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Postabdominal claw with stout proximal pecten (pp) and very fine distal pecten (dp) [best seen with an oil immersion: 1000x].
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).
   
Sensory bristle (b) near tip of rostrum
Postabdominal claw with proximal pecten (pp) only
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Brachiopoda
Suborder Cladocera
Family Bosminidae