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28a. Anal operculum with 8 or more small teeth.  Caudal ramus inner margin without spines.  Middle and outer apical caudal setae not fused at base.

Canthocamptus vagus

28b. Anal operculum with 5-7 stout teeth.  Caudal ramus inner margin with spines.  Middle and outer apical caudal setae fused at base.

Canthocamptus sp.