WebJan 4, 2024 · The First Whales . In most ways, Pakicetus (Greek for "Pakistan whale") was indistinguishable from other small mammals of the early Eocene epoch: about 50 pounds or so, with long, dog-like legs, a long tail, and a narrow snout. Crucially, though, the anatomy of this mammal's inner ears closely matches that of modern whales, the main "diagnostic" … WebMar 13, 2014 · Fish-shaped, as used in the paper, means a streamlined body and a obvious caudal fin (the back one that propels the organism). Here I would like to point out …
Evolution of cetaceans - Wikipedia
WebCetaceans are bent dorso-laterally in womb and this creates characteristic FETAL FOLDS that remain on the sides of the animal for several weeks to months after birth, fading as … Webdifferent from the cetaceans that live today. The exact ancestor of cetaceans is still unknown, but recent fossil findings indicate that one of the earliest cetaceans is an animal called a pakicetid. Pakicetids lived on land and resembled a short-legged wolf with hoof-like claws. It walked on four legs and was a meat eater. Some pakicetids may sims 4 power rangers cc
Ichthyosaurs - Earth History
WebThe peduncle is the large muscular area between the dorsal fin and the flukes. The caudal peduncle is the part where the flukes meet the body. There aren’t any bones or cartilage in the dorsal fin and flukes. Instead, they’re made up of dense connective tissue. Longitudinal muscles in the back and caudal peduncle move the flukes up and down. WebThe pectoral fin (evolution of the front limbs) and dorsal fin direct and stabilise the animal whilst the tail (caudal fin) is used for propulsion. One of the most recognisable features … WebCetaceans. STUDY. PLAY. Cetartiodactyla Balaenopteridae Balaenoptera musculus - blue whale - Gulper, feeds on krill and other pelagic crustaceans ... - Numerous throat groves (50-90) - Dorsal fin falcate to triangular, small on last 3rd of dorsal surface - Rostrum large and flat. Cetartiodactyla Balaenopteridae Megaptera novaeangliae - humpback ... r.c. farms llc