. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE 49 Paralectotypes collected with lectotype: CBS: 9 9 9 ad., 2 9 9juv. (ZMO, F 9176, F 9177), Argentina: MPA: 15 9 9 10 9 9juv„ 69 9e.,d"(ZMO, F 18438); MPA: 27 9 9ad., 29 9juv„ 39 9e. (BMNH, 1901. 12. ). Material examined (Fig. 43). Lectotype, paralectotypes. Diagnosis. Measurements. 9 9 ad.: 9 9 e. 1. 5mm, cTcf: Female (Fig. 44). Dorso-posterior valve prominence small, sepa- rated from the rest part of valves by shallow embayments. Its length less than the diame
. Bulletin of the Natural History Museum Zoology. REVISION OF SIMOCEPHALUS DAPHNIIDAE 49 Paralectotypes collected with lectotype: CBS: 9 9 9 ad., 2 9 9juv. (ZMO, F 9176, F 9177), Argentina: MPA: 15 9 9 10 9 9juv„ 69 9e.,d"(ZMO, F 18438); MPA: 27 9 9ad., 29 9juv„ 39 9e. (BMNH, 1901. 12. ). Material examined (Fig. 43). Lectotype, paralectotypes. Diagnosis. Measurements. 9 9 ad.: 9 9 e. 1. 5mm, cTcf: Female (Fig. 44). Dorso-posterior valve prominence small, sepa- rated from the rest part of valves by shallow embayments. Its length less than the diameter of circle inscribed in its contour. Denticles cover less than Vi of posterior and less than 1/3 of dorsal margin. No denticles on ventral margin. Ocellus short. Frons with denticles. Morphology of trunk limbs unstudied, because it was impossible to dissect the type material. Distribution. (Fig. 43) Argentina, Brasil (Sao Paulo). Remarks. Daday (1905) believes 5. semiserratas and S. capensis to be one species. Kanduru (1981) and Michael & Sharma (1988) sink S. semiserratus into the synonymy of 5. serrulatus. Sars (1901) writes: 'I am enabled to state with full certainty its [S. semiserratus] distinctness from the European species [S. serrulatus]. In addition to its somewhat larger size, it is easily distinguished by the far less prominent posterior projection of the carapace, and somewhat dif- ferent shape of the head. The marginal denticles, moreover, which in S. serrulatus extend throughout the whole length of the hind margin. are in this species always limited to their uppermost part only'. It is my belief that S. semiserratus is a separate species. First, statistical analysis shows that it is separated from S. serrulatus in two pairs of independent metric characters (Orlova-Bienkowskaja, 1995a). Sec- ond, it differs from it in the marginal denticles of the valves. Third, it occurs in South America sympatrically with 5". serrulatus and cannot be a geographica
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