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1a. Solitary or colonial; body undivided or divided into two or three regions; branchial sac without folds; gonads unpaired, in or below gut loop; common sperm duct, and usually oviduct, accompanying rectum.

Order Enterogona
1b. Solitary or colonial; body undivided; branchial sac with or without folds; gonads lateral in mantle wall; no common sperm duct or oviduct accompanying rectum.

Order Pleurogona
Suborder: Stolidobranchia
Choices made: 0
Remaining: 34
Excluded: 0
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