which are produced from the antero-ventral wall of the parent zooid
This suggests substantial similarity in adult zooid
cell and tissue homeostasis between these two distantly related species.
First, each week, each zooid
gives rise to multiple motile larvae; however, the dispersal range is very short, on the order of 1 m (Grosberg, 1987).
subtorquata; we also predicted that connection numbers per zooid
would increase with colony size in both species.
Prior to their dislodgement from the weighing dish, all of these individuals were observed to be either simply ancestrulae with a regressed polypide or ancestrulae with but a few budded zooids
Effect of zooid
spacing on bryozoan feeding success: is competition or facilitation more important?
Frequently, several zooids
in the center of a chimney do not extend their lophophores and do not feed (Lidgard, 1981).
Within this reorganized tissue, regeneration niches--discrete regeneration loci within the vascular system--will develop and apparently compete through a yet-undetermined process that ultimately leads to the development of a single adult zooid
, while all other niches are absorbed by the colony (Fig.
Solitary ascidians; each zooid
enclosed in 2 its own tunic Colonial ascidians; multiple zooids
within a 6 common tunic or connected by stolons 2.
This photographically well-documented research report describes the development of an unusual telotroch (the free-swimming, re-colonizing stage) from a zooid
that was broken-off from a spasmoneme-bearing, colonial, contractile, stalked Peritrich protozooan.
Siphonophores have gas-filled spheres in the upper zooid
of the colony that maintain them permanently and almost effortlessly in suspension.
and colony growth in encrusting cheilostome bryozoans.