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Ameghiniana 38(4) >

Bioturbaciones de Tagelus plebeius (Lightfoot, 1786) (Mollusca: Bivalvia) en un ambiente estuárico holoceno (río Quequén Grande, Buenos Aires, Argentina)

Claudio Germán DE FRANCESCO y Marcelo Arístides ZÁRATE

Ameghiniana 38: 467-470. Buenos Aires. ISSN 0002-7014 AMGHB2

Abstract. TAGELUS PLEBEIUS (LIGHTFOOT, 1786) (MOLLUSCA: BIVALVIA) BIOTURBATIONS IN A HOLOCENE ESTUARINE ENVIRONMENT (QUEQUÉN GRANDE RIVER, BUENOS AIRES PROVINCE, ARGENTINA). Elongated traces, showing a lower v-shape closed end have been identified in mid Holocene estuarine deposits exposed along the lower reach of the Quequén Grande River, Argentina (38º34'35" S and 58º42'45" W) associated with shells in life position of the infaunal bivalve Tagelus plebeius (Lightfoot). These traces, located in a stratigraphic level dated in circa 6,900 years 14C B.P., were originated by the burrowing activity of T. plebeius based upon the comparison of their morphological characteristics (width, general shape, colour) with those of T. plebeius and the traces resulting from its burrowing activity at present estuarine environments of the region. The high percentages of the estuarine gastropod Heleobia australis (d'Orbigny) found in the sedimentary filling of the traces come from the overlying strata, abundant in Heleobia australis remains. The traces are stratigraphically transgressive within a depth interval of up to 80 cm.

Key words. Bioturbation. Trace fossils. Tagelus plebeius. Holocene. Taphonomy. Heleobia. Buenos Aires. Argentina.

Palabras clave. Bioturbación. Trazas fósiles. Tagelus plebeius. Holoceno. Tafonomía. Heleobia. Buenos Aires. Argentina.

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