Abstract Globuligerina glinskikhae nov. sp. Gradstein & Waskowska and waskowskae are new species of Jurassic planktonic foraminifera from the Middle Dagestan Poland. G. with its remarkable ‘protoglobigerine’ test may be an early evolutionary offshoot oxfordiana (Grigelis). It index taxon for upper Bajocian through Bathonian strata in Eastern Europe Southwest Asia, might recognizable also th...

The breakup of Pangaea and the rapid opening Ligurian Central Atlantic oceans during Middle Jurassic resulted in widespread volcanism accompanied by significant shifts global environments, climates, floras. Although major is a plausible driver such changes, linking these phenomena hindered lack detailed sedimentary records from which to evaluate cause effect. Here, we link environmental, climat...

A large suite of specimens belonging to the Early Bajocian Stephanoceras from Évrecy (Normandy, France) displays wide variation in conch and sculpture. The quantitative analysis geometry its ontogeny on basis more than 50 sectioned reveals major problems separation species within assemblage; clear morphological boundaries between possible cannot be established. material shows sculpture paramete...