Thucydiaceae fam. nov.

Small, eustelic coniferous trees with dense wood and resin canals in pith. Helically arranged simple leaves on all orders of branching. Fertile organs consisting of compound pollen cones and compound ovulate fertile zones occurring between vegetative zones on branch. Pollen cones with helically arranged bracts and axillary dwarf shoots; sterile scales borne toward bract and laterally; sporophylls with one terminal erect pollen sac borne toward cone axis. Prepollen grains monosaccate, eusaccate. Ovulate dwarf shoots bilateral, with sterile scales all around base of dwarf shoot; sporophylls terminal with recurved apex, each with apical inverted ovule. Ovules flattened, with peripheral wing.