Sofia Pereira, Miguel Pires, Armando Marques Guedes, et al., (2017), The illaenid trilobites Vysocania (Vanìk & Vokáè, 1997) and Octillaenus (Barrande, 1846) from the Upper Ordovician of the Czech Republic, Portugal, Spain and Morocco, Bulletin of Geosciences 92(4), Czech Geological Survey, Prague. (original) (raw)
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Bulletin of Geosciences, 2017
The illaenid trilobite Vysocania is widely represented in the Upper Ordovician of the Czech Republic, Portugal and Spain, and is one of the most characteristic taxa in the high-latitude peri-Gondwana palaeobiogeographical region to which it is endemic. Three species of the genus that were formerly assigned to Stenopareia and Zetillaenus, from the Czech Republic and Spain respectively, are herein revised, and a new species is described from the Czech Republic. The genus Octillaenus, of which a new species is described from the Upper Ordovician of Morocco, is considered to have arisen from Vysocania through paedomorphic (neotenic) processes. The relationships between Vysocania, Octillaenus, Stenopareia and Zetillaenus are reviewed and the criteria used in the definition of these taxa discussed. Species assigned to Vysocania are V. vaneki (type-species), V. iberica, V. moraveci sp. nov. and V. panderi; species assigned to Octillaenus are O. hisingeri (type-species) and O. marocanus sp. nov. Vysocania appears for the first time in the lower Berounian (Sandbian) and has its last undoubted record in the upper Berounian (upper Katian); Octillaenus is presently restricted to the Kralodvorian (upper Katian).
The illaenid trilobites Vysocania (Vaněk & Vokáč, 1997) and Octillaenus (barrande, 1846) from the Upper Ordovician of the Czech Republic, Portugal, Spain and Morocco, 2017
The illaenid trilobite Vysocania is widely represented in the Upper Ordovician of the Czech Republic, Portugal and Spain, and is one of the most characteristic taxa in the high-latitude peri-Gondwana palaeobiogeographical region to which it is endemic. Three species of the genus that were formerly assigned to Stenopareia and Zetillaenus, from the Czech Republic and Spain respectively, are herein revised, and a new species is described from the Czech Republic. The genus Octillaenus, of which a new species is described from the Upper Ordovician of Morocco, is considered to have arisen from Vysocania through paedomorphic (neotenic) processes. The relationships between Vysocania, Octillaenus, Stenopareia and Zetillaenus are reviewed and the criteria used in the definition of these taxa discussed. Species assigned to Vysocania are V. vaneki (type-species), V. iberica, V. moraveci sp. nov. and V. panderi; species assigned to Octillaenus are O. hisingeri (type-species) and O. marocanus sp. nov. Vysocania appears for the first time in the lower Berounian (Sandbian) and has its last undoubted record in the upper Berounian (upper Katian); Octillaenus is presently restricted to the Kralodvorian (upper Katian). • Key words: Stenopareia, Zetillaenus, Illaenidae, high-latitude peri-Gondwana, Dalmanitoidean Realm.
Bulletin of Geosciences
Revision of the Middle Ordovician (Darriwilian) illaenimorph trilobite Svobodapeltis avus (Holub, 1908) results in a substantially emended diagnosis of the genus Svobodapeltis Šnajdr, 1957 and its assignment to the Family Hemibarrandiidae Courtessole & Pillet, 1975. The general illaeniform morphology of Svobodapeltis and its relative Hemibarrandia Prantl & Přibyl, 1949, with effaced cephalon and pygidium, the connective suture on the cephalic doublure indicating the presence of a rostral plate, no articulating furrows in the axis, and the fulcrate thorax are in distinct contrast with the presence of pleural furrows on all thoracic segments. The glabella that is defined anteriorly, the presence of border furrows on the cephalon, lack of the lunette, and furrowed segments are regarded as convincing evidence for separation of the Hemibarrandiidae from other illaenoids. The illaenid Caudillaenus advena (Barrande, 1872), a specimen of which was previously assigned to S. avus that influenced the concept of the genus, is redescribed together with its ancestor C. aff. advena.
Carnets de géologie (Notebooks on geology), 2007
In the vicinity of Saint-Saturnin-lès-Apt (Vaucluse, SE France), which is included in the area of the historic Aptian stratotype of Apt-Gargas, are four sections in a succession that permits the study in a very detailed and continuous way of the last beds of the upper Bedoulian and those of the lower Gargasian. The Ostracod content of the microfauna is relatively important and in a satisfactory state of preservation. 46 species have been indexed of which three are new: Cytherella circumrugosa nov. sp., Cytherelloidea bedouliana nov. sp. and Parexophthalmocythere (Parexophthalmocythere) sp. Until the present day, our comprehension of this group of microfossils in this stratigraphic interval was very fragmentary, not just in the Apt region but also in the Bedoulian historic stratotype area (Cassis-la Bédoule). This new study made it possible to determine a good number of species not previously reported in the stratotypes, to refine the generic status of many forms and to place some of them in open nomenclature. The completion of a chronologic distribution chart collated with a recently published foraminiferal zonation (Cabri, Luterbacheri and Ferreolensis zones) shows very clearly the bipartite distribution of a good part of the Ostracod fauna. Accordingly, two ensembles are recognized, one at the end of the upper Bedoulian (index species Protocythere bedoulensis), the other characterizing the lower Gargasian, identified by the appearance and development of Parataxodonta inornata. The two groups are sharply separated by an episode of impoverished microfaunas at the base of the Gargasian.
Odontopleurid trilobites of the Katian/Hirnantian boundary interval in the Prague Basin (Bohemia)
Bulletin of Geosciences, 2014
A new association of odontopleurid trilobites is described from calcareous claystone to marlstone, the so-called "Perník Bed", of the topmost part of the Králův Dvůr Formation. The association includes Diacanthaspis krizi sp. nov., associated with Bojokoralaspis peregrina (Barrande, 1872) and other rare and poorly known odontopleurids preliminary referred to