
merideolestida

thekke amerikkayile cretatius, senosoic, orupakshe antartikka ennividangalil ninnu ariyappedunna vamshanasham sambhavicha sasthanikalude oru vamshamaan merideolestida. cretatius kaalaghattatthinte avasaanathil thekke amerikkayile pradhana sasthanikalude groupine avaa prathinidheekarichu. merideolestidan roopashaasthraparamaayi vaividhyamaarnnathaayirunnu, "sabrettooth-skviral" chronopio "polulla cheria praanikale bhakshikkunnavayum athupole thanne mesungulattomorpha cled mesungulattoidiya/mesungulattomorphayum adangiyirunnu, avaa shroo-sised" regitherium "muthal naaya valippamulla" peligrotherium "vare valippathil undaayirunnu."messengulatoidiensin bunodond (thaazhnnathum vrithaakruthiyilullathumaaya) pallukal upayogichu valare parishkaricha pallukal undaayirunnu, avaa sasyabhukkukalo sarvvabhakshikalo aayirikkam.
merideolestidaanukale saadhaaranayaayi claudotheriaykkullil tharamthirickunnu, monotramukalekkaal jeevichirikkunna marsupiyalukalumaayum plaasantal sasthanikalumaayum (theria) kooduthal adutha bandhamund, oru patanam avare spalacotherid "cemetrodondukal" ennathinulla sahodari taxayai veendedukkunnu. ennirunnaalum, sameepakaala padanangal claudothian vyaakhyaanathil urachunilkkunnu. claudotheriaykkullil, vadakkan ardhagolathile jurassic, aadyakaala cretatius kaalaghattatthil ariyappedunna sasthanikalude oru koottamaaya dryolestidaykkom dryolestoidia enna groupilaanu avaye palappozhum sthaapichittullathu. ennirunnaalum, chila vishakalanangal eee groupine paraphyletic aanennu kandethiyittundu, mattu driolestidaanukale apekshichu merideolestidaanukal therian sasthanikalumayi erekkure adutha bandhamullavayaan. molarifom pallukalil paaraastilaar hukkinte abhaavathilum mccallion groovinte abhaavathilum merideolestidance vadakkan driolestoidukalil ninnu vyathyasthamaayirunnu.
"vadakke amerikkayile aadyakaala kreetteshyasil ninnulla "lacotalestus", yadhaarthathil oru dryolestid ennu thiricharinjirunnu, merideolestidansumaayi aduthulla oru pallu roopaghadana oru pepparil rekhappeduthiyittundu. antartic upadveepinte eoseenil ninnulla laa mesetta roopeekaranathil kaanapedunna ippol nashtappetta oru pallu shakalathil ninnu oru saadhyathayulla merideolestadan ariyappedunnu. paattagoniyayile mayoseenil ninnulla moll polulla kuzhal keedabhakshiyaaya "necrolestes" aayirunnu athijeevichirikkunna ettavum puthiya merideolestidan.