FIGURE 4 in Coping with brackish water: A new species of cave-dwelling Protosuberites (Porifera: Demospongiae: Suberitidae) from the Western Mediterranean and a first contribution to the phylogenetic relationships within the genus

FIGURE 4. Protosuberites mereui sp. nov. Resting bodies (gemmule-like). A. Suboval resting body (LM) with a flat base and unarmed protective theca filled by a mass of totipotent cells (centre); empty theca of transparent spongin (left). A1. Theca of sublayered compact spongin and a single, distal, evident foramen bearing a well-developed collar (LM). B. Schematic drawing of a resting body (lateral view). B1. Foramen detail with protruding collar (top), and closed foramen lacking collar (bottom). B- B1 by courtesy of R. Pronzato.