tubulibranchiata

from The Collaborative International Dictionary of English v.0.48

Tubulibranchiata \Tu`bu*li*bran`chi*a"ta\, n. pl. [NL., from L.
   tubulus a little tube + branchia a gill.] (Zool.)
   A group of gastropod mollusks having a tubular shell.
   Vermetus is an example.
   [1913 Webster]