. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA 151 1988 TahuUpom urii (Fleming);Yang, Hu & Xia: 69, pi. 22, figs 5-8. Material. BM(NH) PD9472, 9638-9642, 9704; , 42593b, 42604b, Upper part of the Glencar Limestone (Visean, Asbian), Carrick Lough, County Fermanagh; BELUM K15200- 15208, Upper part of the Glencar Limestone (Visean, Asbian), Siilees River, County Fermanagh. Description. Zoaria are erect, ramose expansions of bifurcating cylindrical branches reaching in diameter. Autozooecial chambers are budded interzooecially from the bra
. Bulletin of the Natural Histort Museum. Geology series. LOWER CARBONIFEROUS BRYOZOA 151 1988 TahuUpom urii (Fleming);Yang, Hu & Xia: 69, pi. 22, figs 5-8. Material. BM(NH) PD9472, 9638-9642, 9704; , 42593b, 42604b, Upper part of the Glencar Limestone (Visean, Asbian), Carrick Lough, County Fermanagh; BELUM K15200- 15208, Upper part of the Glencar Limestone (Visean, Asbian), Siilees River, County Fermanagh. Description. Zoaria are erect, ramose expansions of bifurcating cylindrical branches reaching in diameter. Autozooecial chambers are budded interzooecially from the branch centres. Chambers diverge from the centre of branches at a low but constant angle of 30° in the endozone. They bend abruptly at the exozone; vestibules are orientated at angles of between 70° and 80° to the zoarial surface. Autozooecial chambers are ten to twelve times longer than wide. Chamber walls are very thin () in the endozone, but thicken considerably (to ) in the exozone, where in some specimens as many as five monilae may occur. They are pear to oval-shaped thickenings of the chamber wall, and may be separated by lengths of thin chamber wall. Skeletal laminae within the wall are deflected away from the zoarial surface from a central dark zone at autozooecial boundaries. In cross section and deep tangential section chambers are polygonal in shape. Ring septa are developed in autozooecial chambers towards the top of the endozone and throughout the exozone. A solitary or pair of thin, widely spaced endozonal ring .septa contrast with up to seven thicker and more closely spaced ring septae developed in the exozone. Foramen are circular or oval in shape and are placed either centrally or slightly laterally. The central walls of ring septa constitute a thickened ring that is bent posteriorly. Autozooecial apertures are large, circular to oval in shape, and closely spaced at less than one diameter apart. They are irregularly arranged over the zoarial surfac
Size: 1648px × 1515px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
