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 Dybowskiella piriforme n. sp. ( Figs 9 D-F; 10A-D; Appendix) ETYMOLOGY. — The species name refers to the pear-shaped apertures of this species. HOLOTYPE . — SMF 21.781 . PARATYPES . — SMF 21.782- SMF 21.793, TCD.60336. TYPE LOCALITY . — Roque Redonde (Montagne Noire, southern France ). TYPE HORIZON . — Carboniferous, Mississippian (upper Visean). DIAGNOSIS. — Colony in form of hemispheric or globular masses; apertures small, with well-developed long lunaria; lunaria with 3-5 styles; basal diaphragms absent; vesicles small to large, separating autozooecia in a single row, 5-9 surrounding each autozooecia aperture. DESCRIPTION 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. Encrusting colony forming usually hemispheric to globular masses, 0.9-1.5 mm thick. Autozooecia growing from thin epitheca, often for long distances parallel to substrate, bending in the early exozone to the colony surface. Basal diaphragms absent. Autozooecial apertures circular to oval. Lunaria large, long, thick, containing 3-5 styles; lunarial styles 0.010 -0.015 mm in diameter; ends of lunaria indenting autozooecia. Vesicles small to large, separating autozooecia in a single row, 5-9 surrounding each autozooecia aperture, with rounded to flat roofs, polygonal in tangential section. Autozooecial walls granular prismatic, 0.005 -0.010 mm thick. COMPARISON Dybowskiella piriforme n. sp. differs from D. lebedevi Nikiforova, 1927 from the Lower Carboniferous of Ukraine in smaller autozooecial apertures ( 0.17-0.25 mm vs 0.30-0.35 mm in D. lebedevi ). Furthermore, Fistulipora elegans Schulga-Nesterenko, 1955 from the Moscovian of the Russian Platform is similar to the present species. However, F. elegans has larger und thicker lunaria.