Middle Ordovician – Late Permian
Rugosa is an extinct subclass of stationary, epifaunal, suspension feeders.
Characteristics of the subclass
- Highly distinctive, conical shape
- Septa present
- Bilaterally symmetrical
- Generally solitary
- Solitary or compound epithecate corals with septa typically in two orders alternating in length but in some with three or four orders; symmetry bilateral; in solitary corallites, and in many offsets, with metasepta inserted in four positions only, on the counter side of each alar septum and on each side of the cardinal septum. A marginarium, consisting of a dissepimentarium or a peripheral sterozone formed by thickening of the septa, may be developed around the tabularium in the zone of minor septa. Tabulae may be conical, domed, horizontal, sagging (in some with a median trough), or inversely conical; each tabula may be complete, consisting of one plate, or incomplete, consisting of a number of tabellae. An axial structure may develop.
Stauriida (Verrill, 1865) is an extinct order stationary epifaunal suspension feeders
- Fasciculate or cerioid with marginarium a narrow stereozone and in some with sporadic elongate dissepiments
- Septa laminar, not lobed or acanthine axially
- Tabulae commonly complete
- Cincinnatian families within this order include Streptelasmatidae