Haliclona indistincta (Bowerbank, 1866)


Family : Chalinidae

Form: Thin sheets to cushions, forming patches from a few cms to 20-25cm across.

Colour: Greenish brown, pinkish white.

Consistency: Softly friable.

Surface: Strongly punctate, slightly irregular and shaggy, with clearly visible exhalent canals converging on the oscules.

Apertures: Oscules are few, irregularly scattered, not or only slightly elevated; circular 1.5-3mm diameter.

Contraction: Not noticeable.

Internal characters

Skeleton: There is no ectosome. The choanosomal skeleton is a close meshed isotropic reticulation, with multispicular (ca. 3-9 spicules wide) primary and unispicular secondary tracts. Other spicules are randomly scattered. There is very little spongin, confined to the nodes.

Spicules: Megascleres are rather slender, fusiform oxea, 110-150 x 3-7.5Ám. Microscleres are absent.

Habitat: Found mainly on the undersides of intertidal boulders.

Distribution: Known from Strangford Lough, south and west coasts of Ireland, Hastings, Dorset, N. Cornwall, Anglesey, Orkney, Roscoff.

Distribution Map: NBN map : National Biodiversity Network mapping facility, data for UK.

Identity: A renieroid skeleton without an ectosome, with multi-spicular primary bundles, in an encrusting soft shore sponge with oscular channels is diagnostic for this species. Apparently, however, its name was not given lightly!

Editors: D. Moss, B.E. Picton.

 Picton, B.E., Morrow, C.C. & van Soest, R.W.B., 2011. [In] Sponges of Britain and Ireland