Sphinctozoa

Sphinctozoa

[‚sfiŋk·tə′zō·ə]
(paleontology)
A group of fossil sponges in the class Calcarea which have a skeleton of massive calcium carbonate organized in the form of hollow chambers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sphinctozoa

 

a class of extinct animals conventionally assigned to the phylum Porifera. The Sphinctozoa lived from the Carboniferous to the end of the Cretaceous. They included both solitary and colonial forms measuring about 20 cm in height. The calcareous, porous skeleton is in the form of a cube or cylinder. The internal cavity is divided into separate chambers by horizontal septa. Some species have a tube that isolates the central cavity. Vesicular tissue may be found in the chambers and central cavity. The Sphinctozoa included about 30 genera.

REFERENCE

Osnovy paleontologii. Moscow, 1962.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.