When is an aster not an aster? A new deep-sea Discorhabdella (Demospongiae, Poecilosclerida) with asters, from the Mozambique Channel
|Author(s)||Vacelet Jean1, Cardenas Paco1, 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|
|WOS© Times Cited||1|
|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.