New insights into the taxonomy and evolution of Jurassic planktonic foraminifera

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 thin sections. We consider to a possible forerunner Conoglobigerina helvetojurassica (Haeusler), first foraminiferal reticulate wall texture. Currently, is only known In some localities, specimens posses additional apertural opening, often lacking rim; function enigmatic. The postulated lineage balakhmatovae (Morozova) Cretaceous Clavihedbergella eocretacea Neagu refined description Petaloglobigerina simmonsi gen., Kimmeridgian Portugal. transition P. occurs by means ontogenic development petaloid test, pronounced flattening whorl ovate chambers, last ones offset twisted. foraminifera, now consist three genera 12+ underwent long periods stasis, interrupted late Bajocian, mid-Oxfordian evolution. ‘stasis root’ taxa , bathoniana balakhmat ovae geographically widespread lower mid palaeo-latitudes, stratigraphically ranging within Late Jurassic. Modern digital microscopes, co-axial side LED lighting excellent image stacking software important tools study fast cost-effective communication modern micropalaeontology.