Dyscritella, Girty, 1911

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 : 174

Dyscritella sp.

( Fig. 17A )

MATERIAL. — TCD.60345, SMF 21.897.

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

DESCRIPTION

Small encrusting colony on unknown cylindrical substrate, 0.30-0.34 mm thick; autozooecial chambers simple, tubular, diverging from budding base at angle of between 45-80°, subparallel in endozone, with abrupt turn at endozone-exozone boundary. Zooecial walls tripartite in endozone, with a thin central dark zone surrounded by thin paler laminated skeleton. Walls thick, uniform width in exozone, with acanthostyles developed from base of exozone. Diaphragms or other intrachamber structures not developed. Exilazooecia present as small elongate u-shaped tubes, one or two in exozone between autozooecial apertures.

COMPARISON

On the basis of just one specimen preserved in longitudinal section only it is not possible to determine all of its specific characteristics and so it is left in open nomenclature.

Order CRYPTOSTOMATA Vine, 1884 Suborder RHABDOMESINA Astrova & Morozova, 1956 Family ARTHROSTYLIDAE Ulrich, 1882

Figures

FIG. 17. — A, Dyscritella sp., longitudinal section,TCD.60345;B-D, Nematopora hibernica Wyse Jackson,1996;B, obverse colony surface,TCD.60348;C, obverse colony surface, TCD.60349; D, reverse colony surface, TCD.60349. Scale bars: A, 0.5 mm; B-D, 1 mm.