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Class Hexactinellida Schmidt, 1870

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Systema Porifera

Abstract

Hexactinellida Schmidt (Porifera) are deep-water marine sponges defined by their production of siliceous spicules of hexactinic, triaxonic (cubic) symmetry, or shapes clearly derived from such forms by reduction of primary rays or terminal branches added to the ends of primary rays. They lack calcareous minerals and sclerified organic spongin as skeletal components. Siliceous spicules may be entirely loose, or partially fused to form a rigid basal and choanosomal framework. Their living tissues are mainly syncytial, with distinctive porous plugs joining differentiated regions of the syncytium to each other or to discrete cellular components. Flagellated-collar units are anucleate. Hexactinellids are viviparous and, from detailed study of a single species, produce distinctive trichimella larvae. Two subclasses are recognized by different microsclere forms — amphidiscs and hexasters. Hexactinellids include about 500 described species, 7% of all Porifera, distributed in 5 orders, 17 families and 118 genera.

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  1. Natural History Section, Royal British Columbia Museum, 675 Belleville Street, Victoria, British Columbia, Canada, V8W 9W2

    Henry M. Reiswig

  2. Biology Department, University of Victoria, P.O. Box 3020 STN CSC, Victoria, British Columbia, Canada, V8W 3N5

    Henry M. Reiswig

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  1. Henry M. Reiswig
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  1. Queensland Museum, South Brisbane, Queensland, Australia

    John N. A. Hooper

  2. Zoological Museum, University of Amsterdam, Amsterdam, Netherlands

    Rob W. M. Van Soest

  3. Royal Institute of Natural Sciences of Belgium, Brussels, Belgium

    Philippe Willenz

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© 2002 Kluwer Academic / Plenum Publishers, New York

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Reiswig, H.M. (2002). Class Hexactinellida Schmidt, 1870. In: Hooper, J.N.A., Van Soest, R.W.M., Willenz, P. (eds) Systema Porifera. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0747-5_123

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  • DOI: https://doi.org/10.1007/978-1-4615-0747-5_123

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-0-306-47260-2

  • Online ISBN: 978-1-4615-0747-5

  • eBook Packages: Springer Book Archive

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