6533b7d7fe1ef96bd1267c00
RESEARCH PRODUCT
Évolution rétrograde de Neospathodus au cours de la crise Permo - Triasique
Francis HirschPablo PlasenciaAli Murat KiliçJean GuexKeisuke Ishidasubject
010506 paleontologyLineage (genetic)ExtinctionPermianbiologyEvolutionTriasConodontsPaleontologyÉvolutionProteromorphosis010502 geochemistry & geophysicsbiology.organism_classificationTriassic01 natural sciencesEnvironmental stressPaleontologyPhylogenèseTriasAtavismPeriod (geology)ConodontesProtéromorphosePhylogeny0105 earth and related environmental sciencesdescription
The Permian - Triassic evolution of platform conodonts (Gondolellidae) consists mainly in developing the carina and the platform. During the sublethal environmental stress conditions subsequent to the Permian - Triassic extinction, the Wuchiapingian - Griesbachian Clarkina lineage is replaced by the primitive looking platform-lacking Dienerian - Aegean Neospathodus kummeli - Kashmirella timorensis lineage. Moreover, above Jinogondolella denticulata, end of the Capitanian Jinogondolella lineage, “Neospathodus” arcucristatus, an atavistic blade-like homeomorph that lacks a platform, underlies Protoclarkina crofti, of the base of the anagenetic Clarkina lineage. These primitive-looking forms are derived from their immediate ancestors by retrograde evolution, a phenomenon that has been described as proteromorphosis. Such events suggest that proteromorphosis occurs during periods of crisis, with sudden reappearance of homeomorphic forms that are atavistic representatives of the clade. The phenomenon is further substantiated by several additional retrogradations that pace the Triassic, a period prone to such events.
year | journal | country | edition | language |
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2016-02-10 | Revue de Micropaléontologie |