ectotympanic sentence in Hindi
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- Most importantly, however, pliopithecoids had an incompletely ossified ectotympanic tube.
- In some small sperm whales, the malleus is fused with the ectotympanic.
- However, it had a bony ear tube ( ectotympanic ) and teeth comparable to those of living catarrhines.
- It was also characterised by a short face, a narrow gap between the eyes, a tubular ectotympanic and a relatively large brain.
- 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 ectoympanic tube.
- Catarrhines also never have prehensile tails, and have flat fingernails and toenails, a tubular ectotympanic ( ear bone ), and eight, not 12, premolars, giving them a dental formula of :.
- In other respects ( i . e ., presence of an aphaneric, or intrabullar, ectotympanic bone connected to the lateral bullar wall by an unbroken annular bridge ), omomyids are uniquely derived among primates.
- Modern cetaceans have internal, rudimentary hind limbs, such as reduced femurs, fibulas, and tibias, and a pelvic girdle . " Indohyus " has a thickened ectotympanic internal lip of the ear bone.
- These include the aforementioned four-toothed toothcomb, an inflated auditory bulla ( bony structure that encloses part of the middle and inner ear ), and an intrabullar ectotympanic ring ( bony ring that holds the eardrum ).
- Ranga Rao's widow gave the rocks to Professor Thewissen, who was working on them when his technician accidentally broke one of the skulls they had found and Thewissen recognised the ear structure of the auditory bulla, formed from the ectotympanic bone in a shape which is highly distinctive, found only in the skulls of cetaceans both living and extinct, including " Pakicetus ".
- Several anatomical features identifies " Carolinacetus " as a protocetid ( and therefore as a member of Pelagiceti ) including : external nares are located above the canine, the supraoccipital ( in cetaceans, the part of the occipital bone located above the foramen magnum and directed backwards ) is narrow and tubular, accessory cusps absent on M 3, a broad connection between the ectotympanic axis vertebra with large vertebral foramen.
- In odontocetes, the tympanic membrane ( or ligament ) has the shape of a folded-in umbrella that stretches from the ectotympanic ring and narrows off to the malleus ( quite unlike the flat, circular membrane found in land mammals . ) In mysticetes, it also forms a large protrusion ( known as the " glove finger " ), which stretches into the external meatus and the stapes are larger than in odontocetes.
- 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.
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