology. 12 ORLOVA-BIENKOWSKAJA. Fig. 11 S. vetulus, female trunk limbs. A, 4th limb, B, endopod of 4th limb, C, 5th limb. Female. Dorso-posterior valve prominence of moderate length, with wide base and large diameter (Fig. 23). Its diameter (Fig. 2) exceeds its length. Dorsal valve margin high, protruding backward. Depres- sions above and below dorso-posterior prominence of moderate size (deeper than in S. vetulus, but more shallow than in S. vetuloides, S. gibbosus and ). Ventral head margin straight or slightly concave, sometimes wi
. Bulletin of the Natural History Museum Zoology. 12 ORLOVA-BIENKOWSKAJA. Fig. 11 S. vetulus, female trunk limbs. A, 4th limb, B, endopod of 4th limb, C, 5th limb. Female. Dorso-posterior valve prominence of moderate length, with wide base and large diameter (Fig. 23). Its diameter (Fig. 2) exceeds its length. Dorsal valve margin high, protruding backward. Depres- sions above and below dorso-posterior prominence of moderate size (deeper than in S. vetulus, but more shallow than in S. vetuloides, S. gibbosus and ). Ventral head margin straight or slightly concave, sometimes with small prominence. Depression on ventral head margin near rostrum deep. Ocellus elongate. Distribution. America. (Fig. 21) Asia, Eastern Europe, N. Africa, N. Remarks. Behning (1941) supposes S. mixtus to be a separate species. Manujlova (1964) believes it to be a synonym of S. elizabethae. Negrea (1983) and Flossner (1972) consider it to be a synonym of S. vetulus. Investigation of the type has shown that S. mixtus differs from both S. vetulus and S. elizabethae. S. corniger Methuen was described from South Africa. There is no information about the type material. The original description (Methuen, 1910) is very brief. Judging from illustrations, S. corniger is a junior synonym of 5. mixtus. S. beianensis Shi, Shi, 1994 was described from China (Heilongjang Province, 48°16'N, 126°31'E)(Shi & Shi, 1994). The authors write that this species differs from S. vetulus in details of ocellus and in number of the anal teeth. Both characters are variable. Referring to the illustration, the ocellus of S. beianensis does not sufficiently differ from the ocellus of S. vetulus and 5. mixtus. The number of anal teeth does not also differentiate these species. S. mixtus hungaricus Ponyi, 1956 is not in fact S. mixtus. It is a synonym of S. vetulus (see above). S. serrulatus var. mixta Grochmalicki (1915) belongs to another subgenus. It is a junior homonym of S. mixtus. S. vetuloides Sa
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