WebbThe megalodon was the world's largest fish. An apex predator, it may have been the largest marine predator that has ever lived. Some assert that megalodon and modern white sharks evolved within the same lineage (Lamnidae), while others classify megalodon within the lineage of megatooth sharks (Otodontidae). Webb2 aug. 2024 · This family of sharks is an ancient lineage some 125 million years old, which evolved during the early cretaceous period and would have coinhabited the earth with dinosaurs.
NATIONAL MEGALODON DAY - June 15, 2024 - National Today
Webb15 nov. 2024 · Tiger sharks (Galeocerdo), which represent apex predators in modern oceans, have a known fossil record extending back into the early Eocene (ca. 56 Ma) and … Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea (rays and kin). Some … Visa mer Until the 16th century, sharks were known to mariners as "sea dogs". This is still evidential in several species termed "dogfish," or the porbeagle. The etymology of the word shark is uncertain, the most … Visa mer Teeth Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly … Visa mer Buoyancy Unlike bony fish, sharks do not have gas-filled swim bladders for buoyancy. Instead, sharks rely on a large liver filled with oil that contains squalene, and their cartilage, which is about half the normal density of bone. Their liver … Visa mer The classic view describes a solitary hunter, ranging the oceans in search of food. However, this applies to only a few species. Most live far more social, sedentary, benthic lives, and appear likely to have their own distinct personalities. Even solitary sharks … Visa mer Fossil record The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during the … Visa mer Smell Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between … Visa mer Shark lifespans vary by species. Most live 20 to 30 years. The spiny dogfish has one of the longest lifespans at more than 100 years. Whale sharks (Rhincodon typus) may also live over 100 years. Earlier estimates suggested the Greenland shark (Somniosus microcephalus) … Visa mer inconsistent group protocol
Shark evolution Fossil Wiki Fandom
Webb7 dec. 2024 · Tiger sharks (Galeocerdo), which represent apex predators in modern oceans, have a known fossil record extending back into the early Eocene (ca. 56 Ma) and … WebbLamniformes, also known as mackerel sharks, are a diverse order of sharks. Members of this order have two dorsal fins, an anal fin, five gill slits, and a mouth that extends past … Webb1 nov. 2024 · Tiger sharks ( Galeocerdo ), which represent apex predators in modern oceans, have a known fossil record extending back into the early Eocene (ca. 56 Ma) and comprise 22 recognized extinct and one extant species to date. inconsistent growth