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Article: Decapod Crustacea from the Agrio Formation (Lower Cretaceous) of the Neuquén Basin, Argentina

Publication: Palaeontology
Volume: 55
Part: 5
Publication Date: September 2012
Page(s): 1091 1103
Author(s): <p>Beatriz Aguirre-Urreta, Dar&iacute;o G. Lazo and Peter F. Rawson</p>
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How to Cite

AGUIRRE-URRETA, B., LAZO, D. G., RAWSON, P. F. 2012. Decapod Crustacea from the Agrio Formation (Lower Cretaceous) of the Neuquén Basin, Argentina. Palaeontology55, 5, 1091–1103.

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Two species of decapod crustacean are recorded from the Agua de la Mula Member of the Agrio Formation (Upper Hauterivian – Lower Barremian) of the Neuquén Basin of west-central Argentina, namely Astacodes falcifer Bell and a new species of Palaeohomarus, P. pacificus. The preservation of the specimens is exceptional, some showing delicate compound eyes and a stridulatory apparatus, features rarely found in fossil forms. Many specimens are preserved articulated inside calcareous nodules, within dark-grey shales. The lobster-bearing sediments accumulated in a low-energy marine environment and diagenetic mineralization occurred very rapidly, prior to significant decay, thus allowing exceptional preservation of specimens. Palaeohomarus was a rare genus in the Cretaceous with a palaeogeographic distribution restricted to the Mediterranean Tethys, the eastern USA and Madagascar, while Astacodes falcifer has been recorded only from Speeton (eastern England) and Neuquén.

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