Aplodontidae

Pfaff, Cathrin, Martin, Thomas & Ruf, Irina, 2015, BSeptal compass ^ and Bseptal formula ^: a new method for phylogenetic investigations of the middle ear region in the squirrel-related clade (Rodentia: Mammalia), Organisms Diversity & Evolution (New York, N. Y.) 15 (4), pp. 721-730 : 726

Aplodontidae

A spongy meshwork of bony trabeculae characterizes the entire middle ear region in all investigated specimens of A. rufa ( Fig. S2 A ). The septal compass and the septal formula cannot be applied.

Figures

Fig. 2 Septal compass: general graphical illustration of the anatomy of the right middle ear region with the relative position of the primary septa (I–III) and the secondary septa (A, B, a). One asterisk (a*) indicates the Blateral secondary septum^ of MacPhee (1981), two asterisks (**) indicate the Banterior septum^ of Wible (2009). cty cavum tympani (=tympanic cavity), fsa fossa subarcuata (=subarcuate fossa), rec recessus epitympanicus (=epitympanic recess)