Heterobranch (Opisthobranch) Field Guide: Eastern Pacific

Displayed and alphabetized according to scientific name. "Opisthobranchia as previously used was found to be polyphyletic and so a new name [clade, heterobranchia] was needed. Part of this stemmed from the closer position of the Sacoglossa to the pulmonates than to other sea slugs." Comment thanks to Dr. Jeffrey Goddard, UC Santa Barbara.