Volaticotherium antiquus (Meng et al. 2006; ?Middle Jurassic to ?Earliest Cretaceous, 164 mya; 3 cm skull length; IVPP V14739; Figs. 1-3) was described a few years back as a gliding mammal, based on a preserved patagium, or gliding membrane, complete with short hair and skin. Derived from a sister to Monodelphis, Volaticotherium may represent the first of many of its kind, or the last of its kind. Docofossor is a fossorial (digging) sister.
The molars resemble rotary saw blades, the external naris is divided by an ascending process of the premaxilla (rare among higher cynodonts and mammals), proximally the femur has no 'neck' and not much of a 'head', and the tail is extraordinarily long. Not listed by Meng et al., The mandible is not gently convex, as in Monodelphis and most other basal and stem mammals, but is sharply convex ventral to the canines, the gently concave, a shape not otherwise seen until higher primates. We also see a deeper mandible medial to sabertooth fangs in Thylacosmilus, and this may be the reason for the oddly deeper chin here.