Siphonobranchiata /(?)/

Si·pho·no·bran·chi·a·ta

Siphonobranchiata

n. pl.
  1. A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group. (Zool.)