When is an aster not an aster? A new deep-sea Discorhabdella (Demospongiae, Poecilosclerida) with asters, from the Mozambique Channel

Type Article
Date 2018-08
Language English
Author(s) Vacelet Jean1, Cardenas PacoORCID1, 2
Affiliation(s) 1 : Aix Marseille Univ, Univ Avignon, CNRS, Stn Marine Endoume,IMBE,IRD, F-13007 Marseille, France.
2 : Uppsala Univ, Dept Med Chem, Pharmacognosy, S-75123 Uppsala, Sweden.
Source Zootaxa (1175-5326) (Magnolia Press), 2018-08 , Vol. 4466 , N. 1 , P. 197-204
DOI 10.11646/zootaxa.4466.1.15
WOS© Times Cited 2
Keyword(s) Porifera, new species, Madagascar, bathyal, homoplasy

Discorhabdella pseudaster n. sp. is an incrusting sponge from the upper bathyal zone of the 'Banc du Geyser', north of Madagascar, Mozambique Channel This new species is described only from a single specimen but it is remarkable by the presence of spicules similar to euasters, a type of microsclere unknown in Poecilosclerida. These spicules are in fact a new example of homoplasy, being derivatives of the typical Discorhabdella pseudoastrose acanthostyles, which are here reduced to the aster-like tyles. The isochelae with a large lamella on the shaft are also quite unique in Poeciloclerida.

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