Clausotrypa ramosa ( Owen, 1973 )

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 : 176

Clausotrypa ramosa ( Owen, 1973)

( Fig. 18 D-I; Appendix)

Sulcoretepora ? ramosa Owen, 1973: 304 , pl. 9A-C.

Clausotrypa ramosa – Wyse Jackson 1996: 137, figs 37-41. — Ernst 2005: 59, fig. 4I, J.

MATERIAL. — SMF 21.860- SMF 21.871,TCD.60339, 60343, 60344.

OCCURRENCE. — Carboniferous, Mississippian (Visean); Ireland, Roque Redonde (Montagne Noire, southern France).

DESCRIPTION

Cylindrical branches, 1.01-1.64 mm in diameter, with 0.44- 0.80 mm wide endozone and 0.30-0.60 mm wide exozones. Autozooecia long, cylindrical, budding parallel to the branch axis for a long distance, gently curved toward to the colony surface. Autozooecial apertures oval. Thin, planar diaphragms rare in autozooecia. Tectitozooecia abundant, separating autozooecia in 1-3 rows, restricted to exozone, covered by thick calcitic skeleton on the colony surface. Acanthostyles large, having distinct hyaline cores, 4-9 surrounding each aperture and arranged irregularly in spaces between autozooecia. Autozooecial walls laminated, having dark serrated boundaries, 0.020 -0.025 mm thick.

COMPARISON

Clausotrypa ramosa ( Owen, 1973) is similar to C. monticula ( Eichwald, 1860) but differs from it in smaller distances between aperture centres (averagely 0.76 mm vs 0.81 mm in C. monticola ).

Figures

FIG. 18. — A-C, Pseudonematopora planatus Wyse Jackson, 1996; A, tangential section, SMF 21.857; B, longitudinal section, SMF 21.857; C, Transverse section, SMF 21.856; D-I, Clausotrypa ramosa (Owen, 1973); D, E, branch surface, SMF 21.871; F, tangential section, SMF 21.869; G-H, longitudinal section, SMF 21.869; I, transverse section, SMF 21.862. Scale bars: A-C, E, F, 0.5 mm; D, H, I, 1 mm; G, 2 mm.