Tertiary freshwater Decapoda (Crustacea: Parastacidae) from the Ñirihuau Basin, Patagonia, Argentina

Very well preserved specimens of a macruran decapod from the Lower (Lacustrine) Member of the Ñirihuau Formation, northwestern Patagonia, Argentina, permitted description of Lammuastacus longirostris, a new genus and species of Parastacidae. The sedimentological and paleontological evidences provide...

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Bibliographic Details
Published in:Journal of paleontology 1992-09, Vol.66 (5), p.817-825
Main Author: Aguirre-Urreta, Maria B.
Format: Article
Language:English
Subjects:
Abdomen
Arroyos
Crayfish
Fossils
Fresh water
Freshwater
Freshwater environments
Genera
Geological facies
Geology
Insect antennae
Lammuastacus longirostris
Paleontology
Parastacidae
Shales
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Description
Summary:Very well preserved specimens of a macruran decapod from the Lower (Lacustrine) Member of the Ñirihuau Formation, northwestern Patagonia, Argentina, permitted description of Lammuastacus longirostris, a new genus and species of Parastacidae. The sedimentological and paleontological evidences provided by the faunal assemblage indicate a freshwater environment. This is the first certain record of a fossil Parastacidae from Tertiary deposits, most probably Oligocene. The fossil material shows similarities with Geocharax, the extant Australian genus considered to retain many primitive characters, and other related genera from New Zealand and Chile.
ISSN:0022-3360
1937-2337
DOI:10.1017/S0022336000020825