sentences:  McKenna and Bell recognized two subfamilies (Plesiadapinae and Saxonellinae) and one unassigned genus ("Pandemonium") within Plesiadapidae.More recently "Saxonella" (the only saxonelline) and "Pandemonium" have been excluded from the family, leaving only a redundant Plesiadapinae.Within the family, "Pronothodectes" is the likely ancestor of all other genera, while "Plesiadapis" may be directly ancestral to both "Chiromyoides" and "Platychoerops".