Polymastia Bowerbank 1864 ...

• Main Authors: Plotkin, Alexander S., Janussen, Dorte
• Format: Text
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Hadromerida; Polymastiidae; Polymastia; Antarc*; Antarctic; Weddell Sea
• Online Access: https://dx.doi.org/10.5281/zenodo.6235790; https://zenodo.org/doi/10.5281/zenodo.6235790

Genus Polymastia Bowerbank, 1864 Diagnosis (emended from Boury­Esnault 2002): Thickly encrusting sponges of spherical, hemispherical or cushion shape, always with papillae. Choanosomal skeleton is composed by radial tracts of principal spicules between which free spicules are scattered. Cortical skeleton constituted by at least two layers, the superficial palisade of small tylostyles and the lower layer made of intermediary spicules, lying tangential to the surface. The principal spicules can be tylostyles, subtylostyles, styles, and strongyloxeas, intermediary spicules are most often tylostyles, and cortical spicules are always tylostyles. Remarks to diagnosis: At the moment 73 from 117 accepted polymastiid species are placed in Polymastia (van Soest et al. 2005), and some of them demonstrate noticeable discrepancies with the currently accepted diagnosis of the genus (see, e.g. Kelly­Borges & Bergquist 1997), that calls for its considerable re­evaluation. Since we did not aim to revise Polymastia in the ... : Published as part of Plotkin, Alexander S. & Janussen, Dorte, 2008, Polymastiidae and Suberitidae (Porifera: Demospongiae: Hadromerida) of the deep Weddell Sea, Antarctic *, pp. 95-135 in Zootaxa 1866 on pages 102-110, DOI: 10.5281/zenodo.183878 ...