Fistuliporidae, Ulrich, 1882

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 : 549-550

Fistuliporidae (? Eridopora ) indet. ( Figs 2I, N ; 3 J-M; Table 5)

MATERIAL EXAMINED. — 4-8-11, 10-1-3, 19-4-2, 19- 4-10.

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

DESCRIPTION

Small encrusting colonies, up to 1.26 mm thick. Autozooecial cross section rounded on the colony surface, becoming irregularly polygonal in deeper tangential section. Apertures spaced 3-5 in 2 mm of the colony surface. Lunaria well developed, triangular, prominent, often overlapping neighbouring autozooecium, sharply terminating with single node. Autozooecial diaphragms absent. Hemiphragms rare to abundant, apparently spine-like, thick, occupying up to 1/3 of autozooecial chamber. Vesicles angular, large, having vaulted roofs, rare to abundant, sometimes separating autozooecia in two rows, spaced averagely 4 in 1 mm of autozooecial length. Walls apparently aragonitic initially; extant walls consisting of thick layers of needle-like crystals oriented perpendicularly to a dark medial line. Small nodes sporadically distributed on the colony surface; consisting of medial dark core and light crystals arranged radially.

COMPARISON

This bryozoan reveals only superficial resemblance to Eridopora , because of well developed triangular lunaria and vesicular skeleton (see the above described E. oculata ). The polygonal shape of the autozooecial cross section is very unusual, as well as wall structure, and especially the presence of hemiphragms. It is likely that this bryozoan belongs in a separate genus. However, the available material is not sufficient for a description of a new genus.

Order TREPOSTOMIDA Ulrich, 1882 Suborder AMPLEXOPORINA Astrova, 1965

Figures

FIG. 2. — A, B, D, E, G, Fistulipora monticulosa Nikiforova, 1933; A, 5, cylindrical colony; B, 5-9-3, tangential section; D, 5-11-1, thin section through cylindrical colony; E, 5-9-3, longitudinal section of encrusting colony;G, 5-11-1, tangential section;C, J, L, Fistulipora sp.; C, 4-16-5, longitudinal section of encrusting colony; J, 4-16-3, tangential section; L, 4-16-3, tangential section; F, H, K, M, Fistulipora timorensis Bassler, 1929; F, 10-2-2, longitudinal section; H, K, 25-10-3, tangential section; M, 7-3-2, deep tangential section of macula center; I, N, Fistuliporidae indet. (?Eridopora); I, 4-8-11, longitudinal section; N, 19-4-2, tangential section. Scale bars: A, 10 mm; B, E, 1 mm; C, G-I, K-N, 0.5 mm; D, 3 mm; F, 0.05 mm; J, 0.2 mm.

FIG. 3. — A-D, Ogbinopora orientalis Gorjunova, 1975; A, B, 5-6-3, longitudinal section (arrow in B: hemisepta); C, 5-9-3, cross section; D, 5-6, tangential section; E-I, Ascopora gracilis n. sp.; E, paratype 23-6-7, longitudinal section; F, 23-6-5, tangential section; G, 23-6-8, cross section; H, 23-6-7, longitudinal section; I, holotype SMF 2112, oblique tangential section (arrow: acanthostyle); J- M, Fistuliporidae indet. (?Eridopora); J, 4-8-11, tangential section; K, 19-4-10, longitudinal section showing hemisepta; L, 19-4-10, longitudinal section showing wall structure; M, 19-4-10, tangential section showing lunarium; N-P, Eridopora oculata Bassler, 1929; N, 11-1, tangential section; O, 16-1-7, tangential section showing hexagons around apertures; P, 16-1-7, longitudinal section. Scale bars: A, 1 mm; B, D, G, H, J, N-P, 0.5 mm; C, 2 mm; E, K, M, 0.1 mm; F, I, 0.25 mm; L, 0.05 mm.