Palaeoenviromental and palaeogeographical traits on deep-water ostracod assemblages from the Lower Pleistocene sediments along the Ionian side of Mount Etna (Sicily, Italy)

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URI: http://hdl.handle.net/2042/57945  |   DOI : https://doi.org/10.4267/2042/57945
Title: Palaeoenviromental and palaeogeographical traits on deep-water ostracod assemblages from the Lower Pleistocene sediments along the Ionian side of Mount Etna (Sicily, Italy)
Author: Sciuto, Francesco
Abstract: The ostracod associations of the Lower Pleistocene sedimentary succession cropping out at Serra San Biagio (Catania, Sicily NE) have been investigated. The ostracod fauna from nine samples is poorly diversified but well-preserved: A total of forty taxa of ostracods have been identified, thirty-three at specific level and seven at genus level or doubtful species. Thirty species are considered as constituents of the in situ original assemblages. The associations consist almost exclusively of bathyal taxa such as Bythocypris obtusata (SARS), Anchistrocheles antemacella MADDOCKS, Henryhowella ex H. hirta (COSTA) group, Quasibuntonia radiatopora (SEGUENZA), Retibythere (Bathybythere) scaberrima (BRADY) and Bathycythere vansraateni SISSINGH. Also the Krithe group is well-represented with Krithe compressa (SEGUENZA) and K. pernoides (BORNEMANN). Almost all species, some, particularly interesting from the palaeoecological and palaeogeographical point of view, have been here described, illustrated and commented on, including a species belonging to the genus Cytherella JONES, 1849, found in all samples of the section, which is here proposed as new.Nous avons étudié les associations d'ostracodes de la série sédimentaire d'âge Pléistocène inférieur affleurant à Serra San Biagio (Catane, NE Sicile). La faune d'ostracodes de neuf échantillons est peu diversifiée mais bien préservée : 40 taxons y ont été identifiés, trente-trois au niveau de l'espèce et sept au niveau du genre ou d'espèces discutables. Trente espèces sont considérées comme appartenant aux associations primaires autochtones. Les associations se composent presque exclu-sivement de taxons bathyaux tels que Bythocypris obtusata (SARS), Anchistrocheles antemacella MAD-DOCKS, Henryhowella ex groupe H. hirta (COSTA), Quasibuntonia radiatopora (SEGUENZA), Retibythere (Bathybythere) scaberrima (BRADY) et Bathycythere vanstraateni SISSINGH. Le groupe Krithe est aussi bien représenté avec Krithe compressa (SEGUENZA) et K. pernoides (BORNEMANN). Presque toutes les espèces, dont certaines, particulièrement intéressantes du point de vue paléoécologique et paléogéo-graphique, ont été ici décrites, illustrées et commentées ; une de ces espèces, attribuée au genre Cytherella JONES, 1849, et observée dans tous les échantillons de la coupe, est nouvelle et fait l'objet d'une description.Sono state studiate le associazioni ostracodi della successione sedimentaria del Pleistocene Inferiore affiorante a Serra San Biagio (Catania, Sicilia NE). La fauna è spesso poco diversificata ma ben conservata: sono state determinati 40 taxa, 33 a livello specifico, 7 a livello generico. L'associazione consiste quasi esclusivamente di taxa batiali come Bythocypris obtusata (Sars), Anchistrocheles antemacella Maddocks, Henryhowella ex H. hirta (Costa) group, Quasibuntonia radiatopora (Seguenza), Retibythere (Bathybythere) scaberrima (Brady) e Bathycythere vansraateni Sissingh. Anche il gruppo dei Krithe è ben rappresentato con Krithe compressa (Seguenza) e K. pernoides (Bornemann). Nel presente lavoro, inoltre, sono state descritte, illustrate e commentate più in dettaglio alcune specie particolarmente significative dal punto di vista paleoecologico e paleogeografico. Tra di esse una, rinvenuta lungo tutta la sezione ed appartenente al genere Cytherella Jones, 1849, viene proposta come nuova.
Subject: Marine ostracods; bathyal; palaeogeography; palaeoenvironment; new species; Early Pleistocene; blue clays; Mount Etna; Sicily; ostracodes marins; étage bathyal; paléogéographie; paléoenvironnement; nouvelle espèce; Pléistocène inférieur; argiles bleues; Etna; Sicile
Publisher: Association "Carnets de Géologie"
Date: 2015-11

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