Stylissa massa OTU QM0925

Scopalinida Scopalinidae

External characters

Massive, varying from bulbous encrusting to digitate or flabellate-digitate, thick irregular digits.

Colour

Bright yellow or orange/yellow alive, may be darker red-orange-yellow on deck.

Skeletal Characters

Oscules On sides of digits, prominent, irregular.In encrusting growth forms single apical oscules sit on the ends of bulbous processes
Texture Firm, slightly compressible.
Surface_Ornamentation Straited, irregularly ornamented, grooves, conules.
Ectosomal_Skeleton membranous, with tips of peripheral spicules protruding and producing a microscopically hispid, and macroscopically conulose surface (the latter only slight however). Spicule tracts are more plumose near peripheral skeleton than in the choanosomal skeleton
Choanosomal_Skeleton Sinuous-plumose tracts of styles, no fibres, halichondroid near the centre of the skeleton, mesohyl ranges from light to heavy collagen depending on thickness of lamellae/ digits.
Megascleres Styles, straight, curved or sinuous, robust (500 -550 x 15 -20um).
Microscleres nil.
Mudmap_Author J Hooper
Mudmap_Editor K Hall

Distribution

In French Polynesia: Marquesas islands

Ecology and habitat

In a bay, on fringing reef / rocky slope.