Microfossils incertae sedis from the Upper Jurassic and Lower Cretaceous of Cuba

The problematic microfossils Globochaete alpina Lombard and Eothrix alpina Lombard? are recorded from Portlandian limestones (Upper Jurassic) of Cuba. The new genera Favreina and Lombardia are introduced for other enigmatic forms from Upper Jurassic beds. Ten species of Nannoconus, which have proved useful in zoning Lower Cretaceous limestones in Cuba, are recognized. Their nomenclature and morphology are discussed in detail.