- X=occurring genus; (number)=number of species of this genus recorded if more than one.*=genus having first appearance in the Valanginian. ^=taxon belonging to modern microstructural group. Switzerland (I)=Vitznau Marl at Wart; (II)=non-Vitznau Marl. For further details regarding recognized species in previously described works see Appendix Table 6. (**)=Information regarding taxon described from strata older than the Valanginian provided below