Order: Trepostomatida (Ulrich, 1882)
Cincinnatian Families: Aisenvergiidae, Amplexoporidae, Atactotoechidae, Batostomellidae, Halloporidae, Heterotrypidae, Mesotrypidae, Monticuliporidae, Trematoporidae, Unassigned Genera
Early Ordovician – Late Triassic (or Recent?)
Trepostomida is an extinct order of stationary epifaunal suspension feeders
Characteristics of the Order
- Zoaria usually massive, lamellate, or stemlike
- Autozooids containing basal diaphragms and commonly other lateral structures
- Zooecia consist of long calcareous tubes, generally intersected by many partitions
- Kenozooids common, extrazooidal skeleton in some
- Colonies encrusting or erect; autozooids generally containing basal diaphragms and commonly other lateral structures; kenozooids common, extrazooidal skeleton in some; skeletons without communication pores, typically laminated. Lower Ordovician to Upper Triassic (or Recent?).
Treatise on Invertebrate Paleontology, Part G (1953)
- Zoaria mostly massive, lamellate, or stemlike, comprising typical so-called stony bryozoans. Zooecia consist of long calcareous tubes, generally intersected by many partitions (diaphragms), each tube being divisible into an immature region in the axial part of the zoarium characterized by thin walls, wide spacing of diaphragms, and contact with other zooecia on all sides, and a mature region near the zoarial surface characterized by thickened walls, close spacing of diaphragms, and intervention of special cells (mesopores, acanthopores) between zooecia. Monticules or maculae, comprising regularly spaced clusters of cells smaller or larger than average, commonly well defined on zoarial surface.