Fig. 1 in A New Species of the Rodent Genus Oecomys (Cricetidae: Sigmodontinae: Oryzomyini) from Eastern Bolivia, with Emended Definitions of O. concolor (Wagner) and O. mamorae (Thomas)

Fig. 1. Ventromedial view of right otic capsule in two species of Oecomys illustrating osseous traits associated with complete and derived carotid circulatory patterns (see text and table 1). Top, O. concolor (AMNH 78073, an adult from Río Casiquiare, Amazonas, Venezuela); bottom, O. bicolor (USNM 559396, an adult female from Pakitza, Madre de Dios, Peru). Abbreviations: ab, auditory bulla (ectotympanic); bet, bony eustachian tube; bo, basioccipital; cc, carotid canal; iag, groove for the infraorbital branch of the stapedial artery; pac, posterior opening to the alisphenoid canal; pf, parapterygoid fossa; pt, pteriotic (petrous portion of petro-mastoid); stf, stapedial foramen.