| mhorn | Дата: Monday, 25.06.2012, 21:15 | Сообщение # 1 |
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| Thuy, B. and Schulz, H. 201X. The oldest representative of a modern deep-sea ophiacanthid brittle-star clade from Jurassic shallow-water coral reef sediments. Acta Palaeontologica Polonica 5X (X): xxx-xxx. http://dx.doi.org/10.4202/app.2011.0192
pdf: http://www.app.pan.pl/archive/published/app57/app20110192_acc.pdf
Ophiurites crinitus is a fossil brittle-star species which passed largely unnoticed since its original description. In this paper, we redescribe the type material of O. crinitus with the aim to put it into the context of modern ophiuroid systematics, and propose the new genus name Ophiosternle to replace the invalid Ophiurites. The re-assessed species is shown to be a member of the extant deep-sea family Ophiacanthidae, articulated fossils of which are extremely rare. It presents greatest affinities with members of the OphioplinthacaOphiocamax-Ophiomitra clade, of which it most probably represents the oldest known fossil species. The depositional environment of the strata, which yielded the described specimens is interpreted as shallow, storm-influenced marine setting in the immediate vicinity of coral reefs. This contrasts with the distribution pattern of extant species of the Ophioplinthaca-Ophiocamax-Ophiomitra clade, which almost exclusively occur at depths exceeding the shelf break
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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