Mackinneyella, Morozova and Lisitsyn, 1996

Ernst, Andrej, 2016, Bryozoan fauna from the Permian (Artinskian-Kungurian) Zhongba Formation of southwestern Tibet, Palaeontologia Electronica (1946) 51 (9), pp. 1-59 : 44

Genus MACKINNEYELLA Morozova and Lisitsyn, 1996

Type species. Polypora ornamentata Schulga-Nesterenko, 1941 . Lower Permian , southern Urals ( Russia) .

Diagnosis. Reticulated colonies of various shapes consisting of broad linear, essentially parallel branches joined by dissepiments; dissepiments narrow, perpendicular or at oblique angle to branches, regularly spaced at large distance; fenestrules elongate oval, sub-rectangular, or irregular in shape; keels and superstructure absent; autozooecia arranged in 5–6 rows on branches; chambers slightly elongate, proximally recumbent on budding plate, rhomboidal or rounded hexagonal in mid tangential section, long axis parallel with branch axis; hemisepta and diaphragms absent; granular skeleton present in basal plate and axial wall but locally absent in transverse and lateral autozooecial walls; extrazooecial skeleton laminated, traversed by abundant, moderate-size microstyles.

Remarks. Mackinneyella Morozova and Lisitsyn, 1996 differs from Polypora M’Coy, 1844 in having 5–6 autozooecial rows on branches instead of 3-4 and a rhombic vs. hexagonal autozooecia in mid-tangential section. Mackinneyella differs from Parapolypora Morozova and Lisitsyn, 1996 in having rhombic instead of hexagonal autozooecia.

Occurrence. Upper Devonian–Upper Permian; worldwide.