BROMALITOS DE LA FORMACIÓN AMEGHINO (=NORDENSKJÖLD) JURASICO SUPERIOR DE LA PENÍNSULA ANTÁRTICA
DOI:
https://doi.org/10.5710/PEAPA.11.04.2023.446Palabras clave:
Coprolitos, Restos de actinopterigios, Vertebrados macropredadores, Antártida Occidental, Longing GapResumen
Presentamos el estudio de los bromalitos recuperados de la Formación Ameghino (=Nordenskjöld) del Jurásico Superior en Longing Gap, en la Península Antártica. El material fue analizado morfológica y químicamente. Realizamos un estudio cualitativo y un análisis tafonómico de los especímenes y pusimos a prueba hipótesis paleobiológicas y paleoecológicas. Concluimos que las muestras analizadas son coprolitos y proponemos un nuevo icnotaxón, Antarctoscoprus longinensis ichnogen. e ichnosp. nov., caracterizado por ser un coprolito pequeño y plano que se diferencia de otros icnogéneros por su composición, que consiste principalmente en restos de actinopterigios (por ejemplo, escamas, vértebras, huesos del cráneo y dientes). Antarctoscoprus longinensis incluye tres morfotipos (es decir, circular, subcircular y alargado) derivados de una forma original tridimensional alargada por compactación. Basándonos en el contenido interno, los productores de los coprolitos eran depredadores carnívoros, putativamente un taxón ictiófago. Debido a la abundancia de actinopterigios—principalmente aspidorrínquidos e ictiodéctidos—y al tamaño de los coprolitos, proponemos a los peces macrófagos como supuestos productores. Los cadáveres de peces y los coprolitos, en su mayoría intactos, nos permiten llevar a cabo nuevos estudios que podrían conducir a una mejor comprensión de las antiguas comunidades que vivían en el Mar Jurásico Tardío que rodeaba la Antártida.
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