Bryozoen der oberpermischen Zechstein-Formation von Deutschland

Abstract

The investigated bryozoan fauna of the Upper Permian Zechstein Formation includes 17 species of 9 genera, belonging mainly to the fenestellids and trepostomids and one species belonging to the tubuliporids, Corynotrypa voigtiana (KING 1850). Three new species ate described (Dyseritella microstoma sp. nov., Ulrichotrypella incrustata sp. nov., and Kingopora baderi sp. nov.). The Zechstein species of the genera Acanthocladia, Synocladia, Penniretepora and Kalvariella display close resemblance in their internal morphology, and their derivation from a common ancestor is suggested. The distribution of the bryozoans in the Zechstein Sea was apparently controlled by factors such as lateral sedimentation, distribution of microbial mats and quality of substrates.

Briozoarios del Orden Fenestrida, Pensilvánico de la Formación Ixtaltepec, Municipio de Nochixtlán, Oaxaca; consideraciones paleoambientales

“…Los briozoarios descritos como Penniretepora poseen autozoecios que pueden ser rectangulares, pentagonales o semi-hexagonales; en sección tangencial media pueden presentar o carecer de hemiseptos y estructuras superficiales como quillas y nodos. Estas características, basadas en la microestructura, indican la naturaleza polifilética del género (Ernst, 2001) y ello implica la necesidad de realizar una revisión profunda de la sistemática de este taxón. Debido a las condiciones de preservación del material de Santiago Ixtaltepec, no es posible observar con suficiente claridad la morfología de los zoecios, por lo que su asignación al género Penniretepora está basada fundamentalmente en los rasgos de morfología externa expuesta, entre ellos la presencia de frecuentes ramas secundarias, no conectadas entre sí y que no forman fenestras, así como dos hileras de autozoecios tanto en la rama principal como en las secundarias.…”

Bryozoans (trepostomes and fenestellids) in the Zechstein Limestone (Wuchiapingian) of the North-Sudetic Basin (SW Poland): palaeoecological implications

“…-Ca1, Up per Perm ian, Grodziec (lower and up per part of Ca1), Lwówek OEl¹ski syn clines (lower part of Ca1), Leszczyna Syncline (lower part of Ca1), North Sudetic Ba sin, SW Po land. This spe cies was orig i nally de scribed from the Ca1 of Ger many (Ernst, 2001a). Dyscritella microstoma has been re corded from the Zechstein Main Do lo mite (Ca2) in the NE part of Ger many (Rugen Is land) and the west ern and northern parts of Po land (Pogorzela 2 well, Fore-Sudetic Monocline; as well as Unis³aw IG 2 in Pomerania; Hara et al, 2009).…”

“…-Ca1, Up per Perm ian, Grodziec and Lwówek OEl¹ski syneclises, North Sudetic Ba sin, SW Po land; Thuringia (Ger many; Ernst, 2001a) and Lith u a nia (Morozova, 1970). Ernst, 2001 Figs.…”

“…Ernst, 2001 Figs. 3, 4G-I, 9B and Ta ble 3 2001 Dyscritella microstoma Ernst -Ernst (2001a) Description. -En crust ing col o nies 0.24 to 0.31 mm thick.…”

“…The great ma jor ity of the Zechstein spe cies come from Germany where 17 spe cies be long ing to nine gen era of trepostomes and fenestellids and one cyclostome were de scribed by Ernst (2001a). Nev er the less, Late Perm ian (Zechstein) fau nas ap pear to be not very rich com pared to the Early Perm ian counter parts de scribed from the Arc tic (Moro zova and Krutschinina, 1986;Nakrem, 1994), and the United States (Zimmerman and Cuffey, 1987), where more than 160 taxa have been re corded (Gilmour and Morozova, 1999).…”