Spinularia spinularia (Bowerbank, 1866)

Fig. 13

Tethea spinularia Bowerbank 1866: 83, 94–96.

Radiella spinularia – Fristedt 1885: 16–17.

Spinularia spinularia – Stephens 1915: 31–32. – Alander 1942: 76.

Material examined (42 specimens)

SWEDEN • 2 specs; 57.6451° N, 11.6114° E; 71– 39 m depth; 24 Aug. 2006; Artprojektets Skagerrak-inventering leg. [SK51]; dredge; P069-111011-1 and P069-111122-5; voucher: GNM Porifera 781 • 1 spec.; 58.1345° N, 10.8012° E; 248–206 m depth; 25 Aug. 2006; Artprojektets Skagerrak-inventering leg. [SK58 (SK37 återbesök)]; dredge; P069-111011-2; voucher: GNM Porifera 782 • 3 specs; 58.7274° N, 10.5400° E; 134–126 m depth; 30 May 2006; Artprojektets Skagerrak-inventering leg. [SK 7]; dredge; P069-111011-3 to 5; voucher: GNM Porifera 780 • 1 spec.; 58.9628° N, 11.0229° E; 49–14 m depth; 24 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK96]; dredge; P069-111013- 1; voucher: GNM Porifera 788 • 1 spec.; 58.9537° N, 11.0189° E; 47–13 m depth; 24 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK94]; dredge; P069-111031-1; voucher: GNM Porifera 787 • 1 spec.; 58.3191° N, 10.9575° E; 111–91 m depth; 13 Jun. 2008; Artprojektets Skagerrak-inventering leg. [SK156]; dredge; P069-111107-1; voucher: GNM Porifera 796 • 1 spec.; 58.4728° N, 10.6203° E; 210–178 m depth; 16 Jun. 2008; Artprojektets Skagerrak-inventering leg. [SK181]; dredge; P069- 111122-1; voucher: GNM Porifera 966 • 3 specs; 58.5058° N, 10.6734° E; 179–147 m depth; 28 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK114]; dredge; P069-111122-9–11; voucher: GNM Porifera 789 • 3 specs; 58.9308° N, 10.9894° E; 34–18 m depth; 23 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK92]; dredge; P069-111122-12 to 14; voucher: GNM Porifera 786 • 7 specs; 58.4870° N, 10.4228° E; 348–326 m depth; 30 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK128]; dredge; P069-111122-15 to 21; voucher: GNM Porifera 792 • 2 specs; 58.1352° N, 11.2512° E; 51–46 m depth; 20 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK67]; dredge; P069-111122-2 and 3; voucher: GNM Porifera 964 • 1 spec.; 58.3772° N, 10.4784° E; 373–317 m depth; 30 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK129]; dredge; P069-111122-4; voucher: GNM Porifera 793 • 1 spec.; 57.9272° N, 11.2378° E; 102–100 m depth; 21 May 2007; Artprojektets Skagerrak-inventering leg. [SK65]; dredge; P069-111122-6; voucher: GNM Porifera 783 • 1 spec.; 58.6954° N, 10.8392° E; 64–42 m depth; 22 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK75]; dredge; P069-111122-7; voucher: GNM Porifera 785 • 1 spec.; 58.5068° N, 10.996° E; 70–38 m depth; 29 Aug. 2007; Artprojektets Skagerrak-inventering leg. [SK118]; dredge; P069- 111122-8; voucher: GNM Porifera 791 • 11 specs; 58.7295° N, 10.7331° E; 112–77 depth; 15 Jun. 2008; Artprojektets Skagerrak-inventering leg. [SK172]; dredge; P069-111128-1 to 10; voucher: GNM Porifera 965; same collection data as for preceding; P069-111128-13; voucher: GNM Porifera 967 • 1 spec.; 57.8331° N, 11.448° E; 66–42 m depth; 9 Jun. 2008; Artprojektets Skagerrak-inventering leg. [SK141]; dredge; P069-111128-11; voucher: GNM Porifera 794 • 1 spec.; 58.1151° N, 10.8574° E; 228–171 m depth; 12 Jun. 2008; Artprojektets Skagerrak-inventering leg. [SK144]; dredge; P069- 111128-12; voucher: GNM Porifera 795.

Description

The specimens have cushion or globular morphology. The colour pale brown when preserved in ethanol. Given the fact that the specimens were not observed, in situ, their natural colour is unknown. The oscula are visible on papillae. The surface is hispid (Fig. 13A).

Skeleton

The skeleton is clearly divided between the cortex (ectosome) and the choanosome (Fig. 13B). Its conformation is radial with a denser mass of tylostyles at the surface, creating the hispidation. Megascleres are: tylostyles with 170–1300 µm× 7.5×15 µm in size (N=7), and very thin oxeas/ trichodragmas, measuring 50.1– 71.5 –132.9 ± 17.37 µm (N=34) (Fig. 12C).