Project 112: P. Cárdenas, J. Xavier, O. S. Tendal, C. Schander, H. T. Rapp. 2007. Redescription and resurrection of Pachymatisma normani (Demospongiae: Geodiidae), with remarks on the genus Pachymatisma. Journal of the Marine Biological Association of the United Kingdom. 87 (6):1511-1525.
Specimen: Erylus geodiformis (ZMA/POR 5269)


An increasing number of cryptic species are being discovered within sponges with assumed wide geographical distribution. Pachymatisma johnstonia (Bowerbank in Johnston, 1842) (Astrophorida, Geodiidae) is one of the most common and known sponges throughout the North-East Atlantic coasts. Pachymatisma normani Sollas, 1888 is a northern species previously synonymized with P. johnstonia by Topsent. It is here redescribed on the basis of fresh material from the type locality, the Korsfjord in the Bergen area (Norway). Spicules are shown to be reliable characters to distinguish the species investigated. P. normani is characterized by larger spicules, most markedly in the sterrasters. Our observations also suggest that habitat and gross morphology distinguish P. johnstonia from P. normani. Furthermore, using a partial sequence of the cytochrome c oxidase subunit I (COI) and an ITS1-5.8-ITS2 nuclear fragment, we show that consistent genetic differences exist between the two species. A brief overview of the genus and a key to the known species are also given.

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Project DOI: 10.7934/P112,
This project contains
  • 27 Media
  • 3 Taxa
  • 17 Specimens
Total size of project's media files: 15.03M

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MorphoBank Project 112
  • Creation Date:
    10 April 2007
  • Publication Date:
    10 April 2007
  • Project views: 37036

    Authors' Institutions

    • Copenhagen University

    • Universiteit van Amsterdam (University of Amsterdam)

    • University of Bergen

    • Natural History Museum of Denmark


    member name taxa specimens media media
    Paco Cardenas
    Project Administrator
    Hans Tore Rapp
    Full membership
    Christoffer Schander
    Full membership
    Ole Secher Tendal
    Full membership
    Joana Xavier
    Full membership

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