dibranchia's Usage Examples:

Where the modification is carried to its extreme degree, not only the shell but the pallial cavity, ctenidium and visceral hump disappear, and the body acquires a simple elongated form and a secondary external symmetry, as in Pterotrachaea and in Doris, Eolis, and other Nudibranchia.

The genital duct is now said to be diaulic, as in Valvata, Oncidiopsis, Actaeon, and Lobiger among the Bullomorpha, in the Pleurobranchidae, in the Nudibranchia, except the Doridomorpha and most of the Elysiomorpha, and in the Pulmonata.

Herdman, " On the Structure and Functions of the Cerata or Dorsal Papillae in some Nudibranchiate Mollusca," Quart.

Synonyms:

order Belemnoidea, Octopoda, subclass Dibranchiata, Cephalopoda, class, order Octopoda, subclass Dibranchia, Belemnoidea, Decapoda, class Cephalopoda, order Decapoda, Dibranchiata,

Antonyms:

inelegance,