Polypora sinokoninckiana Yang & Lu, 1962

Ernst, Andrej, Senowbari-Daryan, Baba & Hamedani, Ali, 2006, Middle Permian Bryozoa from the Lakaftari area, northeast of Esfahan (central Iran), Geodiversitas 28 (4), pp. 543-590 : 570-572

Polypora sinokoninckiana Yang & Lu, 1962 ( Figs 10P ; 11 A-D; Table 27)

Polypora sinokoninckiana Yang & Lu, 1962: 93 , pl. 17, figs 10-12.

MATERIAL EXAMINED. — 1-3-4, 9-5-4, 9-5-8, 9-7.

OCCURRENCE. — Southern China; Maokao Formation, Permian (?Murgabian) ( Yang & Lu 1980). Lakaftari: central Iran, Jamal Formation, Middle Permian.

DESCRIPTION

Micrometric formula: 8-11.5/5-7//16-22. Reticulated colonies with straight branches, joined by relatively thin dissepiments. Autozooecia arranged in 3-4 alternating rows on branches. Apertures circular, spaced 5-6 per length of a fenestrule; 1-2 small nodes developed in peristome. Shape of fenestrules varying from narrow oval to rectangular and triangular. Keels absent. Nodes small, rounded, hyaline, arranged in regular rows between apertures on the obverse colony surface, widely spaced. 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. Ovicells occurring occasionally, shaped as spherical chambers attached at distal part of apertures, reaching 0.14 mm in diameter.

INTERIOR DESCRIPTION

Autozooecia rhombic to hexagonal in the middle tangential section; relatively short in longitudinal section, with well developed vestibule; aperture positioned at distal to distal-abaxial end of chamber. Hemisepta absent. Terminal diaphragms occurring.

COMPARISON

Polypora sinokoninckiana is similar to P. timorensis Bassler, 1929 from the Permian of Indonesia. The latter species differs in having longer fenestrules (c. 2 vs. 0.99-1.47 mm in present material), and thinner branches (c. 0.45 vs. 0.60 mm in present material).

Figures

FIG. 10. — A-F, Polypora darashamensis Nikiforova,1933; A, 21-2, tangential section showing aperture with apertural nodes; B, 21-2, tangential section showing aperture with apertural nodes and high peristome;C, 21-2,tangential section showing aperture with apertural nodes and nodes on the colony surface; D, 21-2, deep tangential section; E, 21-2, tangential section showing apertures and nodes on the colony surface; F, 21-2, deep tangential section showing autozooecial chambers;G-J, Polypora magnicava Morozova, 1970; G, I, 19-1, tangential section; H, 19-1, tangential section showing aperture with apertural nodes and nodes on the colony surface; J, 19-1, cross section of the branch; K-O, Polypora aff.anshunensis Yang & Lu, 1980;K, 25-3-1,tangential section;L, M, 25-3-1, cross section; N, 25-3-1, tangential section showing apertures with apertural nodes; O, 25-3-1, deep tangential section;P, Polypora sinokoninckiana Yang & Lu, 1962, 1-3-4, tangential section. Scale bars: A-C, H, N, 0.1 mm; D, G, K, M, P, 1 mm; E, F, I, J, L, O, 0.5 mm.

FIG. 11. — A-D, Polypora sinokoninckiana Yang & Lu, 1962; A, 1-3-4, tangential section, showing apertures with nodes and nodes on colony surface; B, 9-5-4, tangential section of the branch; C, 9-5-4, deep tangential section of the branch; D, 9-5-4, cross section of the branch; E-G, Polypora principalis Gorjunova, 1975; E, 4-3, tangential section; F, 4-3, deep tangential section of the branch; G, 4-3, tangential section showing autozooecial apertures; H, I, Polyporella sp., 4-12, tangential section; J, K, Q, Fenestrida indet.; J, Q, 10-1-2, tangential section; K, 10-1-2, deep tangential section; L-P, Lakkela jamalica n. gen., n. sp.; L, SMF 2115, holotype, tangential section;M, SMF 2115,holotype,tangential section showing apertures and acanthostyles;N, 1-8-2, paratype,deep tangential section; O, 9-5-9, tangential section showing apertures and heterozooecia; P, SMF 2115, holotype, longitudinal section. Scale bars: A, G, M, O, 0.2 mm; B, C, F, I, L, 0.5 mm; D, J, K, N, P, 0.25 mm; E, H, 2 mm; Q, 1 mm.