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GEOREF RECORD

Early orthid brachiopods from the Tremadocian (Lower Ordovician) of northwestern Argentina

Enrique Villas, Zarela A. Herrera and Gladys C. Ortega
Early orthid brachiopods from the Tremadocian (Lower Ordovician) of northwestern Argentina
Journal of Paleontology (July 2009) 83 (4): 604-613

Abstract

Two brachiopod species of two of the earliest rhynchonelliformean families are described from one of the first studied Ordovician fossiliferous localities of northwestern Argentina. One is a new species of the family Euorthisinidae (Orthida, Plectorthoidea), Notorthisina musculosa Villas and Herrera. It displays peculiar features not observed in the family before, as well as a combination of internal and external features previously considered diagnostic of different genera, leading to emendment of the familial and generic diagnoses. Its dorsal muscle field, best impressed in large specimens, resembles that of Kvania Havlicek (Nanorthidae) in having four scars arranged radially. This feature reinforces the phylogenetic proximity of Kvania to the euorthisinids. The second studied species, Nanorthis bifurcata Harrington, has not been revised since its superficial description in 1937-1938, its type having been lost. Its description herein, based on a new collection from its type locality, allows a better knowledge of the group and helps clarify its supra-familial assignment.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 83
Serial Issue: 4
Title: Early orthid brachiopods from the Tremadocian (Lower Ordovician) of northwestern Argentina
Affiliation: Universidad de Zaragoza, Ciencias de la Tierra, Saragossa, Spain
Pages: 604-613
Published: 200907
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 30
Accession Number: 2009-068423
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: IGCP Project No. 503
Illustration Description: illus. incl. strat. col.
S24°33'00" - S24°33'00", W65°43'60" - W65°43'60"
Secondary Affiliation: Universidad Nacional de Cordoba, ARG, Argentina
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200937
Program Name: IGCPInternational Geological Correlation Programme
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