Selaginella and Desfontainia, are what kind of item?
Selaginella Selaginella is the sole genus of primitive vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses.
Desmostylia The Desmostylia (from Greek δεσμά "desma", "bundle", and στῦλος "stylos", "pillar") are an extinct order of aquatic mammals that existed from the late Oligocene (Arikareean) to the late Miocene (Tortonian) ().