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10 - Crustacea of the Crato Formation

Published online by Cambridge University Press:  22 August 2009

David M. Martill
Affiliation:
University of Portsmouth
Günter Bechly
Affiliation:
Staatliches Museum für Naturkunde, Stuttgart
Robert F. Loveridge
Affiliation:
University of Portsmouth
Günter Schweigert
Affiliation:
Staatliches Museum für Naturkunde, Abteilung Paläontologie, Rosenstein 1, D-70191 Stuttgart, Germany
David M. Martill
Affiliation:
Reader in Palaeobiology in the School of Earth and Environmental Sciences University of Portsmouth
Mark Williams
Affiliation:
Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
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Summary

Although crustaceans are often abundant and diverse in fossil Konservat Lagerstätten, their remains are remarkably rare in the Nova Olinda Member and, indeed, they are only abundant at a few localized horizons in the Crato Formation as a whole. Reasons for this rarity compared with other fossil Lagerstätten are unclear, but are probably related to salinity levels and substrate chemistry. By far the most abundant crustaceans are ostracods, which occur in rock-forming quantities in shales and fissile laminated muddy limestones at the transition between the Rio da Batateiras Formation and the Crato Formation at Cascata, near Crato. In these same deposits conchostracans occur with the ostracods at Cascata, although they are not as abundant, and in dark-coloured silty shales beneath a series of laminated limestones at Estiva, near Araporanga. Here they occur without ostracods, but in a sequence that is similar to, though slightly younger than, that at Cascata. Decapod crustaceans have only been reported from the laminites of the Nova Olinda Member in the Crato Formation.

Decapoda: Beurlenia, the ‘sole’ shrimp from the Crato Formation

The Crato Formation yields only a single species of decapod crustacean: Beurlenia araripensis. Originally described as a palaemonid shrimp by Martins-Neto and Mezzalira (1991), Maisey and Carvalho (1995) cast doubt on its palaemonid affinities, referring it to? Palaemonidae. Palaemonids are a family within Caridea that are scarcely recorded from the fossil record. We here concur with Maisey and Carvalho (1995) and transfer B. araripensis to Familia incertae sedis within Caridea.

Type
Chapter
Information
The Crato Fossil Beds of Brazil
Window into an Ancient World
, pp. 133 - 141
Publisher: Cambridge University Press
Print publication year: 2007

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