Upper Jurassic Rhynchonellid Brachiodops from northwestern Europe

Abstract

Somalvhynchia, Septaliphoria, and Torquirhynchia gen. nov. are described. By using serial sectioning and acetate peel techniques, the internal structures of all but the rarest species have been investigated and the majority of these are described and figured for the first time. New taxa include six species, a subgenus, and a genus.Observations on ecology and distribution are given with the specific descriptions and separate sections are also included dealing with these aspects at generic level. as seen in transverse section would seem to be the way in which, from being initially flattened in the plane of articulation, by the development of vertical elements at their inner ends, they again become flattened but lying at right angles to the plane of articulation and slightly to the ventral side of it.Species. The following nominal species are attributed to the genus M. czenstochaviensis (Roemer) (1870, p. 247, pl. xxii, figs. 12-14) M. lineolata (Phillips) (as figured by Jacob and Fallot 1913, pp. 17-18, pl. i, figs. Q-14).

Linking Western Tethyan Rhynchonellide morphogroups to the key post-Palaeozoic extinction and turnover events

“…Thus, several dimerelloids such as Peregrinella, Sulcirostra, and Rhynchonellina have been related with cold seeps or chemosynthesis-based ecosystems (Campbell and Bottjer 1995;Sandy 1995Sandy , 2010Dulai 2002;Peckmann et al 2007Peckmann et al , 2013Kiel et al 2014;Sandy and Peckmann 2016;Palfy et al 2017, among J o u r n a l P r e -p r o o f Journal Pre-proof others); in the same way, the raducal spinose Acanthothyrids, have been often related with pararecifal environments (e.g. Childs 1969) and Cryptopora could be adapted to deeper (up to abyssal) environments (Surlyk and Johansen 1984). The role of the leptinoid raducal smooth or paucicostate morphogroup is more difficult to analyse because of their scarcity, but it is noticeable its record just prior to the first occurrence of the leptinoid raducal ribbed forms in epicontinental areas, both in the Triassic and in the Paleogene.…”