Middle Permian Bryozoa from the Lakaftari area, northeast of Esfahan (central Iran) Author Ernst, Andrej Institut für Geowissenschaften der Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Str. 10, D- 24118 Kiel (Germany) ae @ gpi. uni-kiel. de Author Senowbari-Daryan, Baba Institute of Paleontology, University of Erlangen-Nürnberg, Loewenichstr. 28, D- 91054 Erlangen (Germany) basendar @ pal. uni-erlangen. de Author Hamedani, Ali University of Esfahan, Faculty of Earth Sciences, Esfahan (Iran) hamedani _ ali @ hotmail. com ali@hotmail.com text Geodiversitas 2006 28 4 543 590 journal article 10.5281/zenodo.4665450 1638-9395 4665450 Polypora principalis Gorjunova, 1975 ( Fig. 11 E-G; Table 28 ) Polypora principalis Gorjunova, 1975: 97 , pl. 26, fig. 3. — Gorjunova & Morozova 1979: 87 , pl. 26, fig. 2. HOLOTYPE . — No. 2351/392, PIN ; Central Pamir ( Tajikistan ); Lower Permian. MATERIAL EXAMINED. — 4-3. OCCURRENCE. — Central Pamir ( Tajikistan ), Lower Permian ( Gorjunova 1975 ). Central Mongolia, Permian ( Gorjunova & Morozova 1979 ). Lakaftari: central Iran , Jamal Formation, Middle Permian. DESCRIPTION Micrometric formula: 6/4-5//15. Single fragment of reticulated colony with straight branches, joined by relatively thin dissepiments. Bifurcation common. Autozooecia arranged in 3-5 alternating rows on branches, becoming 7 at the site of bifurcation and 3 after the bifurcation. Apertures circular, spaced 6-7 per length of a fenestrule; rarely 1-2 small nodes developed in peristome. Shape of fenestrules varying from oval to rectangular. Keels absent. Nodes small, arranged in regular rows between apertures on the obverse colony surface, widely spaced, hyaline. Internal granular skeleton moderately thick, well developed, continuous with nodes, rods, peristome and across dissepiments. Outer lamellar skeleton moderately thick, containing abundant rods 5- 6 µm in diameter. INTERIOR DESCRIPTION Autozooecia rhombic to hexagonal in the middle tangential section, irregularly shaped in place of bifurcation; high and short in longitudinal section, with well developed vestibule; elongate to branch length; aperture positioned at distal to distal-abaxial end of chamber. Hemisepta absent. COMPARISON The investigated material shows close similarity to Polypora principalis from the Lower Permian of Central Pamir. Polypora nianekensis Morozova, 1981 from the Upper Permian of the Northeast of Russia is also similar. The latter species has thicker branches (1.00-1.20 vs. 0.75-0.90 mm in P. principalis ).