zooid


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Related to zooid: gastrozooid

zooid

1. any independent animal body, such as an individual of a coelenterate colony
2. a motile cell or body, such as a gamete, produced by an organism

zooid

[′zō‚ȯid]
(invertebrate zoology)
A more or less independent individual of colonial animals such as bryozoans and coral.
References in periodicals archive ?
Once the extending pharyngeal basket has joined the stomach and started to produce its first stigmata, the stereotypical body plan of the zooid is completed, thus becoming a first-generation bud on which new budlets start to appear (day 9; Fig.
Botryllid colonies, like all colonial ascidians, consist of individual feeding and reproductive units called zooids that are encased in a common outer covering, the tunic.
Botryllus schlosseri is a cosmopolitan colonial ascidian that undergoes cyclical generation changes, or takeovers, during which adult zooids are resorbed and replaced by their buds.
Coloniality and inducible polymorphism: the interaction of zooid and colony level control.
Colonies are composed of numerous asexually produced zooids organized into systems (typically 7-10 zooids/system), with up to 100 systems comprising a colony.
These crystals are incorporated into the zooid walls as spheres, which may coalesce and develop into threads (Ryland, 1976) and eventually many other ultrastructural forms (see, e.g., Sandberg, 1977).
Hosts carrying a single zooid were transferred to glass Petri dishes (147 mm in diameter) filled with 150 mL of < 0.45 [micro]m 15 psu water, enriched with varying amounts of Cerophyl [R] to reach different bacterial concentrations.
These juveniles were both at the single zooid stage while 98% of the juveniles in the controls had progressed to the two-zooid stage.
Other studies have confirmed higher concentrations of bryostatins on larvae (~10 X), as well as in zooids with ovicells (~3 X) compared to zooids with no ovicells (Lopanik et al., 2004, 2006).
However, the relationships among these components of variance in zooid morphology have not been evaluated in detail.
For consistency with methods used in quantitative genetics, within-colony zooid data were treated as replicate measurements, and colony means were used to calculate phenotypic variance-covariance matrices, P (Cheetham et al.