Fistulipora sana Trizna 1958

(Fig. 8 D-F; Appendix)

Fistulipora sana Trizna, 1958: 41-42, pl. 3, figs 5-6. — Lu, Xia & Li, 1978: 327, pl. 1, figs 17-18. — Gorjunova & Morozova, 1979: 31, pl. 1, Fig. 1.

MATERIAL. — SMF 21.773- SMF 21.776.

OCCURRENCE. — Carboniferous, Mississippian (upper Visean); Roque Redonde (Montagne Noire, southern France). Carboniferous, Mississippian (Visean); Russia (Siberia), Mongolia. Carboniferous, Mississippian (Visean), Coahai Formation; Weining, western Guizhou, China.

DESCRIPTION

Encrusting colony, 0.60-0.78 mm thick. Autozooecia growing from thin epitheca, bending in the early exozone to the colony surface. Basal diaphragms rare to absent, straight, thin.Autozooecial apertures circular to oval. Lunaria weakly developed, horseshoe-shaped; ends of lunaria not indenting autozooecia. Vesicles small, separating autozooecia in 1-2 rows, 8-13 surrounding each autozooecia aperture, with rounded roofs, polygonal in tangential section. Autozooecial walls granular prismatic, 0.005 -0.015 mm thick.

COMPARISON

Fistulipora sana Trizna, 1958 differs from F. parvilabrum Schulga-Nesterenko, 1955 in smaller distances between autozooecial apertures (averagely 0.40 mm vs 0.56 mm in F. parvilabrum), and smaller and more abundant vesicles. Fistulipora sana differs from F. taidonensis Trizna, 1958 from the Visean of Siberia in larger autozooecial apertures (aperture width 0.19-0.32 mm vs 0.18-0.20 mm in F. taidonensis).