Dybowskiella, Waagen and Wentzel, 1886

Ernst, Andrej, 2016, Bryozoan fauna from the Permian (Artinskian-Kungurian) Zhongba Formation of southwestern Tibet, Palaeontologia Electronica (1946) 51 (9), pp. 1-59 : 7

Genus DYBOWSKIELLA Waagen and Wentzel, 1886

Type species. Dybowskiella grandis Waagen and Wentzel, 1886 . Permian; India.

Diagnosis. Ramose, hollow ramose, massive, or encrusting colonies. Autozooecia cylindrical, subcircular in transverse section of endozone, having rounded apertures, isolated by abundant polygonal vesicles. Basal diaphragms thin, straight or curved. Lunaria horseshoe-shaped, present in endozone and exozone; ends of lunaria inflect into autozooecial chamber. Autozooecial walls with granular boundary and light-coloured granular-prismatic cortex. Vesicular skeleton in endozone and exozone. Vesicles subrectangular with flat to slightly curved roofs. Small acanthostyles or tubuli in exterior stereom present. Monticules elevated or flash, with central cluster of vesicles surrounded by larger autozooecia in radial arrangement.

Remarks. Dybowskiella Waagen and Wentzel, 1886 differs from Fistulipora M‘Coy, 1849 in the shape of lunaria, the ends of which inflect autozooecial chambers in Dybowskiella . Dybowskiella differs from Eridopora Ulrich, 1882 in having horseshoe-shaped lunaria instead of triangular ones. The shape of lunaria with inflecting ends is the only significant character for discrimination of Dybowskiella . However, the inflection grade of ends of lunaria varies strongly in the species of Fistulipora , Dybowskiella and Fistuliramus . Therefore, the discrimination of the genus Dybowskiella is relatively uncertain.

Occurrence. Middle Devonian–Upper Permian; worldwide.