WebJan 21, 2014 · The genus Squalicorax evolved through several "species" during the deposition of the chalk in the Western Interior Seaway, approx. 87-82 million years ago. … WebTo my knowledge the longest range among selachian species seems to be Pseuhypolophus macnultyii, ranging from Upper Barremian to Santonian (some 27 M.Y.) but in my view this may be a missidentification due to the very simple morphology of these teeth and lack of determinative characters at species level.
ELASMO.COM - Selachian Topics - Rick Martin
WebDynamics of Selachian (Shark) Dental Morphology During the Early Mesozoic . Alexander Paxinos. The ancestors of all modern day sharks and rays (Neoselachii) may have … WebSekolah, The Great Shark. Your pact is with the Shark-Father Sekolah, an evil god that resides in Stygia, the fifth layer of the Nine Hells. Sekolah is known for being the greatest tyrant of the sea, taking pleasure in the hunt, plunder, and inevitable slaughter of his leviathan prey, or any other creature he deems worthy. ordained minister titles
Dusky shark - Wikipedia
Webselachian ( sɪˈleɪkɪən) adj (Animals) of, relating to, or belonging to the Selachii (or Elasmobranchii ), a large subclass of cartilaginous fishes including the sharks, rays, … 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 … See more 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 … See more Teeth Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly … See more Buoyancy Unlike bony fish, sharks do not have gas-filled swim bladders for buoyancy. Instead, sharks rely on a … See more 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 … See more Fossil record The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during the Early Silurian, around 439 million years … See more Smell Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between … See more The classic view describes a solitary hunter, ranging the oceans in search of food. However, this applies to only a few species. Most live … See more Webshark (shärk) n. 1. Any of numerous cartilaginous fishes of the subclass Elasmobranchii that are chiefly carnivorous and marine. Sharks have a streamlined torpedolike body, five to seven gill openings on each side of the head, a large oil-filled liver, and tough skin covered with small toothlike scales. 2. Informal A person, such as a loan shark, who ... ordained minister taxes