Notes: Dark red, brown to purple or violet barrels-thick tubes, single or in groups, with a transparent collar lining the oscules/atria. Surface is spinuous owing to arising fibers. Its mucosy tissue sloughs off when handled, staining the fingers. It may also be encrusting or fill cavities in crevices. It may be confused with Clathria spinosa Wilson, 1902, also pictured here, but the latter is stiffer and has a much spinuous surface. The lack of the microsclere spicule complement in specimens from certain areas generated many synonyms (see World Porifera Database; van Soest et al., 2009).
Author Reference: (Duchassaing & Michelotti, 1864)
Link: World Porifera Database