REVISION OF SIMOCEPHALUS DAPHNIIDAE 
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Fig. 40S. serrulatus. A, ephippial female, B, postabdomen, male, C, male, D, outer side of male postabdominal claw. 
because it was originally discovered by B. Hann (D. Berner, per- 
sonal comunication) and she has already started working on its 
description. 
This species undoubtedly belongs to the S. (acutirostratus) spe- 
cies group because its frons is pointed, without denticles, and its 
postabdomen has two supra-anal angles. It differs from S. 
acutirostratus, S. brehmi and S. rostratus in the absence of a dorso- 
posterior valve prominence and from S. victoriensis in the shape of 
the postabdomen and head. 
Subgenus S. (Coronocephalus) Orlova-Bienkowskaja, 1995 
TYPE SPECIES. Simocephalus serrulatus (Koch, 1841). 
DIAGNOSIS. Both sexes (Figs 39-42). Frons right-angled, with 
denticles (S. serrulatus, S. semiserratus) or without them (S. 
mirabilis). Head shield without depression. Head pores absent. 
Insertion of antennules at end of rostrum. Antennule short in corre- 
spondence with short rostrum, with transversal ridges covered with 
denticles on inner side. Aesthetes shorter than base of antennule. 
Postabdominal claw with spines on proximal part of outer side and 
on inner side. Basal part of outer side with fine setules. Anal bay of 
postabdomen narrow, rounded, with anal teeth. 
Female. Dorso-posterior valve angle with rounded prominence. 
Valves without dorsal keel. Posterior corner of ephippium without 
protuberance. Ocellus short (S. serrulatus and S. semiserratus), or 
elongate (S. mirabilis). Setae of 2nd and 3rd endite prominence of 
