The asexual stock, after budding off one asexual zooid, elongates again and buds off a second zooid.
From this bud is developed the first zooid and first serial theca of the colony.
A, Schematic longitudinal section through a zooid and bud of Stylophora digitata.
Mr. Busk, however, does not know of any gradations now existing between a zooid and an avicularium.
zooid zo·oid (zō'oid')
An organic cell or organized body that has independent movement within a living organism, especially a motile gamete such as a spermatozoon.
An independent animallike organism produced asexually, as by budding or fission.
One of the distinct individuals forming a colonial animal such as a coral.