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Shark. † Synechodontiformes. 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).
Fort Lauderdale, Florida: As a symbol of the city's nickname "The Venice of America", an anchor is dropped. Key West (Sloppy Joe's Bar): The Key West Conch Drop, where a six-foot Queen Conch Shell drops 6 meters (20 feet) to the top of the bar to usher in the New Year, is held annually for the island's official New Year celebrations.
1. General characteristics. Type. Autonomous underwater vehicle. Notes. Information on the design has not been publicly released. [1] The Ghost Shark is an autonomous underwater vehicle that is being jointly developed by Anduril Industries and the Department of Defence for the Royal Australian Navy. Three prototypes have been ordered.
The frilled shark ( Chlamydoselachus anguineus ), also known as the lizard shark, is one of the two extant species of shark in the family Chlamydoselachidae (the other is the southern African frilled shark ( Chlamydoselachus africana )). The frilled shark is considered a living fossil, because of its primitive, anguilliform (eel-like) physical ...
The Greenland shark ( Somniosus microcephalus ), also known as the gurry shark or grey shark, is a large shark of the family Somniosidae ("sleeper sharks"), closely related to the Pacific and southern sleeper sharks. [2] Inhabiting the North Atlantic and Arctic Oceans, they are notable for their exceptional longevity, although they are poorly ...
The first shark-like chondrichthyans appeared in the oceans 400 million years ago, developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark.
The blacktip shark ( Carcharhinus limbatus) is a species of requiem shark, and part of the family Carcharhinidae. It is common to coastal tropical and subtropical waters around the world, including brackish habitats. Genetic analyses have revealed substantial variation within this species, with populations from the western Atlantic Ocean ...
Carcharodon albimors Whitley, 1939. The great white shark ( Carcharodon carcharias ), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. It is the only known surviving species of its genus Carcharodon.