Comprehensive DescriptionRead full entry
“Plicatellopsis flabellata, sp.n. (Plate LVI, fig. 6; Figs. 36 c, 37 c).
Holotype. B.M. 18.104.22.1686.
Occurrence. St. WS 84: Falkland Islands, 75-74 m.
Diagnosis. Sponge irregularly flabellate, somewhat plicated; surface minutely tuberculate, markedly hispid; texture soft, friable; oscules and pores not apparent; colour, in spirit, brown; internal skeleton a confused mass of tylostyli, crossing each other at all angles, from which irregular fibres run vertically to surface; special dermal spicules in form of small styli; with long, slender tylostyli lying between ascending fibres of main skeleton; tylostyli of main skeleton usually much curved, 0•4 by 0•014 mm.; small styli of dermal skeleton, 0•2 by 0•003 mm.; long, slender, flexuous tylostyli, 2•0 by 0•01 mm.
Remarks. There is a marked relation between this species and P. expansa, Thiele (cf. Figs. 34 a, 35 a), and P. arborescens, sp.n., but it differs from both in external form, in the disposition of the skeleton and in having tylostyli in the main skeleton and small styli for dermal spicules.”