coeloblastula

Etymology
From.

Noun

 * 1) A hollow blastula formed from blastomeres.
 * 2) * 2008, Tracey Irene Smart, Reproductive and Larval Biology of the Northeastern Pacific Polychaete Owenia collaris (Family Oweniidae) in Coos Bay, OR (page 8)
 * Eggs can either be very yolky and produce stereoblastulae or have little to no yolk and produce coeloblastulae.