Reef-associated; depth range 0 - 25 m (Ref. 122)
Climate / Range
Mean live weight: 1000-2500 g. Body-wall thickness: 0.8 cm. Body firm, rigid, square-ish in cross-section, flattened ventrally (trivium). Body wall easily disintegrates outside seawater. Bivium covered with irregular conical warts, arranged in 8 longitudinal rows, with smaller papillae in between. Trivium with yellow to pink podia, arranged in rows on the radii, their disc about 380 micrometer in diameter. Mouth ventral, surrounded by a circle of conical papillae, small interradials. Cuvierian tubules absent. Color variable on bivium, yellow to greenish, with black spots; trivium lighter. Spicules with tables in the tegument with 2 forms of discs, some being undulated, with 8 to 20 holes, while others form a denticulate disc with 4 central holes and a variable number of peripheral holes; spire of tables with 4 pillars ending in a moderately spiny perforated crown; some tables with large disc and irregular crown also present; tables in papillae have a very large multiperforated disc; rosettes cross-shaped, branching; X-shaped spicules occur in 3 different sizes; ventral podia with spiny rods and large multiperforated plates showing pentagonal holes; tentacles with long, narrow, and spiny rods and X-, S-, and C-shaped small spicules.
Fisheries: minor commercial
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Estimation of some characteristics with mathematical models