Axinyssa djiferi, Boury-Esnault & Marschal & Probst & Barnathan, 2002

Boury-Esnault, Nicole, Marschal, Christian, Probst, Jean-Michel Korn- & Barnathan, Gilles, 2002, A new species of Axinyssa Lendenfeld, 1897 (Porifera, Demospongiae, Halichondrida) from the Senegalese coast, Zootaxa 117, pp. 1-8 : 4-5

publication ID

https://doi.org/ 10.5281/zenodo.4620114

DOI

https://doi.org/10.5281/zenodo.4620118

persistent identifier

https://treatment.plazi.org/id/0D02EF21-FF86-FFC8-FE89-FEE1CE189DBE

treatment provided by

Plazi

scientific name

Axinyssa djiferi
status

sp. nov.

Axinyssa djiferi sp. nov.

Material examined: 24.4.83 DAK­52 , at low tide in the mangrove swamp of Saloum which is designated as the type specimen and deposited in the MNHN under the number: MNHN . Several specimens from the same locality in the authors’ collection.

Morphology ( Fig. 1 View FIGURES 1 ­ 3 ): The holotype forms a sleeve around the roots of the mangroves close to the bottom. The dimensions are about 10 cm in length and 1­3 cm in thickness. The live specimens have a black surface, and the choanosome is yellow greenish. The surface is raised by conules which are hispid. The surface between the conules is smooth. The consistency is soft. The oscules (3­4 mm in diameter) are clearly visible at the top of fistules of about 1.5­ 2 cm height and 1 cm diameter at the base ( Fig. 2 View FIGURES 1 ­ 3 ). The others specimens are very similar to the type­specimen. The type specimen, collected in April, is in reproduction and shows a wide range of oocytes and embryos from 15 to 20 µm in diameter especially abundant at the base ( Figs. 3­4 View FIGURES 1 ­ 3 View FIGURES 4 ­ 5 ). The sponge is thus viviparous.

Skeleton ( Figs. 3 View FIGURES 1 ­ 3 , 5 View FIGURES 4 ­ 5 ): Choanosomal skeleton ( Fig. 3 View FIGURES 1 ­ 3 ) composed of ascending tracts of about 50 to 100 µm in diameter which rise the surface. The spicule tracts end in brushes at the surface conules. Single spicules are present between the tracts. In the ectosome, the smallest oxeas constitute the brushes and form a tangential skeleton between the brushes ( Fig. 5 View FIGURES 4 ­ 5 ).

Spicules ( Figs. 6, 7 View FIGURES 6 ­ 7 ): Oxeas of the choanosomal tracts are slightly curved, with two regular acerate extremities, and with a clearly visible axial canal ( Fig. 6 View FIGURES 6 ­ 7 ); some of these oxeas are styloid ( Fig. 7 View FIGURES 6 ­ 7 ): 281­567/10.6­26.5 µm (mean 418±74/13.6±4.5 µm). Oxeas of the ectosome are straight and acerate ( Fig. 6 View FIGURES 6 ­ 7 ): 101­233/5.3­10.6 µm (mean 147±31/6±1.8 µm).

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