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- Title
EARLY–MIDDLE JURASSIC LYTOCERATID AMMONITES WITH CONSTRICTIONS FROM MOROCCO: PALAEOBIOGEOGRAPHICAL AND EVOLUTIONARY IMPLICATIONS.
- Authors
Bourillot, Raphael; Neige, Pascal; Pierre, Aurelien; Durlet, Christophe
- Abstract
The ammonite genus Alocolytoceras Hyatt, 1900 is an uncommon lytoceratid with distinctive shell ornament. A set of 58 specimens, recently collected at Amellago in the central High Atlas (Morocco), has enabled us to trace a succession of three species over eight biozones from the Toarcian to the Aalenian. Two specimens from the Lusitanian Basin are added for comparison. Following a review of the genus, based on original specimens and data from the literature, seven species are considered valid. A palaeobiogeographical synthesis of 13 regions demonstrates irregular distribution patterns over time, with a constant presence in the south-west Tethys and an instance of rapid diversification of an endemic fauna in north-west Europe. Our data challenge the conventional view that lytoceratid ammonite evolution was ‘conservative’.
- Subjects
HIGH Atlas Mountains (Morocco); MOROCCO; LYTOCERATIDAE; AMMONOIDEA; SPECIES; ANIMALS; JURASSIC paleoecology; JURASSIC stratigraphic geology
- Publication
Palaeontology, 2008, Vol 51, Issue 3, p597
- ISSN
0031-0239
- Publication type
Article
- DOI
10.1111/j.1475-4983.2008.00766.x