Unique envelope of a jellyfish ovum: the armed egg.
The eggs of Bougainvillia multitentaculata are spawned with an envelope consisting of a single layer of cnidocvtes. The cnidocytes are surficial On eggs, cleavage stages, and young blastulae. During gastrulation, the cnidocytes are Incorporated intO the ectoderm and become an integral part of the planula.
D000818:Animals; D002454:Cell Differentiation; D002465:Cell Movement; D003063:Cnidaria / Q000196:embryology*; D005260:Female; D005854:Germ Cells; D010063:Ovum / Q000166:cytology*