Zoarium

a collection of distinct, individual zooids that make up a compound or colonial organism.
the supporting structure for a polyp colony; polyzoarium.
Historical Examples

This species is related to P. emarginata, from which it may be distinguished by the following characters:— zoarium.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The zoarium is of delicate appearance and branches sparingly.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The zoarium consists of a circular or oval mass of no great size.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

Major Walton found it growing over a zoarium of Hislopia lacustris.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The arrangement of the polypides in the zoarium and the general structure of the statoblasts are very similar in the two species.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

A zoarium with its included polypides is finally produced from the young polypide by the rapid development of buds.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

It possesses a creeping “sole” or organ of progression at the base of the zoarium.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The zoœcia are not distinct from one another, but in dendritic forms the zoarium is divided irregularly by chitinous partitions.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The zoarium consists primarily of a main axis running in a straight line, with lateral branches that point forwards and outwards.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The zoarium as a whole is either recumbent and adherent or at least partly vertical.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale