FIG. 12 in Caudal Cranium Of Thylacosmilus Atrox (Mammalia, Metatheria, Sparassodonta), A South American Predaceous Sabertooth

FIG. 12. Thylacosmilus atrox, paratype, FMNH P14344. Digital reconstruction of the fragmentary left ectotympanic based on micro-CT data in A, rostral, B, lateral, and C, medial views. D, horizontal section of the left middle ear in dorsal view, showing fragments of ectotympanic (asterisk, *). Abbreviations: BO, basioccipital; cac, caudal crus;?chtym, groove for chorda tympani nerve (CNVII); ctpsq, caudal tympanic process of squamosal; cty, crista tympani; eam, external acoustic meatus; EC, ectotympanic; jfis, jugular fissure;?gma, groove for rostral process of malleus; lps, lateral paratympanic space (= epitympanic sinus); pgc, postglenoid canal; roc, rostral crus; rtpsq, rostral tympanic process of squamosal; SQ, squamosal; stp, styliform process (= anterolateral process of ectotympanic); tpex, tympanic process of exoccipital.