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faculty: "FNWI" and publication year: "2007"
| Authors||P. Cárdenas, J. Xavier, O.S. Tendal, C. Schander, H.T. Rapp|
|Title||Redescription and resurrection of Pachymatisma normani (Demospongiae: Geodiidae), with remarks on the genus Pachymatisma.|
|Journal||Journal of the Marine Biological Association of the United Kingdom|
|Faculty||Faculty of Science|
|Institute/dept.||FNWI: Zoological Museum Amsterdam (ZMA)|
|Keywords||Cryptic species; North-east Atlantic; Pachymatisma.|
|Abstract||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. Pachymatisma 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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