SINCE 1828
Aspidobranchia
plural noun
As·pi·do·bran·chia
| \ -ˈbraŋkēə\
Definition of Aspidobranchia
: an order of Streptoneura comprising marine gastropods having the nervous system only slightly concentrated, usually exhibiting clear traces of ancestral bilateral symmetry, with two kidneys and two auricles, and including the limpets and other primitive forms
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