SYLLIDIAN
Syl*lid"i*an, n. Etym: [From NL. Syllis, the typical genus.] (Zoöl.)
Definition: Any one of numerous species of marine annelids of the family
Syllidæ.
Note: Many of the species are phosphorescent; others are remarkable
for undergoing strobilation or fission and for their polymorphism.
The egg, in such species, develops into an asexual individual. When
mature, a number of its posterior segments gradually develop into one
or more sexual individuals which finally break away and swim free in
the sea. The males, females, and neuters usually differ greatly in
form and structure.
Source: Webster’s Unabridged Dictionary 1913 Edition