nematogene

from The Collaborative International Dictionary of English v.0.48

Nematogene \Nem"a*to*gene\, n. [Nemato- + root of Gr. ? to be
   born.] (Zool.)
   One of the dimorphic forms of the species of Dicyemata, which
   produced vermiform embryos; -- opposed to {rhombogene}.
   [1913 Webster]