ИСТИНА

This study attempts to synthesize the taxonomy, stratigraphy, paleoecology and paleogeography of the Jurassic planktonic foraminifera (for now in draft manuscript abreviated as JPF). Two genera (Globuligerina and Conoglobigerina) and 10 species are defined, ranging from Bajocian through Tithonian. Two taxa are described as new forms, Globuligerina tojeiraensis Gradstein and Conoglobigerina grigelisi Gradstein. Rich and diversified (!) assemblages of JPF from Eastern Canada, Portugal and Dagestan are paramount to understand morphological variability and zonation of taxa. Jurassic planktonic foraminifera are given subspecies, species or even genus rank. Such features include test size, aberrant coiling mode, aperture shape and slight shifts in aperture position. Also, earlier studies did not effectively use wall surface patterns for taxonomy, as now paramount in Cretaceous and Cenozoic planktonic foraminiferal systematics. Taxonomic splitting, instead of population –type taxonomy makes it more difficult to deduce stratigraphic ranges, paleoecology, paleobiogeography and phylogeny. Our taxonomy links to that employed for Cretaceous planktonic foraminifera (CPF; Petrizzo et al., in prep). Emphasis is placed on overall building plan, chamber coiling, chamber shape, (micro-) perforation and wall surface ornamentation with pustules, pseudo murica (pointed pustules) and ridges, and networks of ridges. Aperture shape and placement varies within and between taxa; it is not given generic rank.