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Boury-Esnault & van Beveren, 1982

Definition: Marine Haplosclerida with an isotropic choanosomal skeleton lacking differentiation in primary and secondary fibers or tracts; spicules smooth oxeas and/or strongyles, often in more than a single category.

Remarks: Taxa included in this suborder are usually incompressible or hard, have a high spicular density and little or no spongin. A few groups have sigmas and/or toxas. Brooded larvae are unknown, presumably all are oviparous. Three families, Petrosiidae, Phloeodictyidae and Calcifibrospongiidae.

Source: van Soest & Hooper, 2002c.

Families represented in the area:
Family Petrosiidae: skeletal tracts forming isotropic, often even alveolar, meshes; consistency hard; ectosomal skeleton consists of single spicules intercrossing (Petrosia crassa drawings).

Family Phloeodictyidae: single spicule reticulation strengthened by directionless thick spicule tracts; ectosomal skeleton crust-like (Oceanapia robusta draw).

Suborder Petrosina