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Postabdominal claw with stout proximal pecten (pp) and very fine distal pecten (dp) [better seen under scope];
sensory bristle (b) near midpoint between eye (e) and tip of rostrum (tr)
Postabdominal claw with proximal pecten (pp) only; sensory bristle (b) near tip of rostrum (tr) [near or at base of antennule].
 
Sensory bristle (b) Stout proximal pecten (pp)
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Brachiopoda
Suborder Cladocera
Family Bosminidae