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Postabdominal claw (pc) with four spines; dorsal ramus (dr) of antenna with three segments
 
Postabdominal claw (pc) with three spines; dorsal ramus (dr) of antenna with two segments
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Brachiopoda
Suborder Cladocera
Family Sididae