6533b861fe1ef96bd12c4c1c

RESEARCH PRODUCT

Modalités évolutives du genre bullatimorphites (Ammonitina) au Bathonien-Callovien (Jurassique moyen) en Europe occidentale

Jacques ThierryJacques ThierryÉLie CarioubPhilippe CourvillePhilippe Courville

subject

PaleontologyExtinctionbiologyGenusAmmonitinaLineage (evolution)PhanerozoicOcean EngineeringAmmonoideaMesozoicBiostratigraphybiology.organism_classificationEcology Evolution Behavior and Systematics

description

Abstract The genus Bullatimorphites, (macroconchs Bullatimorphites, Kheraiceras; microconchs Bomburites, Schwandorfia, Spbaeroptycbius, Treptoceras), is characterized by an ontogenesis with three morphologic phases: serpenticone, sphaerocone and ellipticone. Within the successive populations, the relative development of these morphologies allows the defined species to be placed in an evolutive and stratigraphic lineage. The history of the genus comprises five steps: 1) emergence (Early Middle Bathonian), 2) first gradual evolution (Middle-Upper Bathonian), 3) first morphological diversification (Uppermost Bathonian), 4) second gradual evolution, 5) second morphological diversification and extinction (Lower Callovian). Such events are biostratigraphic datum lines which coincide with the palaeogeographic evolution of the West Peri-Tethyan platforms during the Middle Jurassic.

yearjournalcountryeditionlanguage
1999-01-01Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science
https://doi.org/10.1016/s1251-8050(99)80088-3