Fenestrida, Astrova & Morozova, 1956

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 : 574-575

Fenestrida indet. ( Fig. 11J, K, Q )

MATERIAL EXAMINED. — Single fragment 10-1-2.

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

DESCRIPTION

Straight main branch with a single secondary branch diverging at angle of about 90°. Branches 0.28- 0.30 mm wide. Apertures circular, arranged in two rows on branches, non-alternating, 0.084 mm in diameter; spaced 15-16 on 5 mm distance along the branches. Keel low, straight. Nodes not observed. Reverse side of the colony smooth. Small microstylets in the outer laminated skeleton.

INTERIOR DESCRIPTION

Autozooecia elongated rectangular to oval in the middle tangential section. Long superior hemiseptum projecting deeply into the zooecial chamber, separating the distal third of it; inferior hemiseptum absent.

COMPARISON

In the colony shape this bryozoan resembles the genus Diploporaria Nickles & Bassler, 1900 . This genus includes about a dozen of species reported from Lower Carboniferous to Lower Permian. They reveal different internal morphology displaying the same colony shape, and may belong to different genera. An arrangement of apertures in non-alternating rows observable in present specimen is very unusual for fenestrate bryozoans at all.

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.