Jordanopora Ross, 1963

Ernst, Andrej & Carrera, Marcelo G., 2022, A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera, Geodiversitas 44 (20), pp. 563-601 : 580

Genus Jordanopora Ross, 1963

TYPE SPECIES. — Jordanopora heroensis Ross, 1963 by original designation. Ordovician, Llanvirn-Llandeilo; United States.

DIAGNOSIS. — Colonies ramose or encrusting, with distinct exozones. Autozooecia prismatic, autozooecial apertures rounded-polygonal. Diaphragms generally lacking in endozones; thin, planar, closely to widely spaced or lacking in exozones. Autozooecial walls thin, laminated, irregularly undulating in endozones; thickly laminated, without cingulum, broadly and irregularly serrated in exozones. Tubules in exozonal walls abundant, thick, hyaline, generally oriented parallel to autozooecial growth. Mesozooecia rare to common, originating in endozone, containing thick diaphragms. Styles absent. Maculae low to flush, consisting of macrozooecia surround cluster of mesozooecia and massive extrazooidal skeleton near centres.

OCCURRENCE. — Chazy Series (Darriwilian-Sandbian) of New York, United States, and Sandbian of Argentina.

COMPARISON

Jordanopora Ross, 1963 differs from other genera of the Family Trematoporidae in absence of acanthostyles and presence of tubules in zooecial walls.