Polyporella, Simpson, 1895

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 : 572-574

Polyporella sp. ( Fig. 11H, I ; Table 29)

MATERIAL EXAMINED. — 4-12-2.

OCCURRENCE. — Lakaftari: central Iran, Jamal Formation, Middle Permian.

DESCRIPTION

Micrometric formula: 13-14/13//17. Single fragment of reticulated colony with straight branches, joined by thick dissepiments. Bifurcation common. Autozooecia arranged in 3 alternating rows on branches, becoming 4 in the place of bifurcation, and 2-3 after the bifurcation. Apertures circular, spaced 2-3 per length of a fenestrule; few small nodes developed in peristome. Fenestrules small, ovally shaped. Keels absent. Nodes small, rounded, irregularly spaced on the obverse colony surface. Internal granular skeleton thick, well developed, continuous with nodes, rods, peristome and across dissepiments. Outer lamellar skeleton moderately thick, containing abundant rods 5-10 µm in diameter.

INTERIOR DESCRIPTION

Autozooecia rhombic to hexagonal and pentagonal (half-hexagonal) in the middle tangential section; with well developed vestibule; elongate to branch length; aperture positioned at distal to distal-abaxial end of chamber. Hemisepta absent.

COMPARISON

This bryozoan shows some similarities to Polyporella visenda Gorjunova, 1975 from the Lower Permian of Central Pamir ( Tajikistan). However, the latter species possesses prominent keels with large nodes.

Figures

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.