FIG. 2 in Bertorsonidra n. gen. (Bryozoa, Cheilostomata) for Tremopora prenanti Gautier, 1955, a rare species from the Mediterranean

FIG. 2. — Bertorsonidra prenanti (Gautier, 1955) n. comb., living specimens from the Egadi Islands (Western Sicily):A, F-H, sample ELE.7, 17 m depth, Cape Grosso, North of the Levanzo Island; B-E, sample EBE.4, 19 m, South of Bassana Point, Marettimo Island (PMC R. I. H. B9a); A, untreated sterile zooids lacking avicularia seemingly from near the periancestrular area, large interzooidal lacunae are obvious and two often asymmetrical spines are present distal to each orifice; B, sterile zooids mostly with an avicularium lateroproximally located to the orifice, note the variability in the number of orificial spines; C, primary orifice; D, communication pores in lateral walls of broken zooids, and pillar-like rhizoidal projections emanating from the basal surface; E, some zooids with an ovicell; F, uncleaned ovicellate zooids, note the persistence of the two slender spines; G, the only observed zooid with twin avicularia; H, distal part of a zooid with its protruding suboral umbo and an incompletely formed ovicell. Scale bars: A, B, E, 500 μm; C, 100 μm; D, F-H, 200 μm.