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Artículo

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

Luci, LeticiaIcon ; Cichowolski, MarcelaIcon ; Aguirre-Urreta, Maria BeatrizIcon
Fecha de publicación: 02/2016
Editorial: Society for Sedimentary Geology
Revista: Palaios
ISSN: 0883-1351
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geociencias multidisciplinaria

Resumen

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.
Palabras clave: Hard Sustrate Fauna , Encrustation , Ammonite Taphonomy , Nekroplanctonic Drift
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/60166
DOI: http://dx.doi.org/10.2110/palo.2015.052
URL: https://pubs.geoscienceworld.org/sepm/palaios/article/31/2/41/100168/SCLEROBIONT
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Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Citación
Luci, Leticia; Cichowolski, Marcela; Aguirre-Urreta, Maria Beatriz; Sclerobionts, shell morphology and biostratinomy on ammonites: Two early cretaceous cases from the Neuquén basin, Argentina; Society for Sedimentary Geology; Palaios; 31; 2; 2-2016; 41-54
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