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Issue: Vol. 1721 No. 1: 7 Mar. 2008
Type: Article
Published: 2008-03-07
DOI: 10.11646/zootaxa.1721.1.4
Page range: 53–64
Abstract views: 51
PDF downloaded: 20

Two new tretodictyids (Hexactinellida: Hexactinosida: Tretodictyidae) from the coasts of North America

Department of Biology, University of Victoria, P.O. Box 3020 Stn CSC, and Natural History Section, Royal British Columbia Museum, P.O. Box 9815, Stn. Prov. Govt., Victoria, British Columbia, V8W 9W2 Canada
Georg-August-Universität Göttingen, Geowissenschaftliches Zentrum Göttingen (GZG), Abteilung Geobiologie, Goldschmidtstr. 3, 37077 Göttingen, Germany
Harbor Branch Oceanographic Institution, Inc., Division of Biomedical Marine Research, 5600 North U.S. 1 Highway, Fort Pierce, FL, 34946 USA
Georg-August-Universität Göttingen, Geowissenschaftliches Zentrum Göttingen (GZG), Abteilung Geobiologie, Goldschmidtstr. 3, 37077 Göttingen, Germany
Porifera taxonomy hexactinellids sponges new species HBOI MBARI

Abstract

Two new species of the hexactinellid family Tretodictyidae, both collected by submersible, have been discovered off the coasts of North America. The Pacific species, Tretodictyum montereyensis n. sp., has an unusual skeleton with a fused cortex added over the usual tretodictyid system of ridges and grooves on the dermal surface. The Atlantic species, Hexactinella carolinensis n. sp., is unusual among its congeners in having swollen nodes on the dermal skeleton. Diagnoses of both genera have been modified to accommodate the new findings. The fine diactins of both species are found to have shallow brackets and short barbs, confirming their uncinate nature. Addition of these two species raises the number of known North American tretodictyids from one to three.

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