Bryozoan fauna from the Mississippian (Visean) of Roque Redonde (Montagne Noire, southern France) Author Ernst, Andrej Author Wyse Jackson, Patrick N. Author Aretz, Markus text Geodiversitas 2015 2015-06-30 37 2 151 213 http://dx.doi.org/10.5252/g2015n2a2 journal article 10.5252/g2015n2a2 1638-9395 4534998 urn:lsid:zoobank.org:pub:BA9B2FF0-9D3B-44AF-894F-419DE5AE4C13 Genus Dyscritella Girty, 1911 TYPE SPECIES . — Dyscritella robusta Girty, 1911 by original designation. Lower Carboniferous ; Arkansas , USA . OCCURRENCE. — Devonian to Triassic; worldwide. DIAGNOSIS. — Dendroid and encrusting colony with abundant acanthostyles and exilazooecia. Autozooecia parallel to longitudinal direction of the colony in endozone; gradually bending outward in exozone. Diaphragms in autozooecia lacking or very rare; lacking in exilazooecia. Exilazooecia circular to angular in cross section and separated from the autozooecia and from each other by thick walls. Two sizes of acanthostyles may be present. Zooecial walls thin in endozone, rapidly thickening in the exozone (modified after Ernst & Gorgij, 2013 ). FIG. 14. — A -E , Sulcoretepora parallela ( Phillips, 1836 ) ; A , deep tangential section, SMF 21.824. B , tangential section, SMF 21.824; C , tangential section, SMF 21.837; D , longitudinal section,SMF 21.827. E , branch transverse section, SMF 21.833; F -H , Ramiporalia robusta Delvolve & McKinney, 1983 , branch transverse section, SMF 21.843. Scale bars: A, B, D, G, 0.5 mm; C, E, H, 0.2 mm; F, 1 mm. FIG. 15. — A -D , Ramiporalia robusta Delvolve & McKinney,1983 ; A , general view of the colony; B , mid-tangential section of the colony,SMF 21.841; C , D , shallow tangential section of the colony, SMF 21.842. Scale bars: A, 30 mm; B, C, 10 mm; D, 0.5 mm. FIG. 16. — A -C , Ramiporalia robusta Delvolve & McKinney, 1983 ; A , shallow tangential section showing autozooecial aperture, SMF 21.839; B , C , branch midtangential section, SMF 21.841; D -H , Tabulipora howsii ( Nicholson, 1881 ) ; D , E , tangential section showing autozooecial apertures and acanthostyles ( arrow ), SMF 21.852; F , H , longitudinal section showing ring septa, SMF 21.851. Scale bars: A, H, 0.2 mm; B, C, F, G, 1 mm; D, E, 0.5 mm. COMPARISON Dyscritella Girty, 1911 generally lacks diaphragms which are commonly developed in the similar genus Dyscritellina Morozova in Dunaeva & Morozova, 1967 .