
chilkaasettas

peruvinte aadyakaala mayoseen (akvittaaniyan) muthal ariyappedunna aadima audontosettinte vamshanasham sambhavicha oru janussaanu chilkaasettas. pisco thadatthinte chilkaatte roopeekaranathinte peril fossilukal kandethukayum avaykku peru nalkukayum cheythu.
vargeekaranam.
"urinodelphinidukal", "argrosettas", "macrodelphinus" ennivaykkoppam "yooplataanista", "urinodelphinidae" ennee claidukalil "chilkaasettas" veendedukkunnu. eee groupinginu kooduthal klaadistik vishakalana pinthuna nalkunnathinu "aargirosettas", "macrodelphinus" ennivayude update cheytha austiological vivaranagal aavasyamaanennu rachayithakkal oonnipparanju.
vivaranam.
chilkaasettas" nte pallukal homodond swabhaavamullathum rostrum neelamullathumaanu. asthikalude pinvashatthe mathilil naasalukalum mesethmoid thammilulla oru arayude saannidhyam eee taxonine mattu purathana audontosettukalil ninnu verthirikkunnu, athinaal eee inathinu "cavirhinus" ennu peru. naasalinte dorsal uparithalam anterodorasaly uyarnnuvarunnu, rostraminte vipulamaaya edentulus antrior premaxilary bhaagavum veethiyinekkaal cheruth "chilkaasettas" yeei "aargirosettas", "macrodelphinus" ennivayumaayi samyojippichu urinodelphinidukal ulppede matellaa homodond audontosettukaleyum ozhivaakkunnu.

