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Two New Lower Paleozoic Hexactinellid Sponges from Utah and Oklahoma

J. Keith Rigby and Raymond C. Gutschick
Journal of Paleontology
Vol. 50, No. 1 (Jan., 1976), pp. 79-85
Stable URL: http://www.jstor.org/stable/1303640
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Two New Lower Paleozoic Hexactinellid Sponges from Utah and Oklahoma
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Abstract

Hintzespongia bilamina, n. gen. and sp., from the Middle Cambrian of Utah, and Dierespongia palla, n. gen. and sp., from the Ordovician Bromide Formation of Oklahoma show double layered skeletons and are placed in the new Family Dierespongiidae. Both have an outer, thin, regularly arranged, roughly to well defined quadruled layer of stauracts in the Cambrian form and of stauracts and hexacts in the Ordovician one, and both have an inner layer or sponge body composed of irregularly spaced and arranged hexacts and stauracts. Parietal gaps are present in the inner irregular layer of the Cambrian sponge but are not evident in the Ordovician one. Their skeletal arrangements have the regularity characteristic of Protospongiidae in the outer layer and irregularity somewhat like that of the Teganiidae or of the Brachiospongioidea in the inner part. They appear to be structurally transitional between these large groups of Paleozoic sponges, and indicate that the regular patterned skeleton of at least early protosponges, and probably later Paleozoic dictyosponges as well, was of dermal origin and that the irregular skeleton of the brachiosponges and teganiid sponges was of parenchymal origin.

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