. Bulletin of the Natural History Museum Zoology. 52 ORLOVA-BIENKOWSKAJA. Fig. 54 5. lusaticus. A, parthenogenetic female, B, parthenogenetic female ventral, C, ephippial female, D, male, E, parthenogenetic female, F, parthenogenetic female. G, postabdomen, female, H, antennule, female, I, distal part of postabdomen, male, J, parthenogenetic female. K. parthenogenetic female, ventral, L, 5th trunk limb, female, M. 2nd trunk limb, female. A-C. G, H, L, M after Behning, 1925, D, I, J, K after Herr. 1917. E, F after Sramek-Husek et al., 1962. edge. No denticles on ventral edge. Ocellus elong
. Bulletin of the Natural History Museum Zoology. 52 ORLOVA-BIENKOWSKAJA. Fig. 54 5. lusaticus. A, parthenogenetic female, B, parthenogenetic female ventral, C, ephippial female, D, male, E, parthenogenetic female, F, parthenogenetic female. G, postabdomen, female, H, antennule, female, I, distal part of postabdomen, male, J, parthenogenetic female. K. parthenogenetic female, ventral, L, 5th trunk limb, female, M. 2nd trunk limb, female. A-C. G, H, L, M after Behning, 1925, D, I, J, K after Herr. 1917. E, F after Sramek-Husek et al., 1962. edge. No denticles on ventral edge. Ocellus elongate. Frons without denticles. Setae of 2nd and 3rd endite prominence of 2nd trunk limbs as long as and of basal segment of plumose seta of 1 st prominence respectively. Distribution. (Fig. 43) North and South America. Remarks. S. mirabilisdiffers fromS. serrulatus andS. semiserratus in the elongate ocellus and the absence of denticles on the frons. However, I assign it to the subgenus S.(Coronocephalus), because of the following characters: frons right-angled; antennule short, with transversal ridges covered with denticles on inner side; postabdominal claw with spines on proximal part of outer side and on inner side. Subgenus 5. (Aquipiculus) Orlova-Bienkowskaja, 1995 Type species. Simocephalus latimstris Stingelin, 1906 DIAGNOSIS. Both sexes (Figs 47-50). Frons rounded, without denticles. Head shield depressed or flattened in middle. Head pores present. Insertion of antennules at base of rostrum. Antennule long in correspondence with long rostrum, with neither ridges nor denticles on inner side. Aesthetes shorter than base of antennule. Postabdominal claws without pecten of spines. Inner and outer side of claw with fine setules. Anal bay of postabdomen straightened in the middle, its proximal part without anal teeth. Female. Dorso-posterior valve angle with large prominence. Valves with dorsal keel. Posterior corner of ephippium with protuberance. Ocellus short or slig
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