Fig. 6. Cliona patera. (A) Oscular papillae on the top surface of
disk. . Scale bar = 1 cm; (B) Ostial papillae on the under side
surface of disk. Scale bar = 1 cm.
tylostyles lying tangentially beneath (Fig. 7B). The cortical
skeleton is an extension of the tylostyle tracts from the
choanosomal skeleton. In the choanosomal skeleton, vague
pauspicular tracts, loose spicules and collagen surrounded
the thick and widely spaced tylostyle tracts (Fig. 7C).
Spicules. — Tylostyle megascleres are long, slim and
sometimes bent. Subterminal swellings are observed in some
tylostyles (Fig. 7D). Tylostyles in: 1) disk, 300–420.7–490 μm
x 6–10.1–13 μm; 2) stalk, 205–377.4–480 μm x 8–11.5–13
μm; 3) rooting process, 210–358.4–480 μm x 7.5–10.3–13
μm. Microscleres absent.
Ecology. — The two Cliona patera in this study were found
at 10-12 m depth, about 10 m apart from each other, and
were in an area subjected to strong tidal currents of up to
3 knots. The sponge stands upright with the disk facing up,
supported by a stalk. The main body was fi rmly anchored