Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina

Shell morphology affects multiple aspects of the biology of ectocochleate cephalopods (e.g., floatability, life habit, post mortem behavior of the shell, etc.), so it should impact the establishment and development of sclerobiont faunas as well. In this study, the sclerobiont faunas of Weavericeras...

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Autores principales: Luci, L., Cichowolski, M., Aguirre-Urreta, M.B.
Formato: JOUR
Materias:
biostratigraphy
burial diagenesis
fauna
Hauterivian
mollusc
morphology
preservation
shell
species richness
substrate
Argentina
Cephalopoda
Nautilida
Ostreidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08831351_v31_n2_p41_Luci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08831351_v31_n2_p41_Luci
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spelling todo:paper_08831351_v31_n2_p41_Luci2023-10-03T15:40:30Z Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina Luci, L. Cichowolski, M. Aguirre-Urreta, M.B. biostratigraphy burial diagenesis fauna Hauterivian mollusc morphology preservation shell species richness substrate Argentina Cephalopoda Nautilida Ostreidae Shell morphology affects multiple aspects of the biology of ectocochleate cephalopods (e.g., floatability, life habit, post mortem behavior of the shell, etc.), so it should impact the establishment and development of sclerobiont faunas as well. In this study, the sclerobiont faunas of Weavericeras vacaense (a spherocone) and Holcoptychites agrioensis (a discocone), two early Hauterivian ammonites from the Agrio Formation (Neuquén Basin, Argentina) were compared. The coeval nautilid Cymatoceras perstriatum (studied previously), was contrasted with both ammonites. Results show that the three sclerobiont faunas had similar abundance, taxonomic composition and distribution of individuals across the shells, but H. agrioensis showed a markedly reduced richness, with a fauna almost entirely composed by the oyster Amphidonte (Ceratostreon) sp. The more evolute and compressed H. agrioensis sank more quickly than W. vacaense and C. perstriatum, which may have undergone longer periods of flotation and exposure on the sea bottom. This agrees with the lower taxonomic richness of the sclerobiont fauna and a better overall preservation of H. agrioensis specimens. Differences in the sclerobiont faunas are greater across variations in shell inflation and coiling degree than across nautilids and ammonites; therefore, the latter are important parameters for the sclerobiont fauna as well since they impact how long shells will float and be exposed on the seafloor, and therefore on their time of exposure. The presence of an almost monospecific fauna in H. agrioensis, despite its rapid sinking and burial, indicates that Amphidonte (Ceratostreon) sp. was the earliest settler, and could abundantly colonize hard substrates in a short time. © Copyright 2016, SEPM Society for Sedimentary Geology. Fil:Luci, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cichowolski, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aguirre-Urreta, M.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08831351_v31_n2_p41_Luci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic biostratigraphy
burial diagenesis
fauna
Hauterivian
mollusc
morphology
preservation
shell
species richness
substrate
Argentina
Cephalopoda
Nautilida
Ostreidae
spellingShingle biostratigraphy
burial diagenesis
fauna
Hauterivian
mollusc
morphology
preservation
shell
species richness
substrate
Argentina
Cephalopoda
Nautilida
Ostreidae
Luci, L.
Cichowolski, M.
Aguirre-Urreta, M.B.
Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
topic_facet biostratigraphy
burial diagenesis
fauna
Hauterivian
mollusc
morphology
preservation
shell
species richness
substrate
Argentina
Cephalopoda
Nautilida
Ostreidae
description Shell morphology affects multiple aspects of the biology of ectocochleate cephalopods (e.g., floatability, life habit, post mortem behavior of the shell, etc.), so it should impact the establishment and development of sclerobiont faunas as well. In this study, the sclerobiont faunas of Weavericeras vacaense (a spherocone) and Holcoptychites agrioensis (a discocone), two early Hauterivian ammonites from the Agrio Formation (Neuquén Basin, Argentina) were compared. The coeval nautilid Cymatoceras perstriatum (studied previously), was contrasted with both ammonites. Results show that the three sclerobiont faunas had similar abundance, taxonomic composition and distribution of individuals across the shells, but H. agrioensis showed a markedly reduced richness, with a fauna almost entirely composed by the oyster Amphidonte (Ceratostreon) sp. The more evolute and compressed H. agrioensis sank more quickly than W. vacaense and C. perstriatum, which may have undergone longer periods of flotation and exposure on the sea bottom. This agrees with the lower taxonomic richness of the sclerobiont fauna and a better overall preservation of H. agrioensis specimens. Differences in the sclerobiont faunas are greater across variations in shell inflation and coiling degree than across nautilids and ammonites; therefore, the latter are important parameters for the sclerobiont fauna as well since they impact how long shells will float and be exposed on the seafloor, and therefore on their time of exposure. The presence of an almost monospecific fauna in H. agrioensis, despite its rapid sinking and burial, indicates that Amphidonte (Ceratostreon) sp. was the earliest settler, and could abundantly colonize hard substrates in a short time. © Copyright 2016, SEPM Society for Sedimentary Geology.
format JOUR
author Luci, L.
Cichowolski, M.
Aguirre-Urreta, M.B.
author_facet Luci, L.
Cichowolski, M.
Aguirre-Urreta, M.B.
author_sort Luci, L.
title Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
title_short Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
title_full Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
title_fullStr Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
title_full_unstemmed Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina
title_sort sclerobionts, shell morphology and biostratinomy on ammonites: two early cretaceous cases from the neuquén basin, argentina
url http://hdl.handle.net/20.500.12110/paper_08831351_v31_n2_p41_Luci
work_keys_str_mv AT lucil sclerobiontsshellmorphologyandbiostratinomyonammonitestwoearlycretaceouscasesfromtheneuquenbasinargentina
AT cichowolskim sclerobiontsshellmorphologyandbiostratinomyonammonitestwoearlycretaceouscasesfromtheneuquenbasinargentina
AT aguirreurretamb sclerobiontsshellmorphologyandbiostratinomyonammonitestwoearlycretaceouscasesfromtheneuquenbasinargentina
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