. Bulletin of the Natural Histort Museum. Geology series. 154 WYSE JACKSON Distribution. Only recorded from County Fermanagh, York- shire, and the Midland Valley of Genus STENOPHRAGMIDIUM Bassler, 1952 I Type species. Stenophnigma lohatum Munro, 1912, by original | designation from the Lower Carboniferous of Ravenstonedale, Cum-, bria (formerly Westmoreland), England. j Revised diagnosis. Stenoporid with encrusting, rarely ramose) zoaria. Encrusting zoaria commonly form flat adnate colonies or hollow erect dichotomising expansions on which monticules arel, regularly developed.
. Bulletin of the Natural Histort Museum. Geology series. 154 WYSE JACKSON Distribution. Only recorded from County Fermanagh, York- shire, and the Midland Valley of Genus STENOPHRAGMIDIUM Bassler, 1952 I Type species. Stenophnigma lohatum Munro, 1912, by original | designation from the Lower Carboniferous of Ravenstonedale, Cum-, bria (formerly Westmoreland), England. j Revised diagnosis. Stenoporid with encrusting, rarely ramose) zoaria. Encrusting zoaria commonly form flat adnate colonies or hollow erect dichotomising expansions on which monticules arel, regularly developed. Autozooecial chambers have thickened walls in the exozone, where they are of uniform width or occasionally moniliform. i; Autozooecial chambers diverge distally at a low angle in the thin I endozone, becoming perpendicular to the zoarial surface in the wider exozone. Up to five hemiphragms are developed on proximal walls, at the top of the endozone and in the exozone, where they extend halfway across chambers Autozooecial apertures are of moderate size, circular to oval in shape, and closely spaced. Exilazooecia are rare. Large acanthostyles may be situated at zooecial wall junctions, and heterostyles may be disposed between them. Discussion. This genus, which is restricted to the Carboniferous, was first described from Northern England (Munro 1912). To date nineteen species have been reported; four species have been de- scribed from the Carboniferous of the British Isles. The British species are Stenophragiuidium grandyense (Munro 1912), 5. lobatum^ (Munro 1912) [the type species], S. incrustans Owen 1973 and S. mmosiim Owen 1969. To these, five Tabulipora species of Lee (1912) may be added, as well as Tabulipora serrata Smyth, 1922 (from the Lower Carboniferous (Brigantian) of Ballycastle. County Antrim). They possess "tabulae' which 'extend only partly, leaving^ an untabulated space, ... always situated on the distal side ..." (Lee^ 1912: 171). The 'tabulae' are cl
Size: 1103px × 2266px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bhlconsortium, bookc, bookcentury1900, bookcollectionbiodiversity
