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Mediterranean Bioconstructions Along the Italian Coast 69

Fig. 2 (A) L. byssoides formations in the intertidal zone. The orange coral A. calycularis
can also be found immediately below if the environmental conditions are suitable.
(B) Occurrence and distribution of L. byssoides and (C) of A. calycularis along the Italian
coast. Points represent data with no associated surface area. Boundaries of points of the
data layers are enhanced for illustrative purposes and do not reflect the real habitat
extent. Panel (A): Alberto Gennari.
bioconstruction. The polychaete Spirorbis infundibulum Harris & Knight-Jones,
1964 is exclusive to this habitat (Bianchi, 1981).
L. byssoides is not rare along Italian shores. Most frequently, however, it
occurs as separate, noncoalescing individual thalli. Build-ups and large rims