Synonymer & Oplysninger om | engelsk ord ECTOTYMPANIC

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Eksempler på brug af ECTOTYMPANIC i en sætning

• A study done in 1987 linked Plesiadapiformes with adapids and omomyids through nine shared-derived features, six of which are cranial or dental: (1) auditory bulla inflated and formed by the petrosal bone, (2) ectotympanic expanded laterally and fused medially to the wall of the bulla, (3) promontorium centrally positioned in the bulla, and large hypotympanic sinus widely separating promontorium from the basisphenoid, (4) internal carotid entering the bulla posteriolaterally and enclosed in a bony tube, (5) nannopithex fold on the upper molars, and (6) loss of one pair of incisors.
• Morphologically, Hesperolemur is distinct from other notharctine taxa in having a partially fused ectotympanic anulus in the auditory bulla, no stapedial artery, and no lower molar paraconids.
• Pelycodus is placed within adapiforms because of its annular ectotympanic, small eyes, non-elongated tarsus and numerous premolar and molar crests and within Notharctinae because of its four premolars, unfused mandible, a hypocone derived from the postprotocingulum and a lacrimal bone within the orbit.
• For example, it lacks the advanced frontal sinus found in living hominoids, but it does possess a tube-shaped ectotympanic, found in living catarrhines.
• This anatomical feature represents an intermediate stage between what is found in platyrrhines, which do not have an ossified ectotympanic tube, and catarrhines, which have a completely ossified ectotympanic tube.
• These bones form the middle ear in later mammal groups (see Evolution of mammalian auditory ossicles); they include the incus (quadrate), malleus (articular), ectotympanic (angular) and prearticular.

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