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Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods

100%

Baeza-Carratala J. F., Garcia Joral F.

Acta Palaeontologica Polonica

2014

tom 59

nr 3

Analysis of the internal structure carried out on several representative genera of the brachiopod family Zeilleriidae from the Lower Jurassic of the Betic Ranges (SE Spain), complemented with specimens from nearby domains such as the Iberian Range and Lusitanian Basin, has enabled to propose a model for discrimination of genera based on the relative position of the crural bases with respect to the hinge plates. This particular feature has been analysed in the genera Zeilleria, Bakonyithyris, Securina, Neozeilleria, Cincta, Aulacothyris, and Plesiothyris, revealing three different basic patterns of crural bases arrangement: a Zeilleria-type, with crural bases distinctly arising from the ventral side of the hinge plates; a Securina-type, with crural bases originating transversally to the hinge plates and dorsally prominent; and a Bakonyithyris-type, intermediate between both previous patterns.

The oldest post-Paleozoic (Ladinian, Triassic) brachiopods from the Betic Range, SE Spain

80%

Baeza-Carratala J. F., Perez-Valera F., Perez-Valera J. A.

Acta Palaeontologica Polonica

2018

tom 63

nr 1

Triassic brachiopods from the Betic Range were unknown hitherto. Herein we describe the first brachiopod occurrences in the early Ladinian of this domain referable to a new genus and species Misunithyris goyi derived from three localities of the south-Iberian Triassic outcrops. The analysis of internal and external characters of this brachiopod allowed to characterize systematically and biogeographically this fauna in a chronostratigraphic interval when the paucity of brachiopod records is attributable to the entire peri-Iberian epicontinental platform system established in the westernmost Tethyan margin. The new record is endemic to the Betic Range and represents a new faunal constituent of the multicostate zeillerids stock. This fauna inhabited the epicontinental seas of the Sephardic bioprovince since a closer affinity with the low-latitude Tethyan assemblages is revealed. The possible linkage of the Triassic stock with the Early–Middle Jurassic multicostate zeillerid representatives suggests feasible phylogenetic relationships between both groups.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Baeza-Carratala J. F.

1 Garcia Joral F.

1 Perez-Valera F.

1 Perez-Valera J. A.

1 2018

1 2014

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Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods

The oldest post-Paleozoic (Ladinian, Triassic) brachiopods from the Betic Range, SE Spain