Source : Webster's Revised Unabridged Dictionary (1913)

Reptantia \Rep*tan"ti*a\ (r?p-t?n"sh?-?), n.pl. [NL.] (Zo["o]l.)
   A divisiom of gastropods; the Pectinibranchiata.

Source : WordNet®

Reptantia
     n : lobsters; crabs [syn: {suborder Reptantia}]