WAplysina cavernicola is a species of sponge in the family Aplysinidae. It is native to the Mediterranean Sea where it grows in caves and under overhangs.
WBalaustium medicagoense is a species of mite belonging to the family Erythraeidae. This large, densely hairy mite is up to 1.6 mm in length with one pair of eyes set well back on the body. The first pair of legs is just longer than the body.
WBrissopsis caparti is a species of sea urchins of the Family Brissidae. Their armour is covered with spines. Brissopsis caparti was first scientifically described in 1959 by Cherbonnier.
WPolycyathus muellerae is a small species of coral in the family Caryophylliidae in the order Scleractinia, the stony corals. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea. It is a large polyp, colonial coral and grows under overhangs and in caves as part of an assemblage of organisms suited to these poorly-lit sites.
WPseudoceros ferrugineus, the Fuchsia flatworm, is a marine flatworm species that belongs to the Pseudocerotidae family.
WThysanozoon nigropapillosum is a species of polyclad flatworms belonging to the family Pseudocerotidae. Some common names include gold-speckled flatworm, marine flatworm, yellow papillae flatworm, yellow-spotted flatworm, and yellow-spotted polyclad flatworm.
WTribrachidium heraldicum is a tri-radially symmetric fossil animal that lived in the late Ediacaran (Vendian) seas. In life, it was hemispherical in form. T. heraldicum is the best known member of the extinct group Trilobozoa.