Poriferans are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other metazoans. As one would expect based on their phylogenetic position, fossil sponges are among the oldest known animal fossils, dating from the Late Precambrian. Since then, sponges have been conspicuous members of many fossil communities; the number of described ...

Welcome to the Khoyatan Sponge Page Sponges of the northeast Pacific Calcarea | Hexactinellida | Demospongiae | References Khoyatan Marine Laboratory houses a moderately large collection of NE Pacific Sponges. This material has been worked on by Bill Austin and Bruce Ott. A list of 260 species from central California to southern Alaska is recorded by Austin (1985). Approximately 30 additional ...

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