Middle Ordovician linguliformean microbrachiopods from western Argentina: new data and biogeographic implications

New linguliform microbrachiopods from the Middle Ordovician are described and illustrated. This fauna was recovered from the uppermost beds of the San Juan Formation in two sections of the Central Precordillera (Argentina), which are accurately dated to the Lenodus pseudoplanus Zone (middle Darriwil...

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Bibliographic Details
Published in:Journal of paleontology 2021-07, Vol.95 (4), p.720-732
Main Authors: Lavié, Fernando J., Mestre, Ana I., Carrera, Marcelo G.
Format: Article
Language:English
Subjects:
Argentina
Biogeography
Brachiopoda
Conotreta andina
Eoconulus tucunucoensis
Fauna
Fossils
IGCP
invertebrate
Lingulida
Linguliformea
lithostratigraphy
Luthieria diminuta
Marine invertebrates
Middle Ordovician
morphology
new taxa
Numericoma rowelli
Ordovician
Paleontology
Paleozoic
Precordillera
REGULAR ARTICLES
San Juan Argentina
San Juan Formation
Scaphelasma zharykensis
shells
South America
Stratigraphy
taxonomy
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Summary:New linguliform microbrachiopods from the Middle Ordovician are described and illustrated. This fauna was recovered from the uppermost beds of the San Juan Formation in two sections of the Central Precordillera (Argentina), which are accurately dated to the Lenodus pseudoplanus Zone (middle Darriwilian). The fauna consists of the obolid Luthieria diminuta n. gen. n. sp., and the acrotretids Eoconulus tucunucoensis n. sp., Conotreta andina Lavié, Serra, and Feltes, Scaphelasma zharykensis Popov, and Numericoma rowelli Holmer et al. This low-diversity lingulate association displays close similarities with coeval faunas that inhabited the Laurentia, Baltica, and Kazakhstanian regions, in agreement with evidence from other linguliform and rhynchonelliform brachiopods.
ISSN:0022-3360
1937-2337
DOI:10.1017/jpa.2021.19