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 Megacanthopora Moore, 1929 Neorhombopora Shishova, 1964: 55 . TYPE SPECIES . — Megacanthopora fallacis Moore, 1929 by monotypy. Graham Formation (Pennsylvanian) ; Texas , USA . DIAGNOSIS. — Branched colonies with wide exozone (one-third to two-third of the branch radius). Autozooecia with oval apertures and irregularly thickened walls in the exozone, diverging at angles of 45° from the axis, intersecting the colony surface at angles of 80- 90°. Longitudinal arrangement of autozooecia irregular. Diaphragms complete, rare, occurring only in the exozone. Metazooecia rare to common. Acanthostyles uncommon. Aktinotostyles abundant, generally closely spaced, arising in the exozone. Autozooecial walls laminated, containing mural spines. FIG. 19. — A -F , Rhabdomeson progracile Wyse Jackson & Bancroft, 1995 ; A , longitudinal section showing axial cylinder, SMF 21.882; B , longitudinal section showing autozooecial chambers with hemisepta ( arrow ), SMF 21.882; C , tangential section showing autozooecial apertures, acanthostyles and paurostyles ( arrow ), SMF 21.872; D , tangential section showing acanthostyles and paurostyles ( arrow ), SMF 21.872; E , F , branch transverse section, SMF 21.875; G -I , Saffordotaxis incrassata ( Ulrich, 1888 ) , SMF 21.889; G , tangential section showing autozooecial apertures and aktinotostyles; H , I , branch longitudinal section. Scale bars: A, 2 mm; B, C, E, H, 1 mm; D, 0.2 mm; F, G, I, 0.5 mm. OCCURRENCE. —Lower Carboniferous – Upper Permian; worldwide. COMPARISON Megacanthopora Moore, 1929 differs from Rhombopora Meek, 1872 in having abundant metazooecia. REMARKS Astrova (1978) , Dunaeva (1973) , and Gorjunova (1985 , 1996 ) assigned this genus to the Stenoporidae (Trepostomida) . Blake (1983: 579-580) placed it in the Rhomboporidae ( Rhabdomesina , Cryptostomata ), and put the genus Neorhombopora Shishova, 1964 to the genus Megacanthopora Moore, 1929 , because the type species Rhombopora crassa Ulrich, 1884 possesses acanthostyles.