Zona: a belt or zone; as of distribution.
Zonite: = arthromere or somite; q.v.
Zoönite or Zoönule: = zonite.
Zygoptera: those Odonata, having the fore and hind wings subequal in width, venation comprising a quadrilateral, not a triangle; nymphs with caudal tracheal gills.
Calacobiosis: see symbiosis.
Cleptobiosis: see symbiosis.
Dulosis: see symbiosis.
Coxal file: in some aquatic Coleoptera a series of striations just above the hind coxa of male and, perhaps, a stridulating organ.
Coxal plates: plate-like expansions or dilations of the coxa: specifically in aquatic Coleoptera on the posterior pair.