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Hace 1 día · The Kuldana Formation is a fossil-bearing geological formation of Lutetian (Early Eocene) age which crops out in northern Pakistan.The abundant fossil remains were deposited by rivers and estuaries crossing an arid to semi-arid environment, between several marine transgressions.Its fossil fauna is best known for the early cetaceans Indohyus, Pakicetus and Ambulocetus, that helped to shed a new ...
Hace 1 día · Agnatha (/ ˈ æ ɡ n ə θ ə, æ ɡ ˈ n eɪ θ ə /; from Ancient Greek ἀ-(a-) 'without' and γνάθος (gnáthos) 'jaws') is an infraphylum of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct (conodonts, anaspids, and ostracoderms) species.Among recent animals, cyclostomes are sister to all vertebrates with jaws, known as ...
