32 



M.J. ORLOVA-BIENKOWSKAJA 
Fig. 54  S. Jusaticus. 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 0.6 and 0.4 of basal segment of plumose seta of 1st prominence respectively. 
DISTRIBUTION. (Fig. 43) North and South America. 
REMARKS. _ S. mirabilis differs from S. serrulatus and S. 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 S. (Aquipiculus) Orlova-Bienkowskaja, 
1995 
TYPE SPECIES. Simocephalus latirostris 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 
oninner 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 slightly elongate, but always shorter than in S. 
vetulus. Setae of 2nd and 3rd endite prominence of 2nd trunk limb as 
long as 0.6—-0.7 and 1.4—1.6 of basal segment of plumose seta of Ist 
prominence respectively. Postabdomen with 5—10 anal teeth on each 
side. Supra-anal angle pointed. 
Male. Supra-anal angle pointed. Vas deferens opening in middle of 
anal bay or at base of supra-anal angle. Postabdomen with 5—7 anal 
