Tylosigma Topsent, 1894,
Van, Rob W. M., 2017, Sponges of the Guyana Shelf, Zootaxa 1, pp. 1-225: 128
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http://doi.org/ 10.5281/zenodo.272951 |
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lsid:zoobank.org:pub:6D68A019-6F63-4AA4-A8B3-92D351F1F69B |
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persistent identifier |
http://treatment.plazi.org/id/03A80010-7728-FFD3-FF14-A7EE934AFA7A |
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Plazi |
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Tylosigma Topsent, 1894 |
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Genus Tylosigma Topsent, 1894
Remark. The genus Tylosigma was synonymized with Hymedesmia ( Hymedesmia ) in the Systema Porifera (chapter Hymedesmiidae by Van Soest 2002b), but it is here proposed to be revived as a valid genus. The discovery of a second species with similar characters as the type species H. campechiana Topsent, 1889 , and the considerable difference with Hymedesmia s.s. (no tornotes, no echinating acanthostyles) support the valid status. The definition of the genus Tylosigma needs emendation from Topsent’s original definition: Desmacellidae (?) with single tylostyles erect on the substratum, pointed ends outwardly directed, and with sigmas as microscleres.
Type species Hymedesmia campechiana Topsent, 1889 .
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