The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications

Pholadomya gigantea is a widely distributed Early Cretaceous bivalve mollusc. It has been recorded in the North Temperate, Tethyan, and South Temperate Realms. Based on recent field work and newly collected material from the Neuquén Basin, the taxonomy, mode of occurrence and palaeobiogeography of t...

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Detalles Bibliográficos
Autor principal: Lazo, Dario Gustavo
Publicado: 2007
Materias:
Anomalodesmata
Argentina
Bivalvia
Cretaceous
Palaeoecology
Palaeogeography
Pholadomya
Taxonomy
bivalve
paleobiogeography
paleoecology
species occurrence
taphonomy
taxonomy
Neuquen Basin
South America
Candida
Mollusca
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05677920_v52_n2_p375_Lazo
http://hdl.handle.net/20.500.12110/paper_05677920_v52_n2_p375_Lazo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_05677920_v52_n2_p375_Lazo
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spelling paper:paper_05677920_v52_n2_p375_Lazo2023-06-08T15:42:38Z The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications Lazo, Dario Gustavo Anomalodesmata Argentina Bivalvia Cretaceous Palaeoecology Palaeogeography Pholadomya Taxonomy bivalve Cretaceous paleobiogeography paleoecology species occurrence taphonomy taxonomy Argentina Neuquen Basin South America Anomalodesmata Bivalvia Candida Mollusca Pholadomya gigantea is a widely distributed Early Cretaceous bivalve mollusc. It has been recorded in the North Temperate, Tethyan, and South Temperate Realms. Based on recent field work and newly collected material from the Neuquén Basin, the taxonomy, mode of occurrence and palaeobiogeography of this species is reviewed. In the Agrio Formation (Valanginian-Barremian) P. gigantea is neither abundant nor dominant, but occurs throughout the unit. It was facies-dependent being restricted to well-oxygenated waters and soft to firm, sandy and bioclastic substrates of shoreface to inner shelf environments. The life habit of P. gigantea was similar to that of Recent Pholadomya candida, deep burrowing and sedentary, but it has not a pedal gape and accessory muscle scars related to valve closure. Thus a suspension-feeding habit, not a pedal-feeding system, may be inferred as is commonly suggested in other Jurassic and Cretaceous Pholadomya species. Pholadomya agrioensis is a valid taxon that is recorded in the Berriasian-Valanginian of Neuquén. It is similar in outline to P. gigantea and had probably the same basic palaeoecology, even though it has a blunt anterior margin, deep umbonal-ventral sulcus and distinct anterior ornamentation. Once in life position this species was capable of further digging in the sediment. This species probably burrowed in muddy substrates in the offshore zone. Pholadomya sanctaecrucis from the Valanginian of Europe and also recorded in Argentina is ornamented only with commarginal lines and should be removed to the genus Homomya. Fil:Lazo, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05677920_v52_n2_p375_Lazo http://hdl.handle.net/20.500.12110/paper_05677920_v52_n2_p375_Lazo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anomalodesmata
Argentina
Bivalvia
Cretaceous
Palaeoecology
Palaeogeography
Pholadomya
Taxonomy
bivalve
Cretaceous
paleobiogeography
paleoecology
species occurrence
taphonomy
taxonomy
Argentina
Neuquen Basin
South America
Anomalodesmata
Bivalvia
Candida
Mollusca
spellingShingle Anomalodesmata
Argentina
Bivalvia
Cretaceous
Palaeoecology
Palaeogeography
Pholadomya
Taxonomy
bivalve
Cretaceous
paleobiogeography
paleoecology
species occurrence
taphonomy
taxonomy
Argentina
Neuquen Basin
South America
Anomalodesmata
Bivalvia
Candida
Mollusca
Lazo, Dario Gustavo
The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
topic_facet Anomalodesmata
Argentina
Bivalvia
Cretaceous
Palaeoecology
Palaeogeography
Pholadomya
Taxonomy
bivalve
Cretaceous
paleobiogeography
paleoecology
species occurrence
taphonomy
taxonomy
Argentina
Neuquen Basin
South America
Anomalodesmata
Bivalvia
Candida
Mollusca
description Pholadomya gigantea is a widely distributed Early Cretaceous bivalve mollusc. It has been recorded in the North Temperate, Tethyan, and South Temperate Realms. Based on recent field work and newly collected material from the Neuquén Basin, the taxonomy, mode of occurrence and palaeobiogeography of this species is reviewed. In the Agrio Formation (Valanginian-Barremian) P. gigantea is neither abundant nor dominant, but occurs throughout the unit. It was facies-dependent being restricted to well-oxygenated waters and soft to firm, sandy and bioclastic substrates of shoreface to inner shelf environments. The life habit of P. gigantea was similar to that of Recent Pholadomya candida, deep burrowing and sedentary, but it has not a pedal gape and accessory muscle scars related to valve closure. Thus a suspension-feeding habit, not a pedal-feeding system, may be inferred as is commonly suggested in other Jurassic and Cretaceous Pholadomya species. Pholadomya agrioensis is a valid taxon that is recorded in the Berriasian-Valanginian of Neuquén. It is similar in outline to P. gigantea and had probably the same basic palaeoecology, even though it has a blunt anterior margin, deep umbonal-ventral sulcus and distinct anterior ornamentation. Once in life position this species was capable of further digging in the sediment. This species probably burrowed in muddy substrates in the offshore zone. Pholadomya sanctaecrucis from the Valanginian of Europe and also recorded in Argentina is ornamented only with commarginal lines and should be removed to the genus Homomya.
author Lazo, Dario Gustavo
author_facet Lazo, Dario Gustavo
author_sort Lazo, Dario Gustavo
title The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
title_short The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
title_full The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
title_fullStr The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
title_full_unstemmed The bivalve Pholadomya gigantea in the Early Cretaceous of Argentina: Taxonomy, taphonomy and paleogeographic implications
title_sort bivalve pholadomya gigantea in the early cretaceous of argentina: taxonomy, taphonomy and paleogeographic implications
publishDate 2007
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05677920_v52_n2_p375_Lazo
http://hdl.handle.net/20.500.12110/paper_05677920_v52_n2_p375_Lazo
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