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Shell and associated operculum in Teiichispira (Macluritidae: Gastropoda) from the Early/Middle Ordovician of the Argentine Precordillera

Published online by Cambridge University Press:  15 May 2023

Verónica Bertero ,
Mariel Ferrari Open the ORCID record for Mariel Ferrari [Opens in a new window]  and
Marcelo G. Carrera Open the ORCID record for Marcelo G. Carrera [Opens in a new window]
Verónica Bertero
Affiliation:
Colegio Superior Universitario Manuel Belgrano, Universidad Nacional de Córdoba, La Rioja 1450, X5000EWD, Córdoba, Argentina.
Mariel Ferrari*
Affiliation:
*Instituto Patagónico de Geología y Paleontología, IPGP (CCT CONICET-CENPAT), Boulevard Alte. Brown 2915, (9120) Puerto Madryn, Provincia de Chubut, Argentina.
Marcelo G. Carrera
Affiliation:
CICTERRA (CONICET-Universidad Nacional de Córdoba), Facultad de Ciencias Exactas, Físicas y Naturales, Av. Vélez Sarsfield 1699, X5016GCA, Córdoba, Argentina.
*
*Corresponding author.
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Abstract

Two species of Teiichispira Yochelson and Jones reported from the Early/Middle Ordovician marine deposits of the San Juan Formation in the Argentine Precordillera are described. The new species Teiichispira teresae n. sp. is a component of the Early/Middle Ordovician marine gastropod assemblage in the studied region; Teiichispira argentina (Kayser), previously known from the San Juan Formation, is described with a complete teleoconch and associated operculum. The opercula of both Teiichispira species are complete and preserved in life position associated with the shell of T. argentina. The unguiculate morphology of the operculum is here interpreted as a mechanism for increasing the shell weight and ensuring anchoring to the substrate in a more or less fixed mode of life for Teiichispira, and as protection. The new occurrence of Teiichispira provides new taxonomic data on early Paleozoic marine gastropods in Argentina and testifies to a wide paleobiogeographical distribution for the genus, restricted to tropical and subtropical regions during the Early/Middle Ordovician.

UUID: http://zoobank.org/8ee48319-b17a-4d15-a7d4-99cc9bb1dc42

Type
Articles
Information
Journal of Paleontology , Volume 97 , Issue 3 , May 2023 , pp. 549 - 557
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Copyright
Copyright © CICTERRA-CONICET, IPGP-CONICET, and the Author(s), 2023. Published by Cambridge University Press on behalf of The Paleontological Society

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