Fistulipora sana Trizna, 1958

Ernst, Andrej, Wyse Jackson, Patrick N. & Aretz, Markus, 2015, Bryozoan fauna from the Mississippian (Visean) of Roque Redonde (Montagne Noire, southern France), Geodiversitas 37 (2), pp. 151-213 : 160

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 ).

Figures

FIG. 8. — A-C, Fistulipora parvilabrum Schulga-Nesterenko, 1955; A, longitudinal section, SMF 21.770; B, tangential section, SMF 21.771; C, tangential section showing autozooecial aperture with lunarium, SMF 21.771. D, F, Fistulipora sana Trizna, 1958; D, longitudinal section, SMF 21.775; E, tangential section, SMF 21.774; F, tangential section showing autozooecial aperture with lunarium, SMF 21.774. G, Dybowskiella rotunda n. sp., holotype SMF 21.777. Scale bars: A, E, 1 mm; B, D, 0.5 mm, C, F, G, 0.2 mm.

FIG. 1. — A, Localisation of the Roque Redonde outcrop on a geological map showing the numerous limestone olistoliths (black) incorporated in the siliciclastic flysch deposits of the Laurens Flysch Group (grey) in the vicinity of Vailhan (modified from Engel et al. 1981); B, view on the Roque de Redonde from the NW. Abbreviation: RR, Roque Redonde.