Fig. 2: Skull morphology of Microtherulum.
From: Middle ear innovation in Early Cretaceous eutherian mammals
a, b Virtual reconstruction of the skull in dorsal (a) and ventral (b) views. c Left upper cheek teeth in occlusal view. d Right upper cheek teeth in occlusal view. e, g Left mandibles in lateral (e), occlusal (f), and medial (g) views. h, j Right mandible in lateral (h), occlusal (i), and medial (j) views. ap angular process, C stylar cusp C, “C” stylar cusp in postmetacrista, ci crista interfenestralis, cor coronoid process, D stylar cusp D, ec ectoflexus, ect ectotympanic, end entoconid, f frontal, fc fenestra cochleae, fv fenestra vestibuli, gf glenoid fossa, hcd hypoconid, hcld hypoconulid, hf hypoglossal foramen, hy hyoids, I1-5 upper incisors 1-5, i1-4 lower incisors 1-4, j jugal, ma maxilla, maf masseteric fossa, mc mandibular condyle, me metacone, med metaconid, mef mental foramen, mes metastyle, n nasal, oc occipital, occ occipital condyle, on odontoid notch, P4-M3 penultimate and ultimate upper premolars (P4 and P5), and upper molars M1, M2, and M3, pa parietal, par paracone, pacl paraconule, pad paraconid, pas parastyle, pgp postglenoid process, pm premaxilla, pps preparastyle, pr promontorium, prd protoconid, prt protocone, ptp posttympanic process, sp septomaxilla, sq squamosal, st stylocone.
