Early–middle Jurassic lytoceratid ammonites with constrictions from Morocco: palaeobiogeographical and evolutionary implications. - Archive ouverte HAL Access content directly
Journal Articles Palaeontology Year : 2008

Early–middle Jurassic lytoceratid ammonites with constrictions from Morocco: palaeobiogeographical and evolutionary implications.

Raphaël Bourillot
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Pascal Neige
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Aurélien Pierre
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Christophe Durlet
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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'.

Dates and versions

hal-00276563 , version 1 (30-04-2008)

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Raphaël Bourillot, Pascal Neige, Aurélien Pierre, Christophe Durlet. Early–middle Jurassic lytoceratid ammonites with constrictions from Morocco: palaeobiogeographical and evolutionary implications.. Palaeontology, 2008, 51 (3), pp.597-609. ⟨10.1111/j.1475-4983.2008.00766.x⟩. ⟨hal-00276563⟩
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