Paratimea dentata, 2019

Morrow, Christine, Cárdenas, Paco, Boury-Esnault, Nicole, Picton, Bernard, Mccormack, Grace, Soest, Rob Van, Collins, Allen, Redmond, Niamh, Maggs, Christine, Sigwart, Julia & Allcock, Louise A., 2019, Integrating morphological and molecular taxonomy with the revised concept of Stelligeridae (Porifera: Demospongiae), Zoological Journal of the Linnean Society 187, pp. 31-81 : 50

PARATIMEA DENTATA MORROW SP. NOV.

( FIG. 6A–F)

Material examined: Holotype BELUM Mc6884, Les Dents, Channel Isles, 49°25.5270′N, 2°23.7130′W, 26 m, 28 June 2010, coll. B. Picton.

LSID: urn:lsid:zoobank.org:act:ED7CD719-53D1-4B74-8C40-145FEA6850E6

Description: Outer morphology: Thinly encrusting, with a hispid surface ( Fig. 6E).

Colour: Bright yellow; Methuen colour code 3A4 ( Kornerup & Wanscher, 1978; Fig. 6E).

Choanosomal skeleton: Hymedesmoid arrangement, consisting of erect, long tylostyles and ascending bundles of centrotylote oxeas scattered throughout the skeleton ( Fig. 6F). Cells with granular inclusions are abundant throughout the choanosome.

Ectosomal skeleton: Bundles of centrotylote oxeas penetrate the surface, giving it its hispid appearance; oxyasters are common in the surface layer.

Megascleres: Tylostyles–subtylostyles, 1660– 1890 – 2100 µm × 8–10 µm (N = 4); the base is 13–16 µm ( Fig. 6A).

A c c e s s o r y o x e a s: C e n t r o t y l o t e o x e a 3 7 0– 4 1 2 – 460 µm × 2–4–5 µm; centrotylote swelling 3.0–5.7– 7.6 µm ( Fig. 6B). Both ends of the oxea are dentate, with approximately six ‘teeth’ ( Fig. 6C).

Microscleres: Microscleres are smooth oxyasters, 15– 17 –19 µm in diameter; the diameter of the centrum is ~6 µm. In the SEM of the aster ( Fig. 6D), 23 conical rays are visible.