Devonian bryozoans from Argentina: new cosmopolitan components of Southwestern Gondwanan basins

Lower to probably Middle Devonian bryozoans from western Argentina are reported. Five genera of trepostomes: Leptotrypa, Leptotrypella, Eridotrypella, Cyphotrypa, Boardmanella, and the cryptostome ?Pseudonematopora are described and figured. The paleobiogeographical significance of these bryozoans w...

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Bibliographic Details
Published in:Journal of paleontology 2019-03, Vol.93 (2), p.232-243
Main Authors: Carrera, Marcelo G, Ernst, Andrej, Rustán, Juan José
Format: Article
Language:English
Subjects:
Age
Argentina
Basins
biogeography
Boardmanella
Bryozoa
Carbonates
cosmopolitan taxa
Cyphotrypa
Devonian
Eridotrypella granosa
Fossils
Gondwana
invertebrate
Jachal Argentina
Leptotrypa
Leptotrypella
lithostratigraphy
morphology
Ocean basins
Paleolatitude
Paleontology
Paleozoic
Precordillera
Pseudonematopora
San Juan Argentina
South America
statistical analysis
taxonomy
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Summary:Lower to probably Middle Devonian bryozoans from western Argentina are reported. Five genera of trepostomes: Leptotrypa, Leptotrypella, Eridotrypella, Cyphotrypa, Boardmanella, and the cryptostome ?Pseudonematopora are described and figured. The paleobiogeographical significance of these bryozoans was analyzed in the context of Southern Gondwana during the Devonian. The group was considered as nearly absent from southwestern marine basins. In contrast with highly endemic groups, supporting the recognition of the Malvinokaffric Realm in this region, bryozoans reported are nearly cosmopolitan. The presence of those genera typical of warm-temperate, carbonate settings from low paleolatitudes, such as the Laurentian-European Eridotrypella, Leptotrypa, and Leptotrypella, or the Eurasians Boardmanella and ?Pseudonematopora, implies that these taxa were euritopic with remarkable capabilities for dispersion to reach high-latitude siliciclastic environments of the Southwestern Gondwanan basins.
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2018.81