length of pars cochlearis; (1) short, length between 88% and 119% of the promontorial length; (2) slightly longer than pars cochlearis, length between 131% and 153%; (3) long, length between 191% and 404%; (4) very long, length > 613% of the length of pars cochlearis. 246. (0) forms an angle < 130° with the long Orientation of posterior process of petrosal: axis of tegmen tympani; (1) forms an angle between 135° and 165°; (2) directed nearly posteriorly, forms an 180° with tegmen tympani. 247. (0) straight or Dorsal edge of posterior process, petrosal in lateral or medial view: convex ventrally; (1) concave ventrally, helps to form the neck of posterior process of 248. (0) robust; (1) horizontal plate and very thin for most Posterior process of petrosal: of its length. 249. (0) Mastoid exposure of posterior process of petrosal on the outside of skull: exposed externally; (1) not exposed, enclosed by the exoccipital and squamosal. 250. (0) absent; (1) present Anterior spine, or conical anterior tip, of ectotympanic bulla: but small; (2) present and long. 251. (0) narrow and long, width of bulla at sigmoid process Shape of ectotympanic bulla: is < 64% the length of bulla along its long axis; (1) wide, width of bulla > 65% of its long axis. 252. (0) forms a smooth curve around posterior part Posterior end of ventromedial keel: of involucrum; (1) protrudes and points medially. 253. (0) absent; (1) present. Accessory ossicle: 254. (0) small and oblong; (1) large and subspherical. Accessory ossicle:
length of pars cochlearis; (1) short, length between 88% and 119% of the promontorial length; (2) slightly longer than pars cochlearis, length between 131% and 153%; (3) long, length between 191% and 404%; (4) very long, length > 613% of the length of pars cochlearis. 246. Orientation of posterior process of petrosal: (0) forms an angle < 130° with the long axis of tegmen tympani; (1) forms an angle between 135° and 165°; (2) directed nearly posteriorly, forms an 180° with tegmen tympani. 247. Dorsal edge of posterior process, petrosal in lateral or medial view: (0) straight or convex ventrally; (1) concave ventrally, helps to form the neck of posterior process of 248. Posterior process of petrosal: (0) robust; (1) horizontal plate and very thin for most of its length. 249. Mastoid exposure of posterior process of petrosal on the outside of skull: (0) exposed externally; (1) not exposed, enclosed by the exoccipital and squamosal. 250. Anterior spine, or conical anterior tip, of ectotympanic bulla: (0) absent; (1) present but small; (2) present and long. 251. Shape of ectotympanic bulla: (0) narrow and long, width of bulla at sigmoid process is < 64% the length of bulla along its long axis; (1) wide, width of bulla > 65% of its long axis. 252. Posterior end of ventromedial keel: (0) forms a smooth curve around posterior part of involucrum; (1) protrudes and points medially. 253. Accessory ossicle: (0) absent; (1) present. 254. Accessory ossicle: (0) small and oblong; (1) large and subspherical.
SuppFiles1_Isthminia_matrix.docx