monophyidæ

from The Century Dictionary.

• A family of calyconectous siphonophorans, having a single nectophore at the apex of the long tubular stem, the cormidia eudoxiform, separated by equal free internodes, and each siphon with a bract. It includes, among othergenera, Monophyes, Cymba, and Sphæronectes.