The hammerhead sharks are a group of sharks that form the family Sphyrnidae, named for the unusual and distinctive form of their heads, which are flattened and laterally extended into a cephalofoil. The shark's eyes are placed one on either end of this T-shaped structure, with their small mouths directly centered and underneath. Most hammerhead species are placed in the genus Sphyrna, while the winghead shark is placed in its own genus, Eusphyra. Many different— but not necessarily mutually exclusive—functions have been postulated for the cephalofoil, including sensory reception, manoeuvering, and prey manipulation. The cephalofoil gives the shark superior binocular vision and depth perception.
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 and are the sister group to the Batoidea. Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as Cladoselache and Doliodus first appeared in the Devonian Period, though some fossilized chondrichthyan-like scales are as old as the Late Ordovician. The oldest confirmed modern sharks (selachimorphs) are known from the Early Jurassic, about 200 million years ago, though records of true sharks may extend back as far as the Permian.
The San Jose Sharks are a professional ice hockey team based in San Jose, California. The Sharks compete in the National Hockey League (NHL) as a member of the Pacific Division in the Western Conference, and are owned by San Jose Sports & Entertainment Enterprises. Beginning play in the 1991–92 season, the team initially played its home games at the Cow Palace, before moving to its present home, now named SAP Center at San Jose, in 1993; the SAP Center is known locally as "the Shark Tank". The Sharks are affiliated with the San Jose Barracuda of the American Hockey League (AHL) and the Wichita Thunder of the ECHL.
The whale shark is a slow-moving, filter-feeding carpet shark and the largest known extant fish species. The largest confirmed individual had a length of 18.8 m (61.7 ft). The whale shark holds many records for size in the animal kingdom, most notably being by far the most massive living non-cetacean animal. It is the sole member of the genus Rhincodon and the only extant member of the family Rhincodontidae, which belongs to the subclass Elasmobranchii in the class Chondrichthyes. Before 1984 it was classified as Rhiniodon into Rhinodontidae.
Helicoprion is an extinct genus of shark-like eugeneodont fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls", which in life were embedded in the lower jaw. As with most extinct cartilaginous fish, the skeleton is mostly unknown. Fossils of Helicoprion are known from a 20 million year timespan during the Permian period from the Artinskian stage of the Cisuralian to the Roadian stage of the Guadalupian. The closest living relatives of Helicoprion are the chimaeras, though their relationship is very distant. The unusual tooth arrangement is thought to have been an adaption for feeding on soft bodied prey, and may have functioned as a deshelling mechanism for hard bodied cephalopods such as nautiloids and ammonoids. In 2013, systematic revision of Helicoprion via morphometric analysis of the tooth whorls found only H. davisii, H. bessonowi and H. ergassaminon to be valid, with some of the larger tooth whorls being outliers.
Shark Week is an annual, week long TV programming block at the Discovery Channel, which features shark-based programming. Shark Week originally premiered on July 17, 1988. Featured annually, in July or early August, it was originally devoted to conservation efforts and correcting misconceptions about sharks. Over time, it grew in popularity and became a hit on the Discovery Channel. Since 2010, it has been the longest-running cable television programming event in history. Broadcast in over 72 countries, Shark Week is promoted heavily via social networks like Facebook and Twitter. Episodes are also available for purchase on services like Google Play Movies & TV/YouTube, Amazon Video, and iTunes. Some episodes are free on subscription-based Hulu and Discovery+.
Edestus is an extinct genus of eugeneodontid holocephalian fish known from the Late Carboniferous (Pennsylvanian) of the United Kingdom, Russia, and the United States. Most remains consist of isolated curved blades or "whorls" that are studded with teeth, that in life were situated within the jaws. Edestus is a Greek name derived from the word edeste, in reference to the aberrant quality and size of the species' teeth. The largest species, E. heinrichi, has been conservatively estimated to reach greater than 6.7 m (22 ft) in length, around the size of the largest known great white shark, possibly making it the largest marine predator to have ever existed up to that point.
Orodus is an extinct genus of cartilaginous fish that lived from the late Pennsylvanian to the early Permian in what is now North America. O. greggi reached around 2–4 metres (6.6–13.1 ft) long, while O. micropterygius just reached 1 metre (3.3 ft). It was a member of the holocephali subclass, meaning that it was more closely related to chimaeras and their relatives, and not elasmobranchs like sharks and rays.
Campodus is an extinct genus of eugeneodont holocephalans from the Carboniferous. Likely one of the earliest and most basal caseodontoids, it can be characterized by its broad, ridge-ornamented crushing teeth made of various types of dentine. The type species, C. agassizianus, was originally described in 1844 based on a small number of teeth from the Namurian of Belgium.
Caseodus is an extinct genus of eugeneodontid holocephalian from the Carboniferous of the United States and the Early Triassic of Canada. It was of medium size, measuring 1–1.5 m (3.3–4.9 ft) in length.
Parahelicoprion is an extinct genus of shark-like eugeneodontid holocephalids from the Permian of the Ural Mountains (Russia) and Copacabana Formation, Bolivia. The genus name, from "nearly coiled saw" in Greek, directly refers to Helicoprion, a related holocephalid that shares similar traits to it, including the helical whorl of teeth.
The Eugeneodontida, sometimes also called Eugeneodontiformes, is an extinct and poorly known order of cartilaginous fishes. They possessed "tooth-whorls" on the symphysis of either the lower or both jaws and pectoral fins supported by long radials. They probably lacked pelvic fins and anal fins. The palatoquadrate was either fused to the skull or reduced. Now determined to be within the Holocephali, their closest living relatives are ratfish. The eugeneodonts are named after paleontologist Eugene S. Richardson, Jr. The Eugeneodontida disappeared in the Early Triassic. The geologically youngest fossils of the group are known from the Sulphur Mountain Formation, Vardebukta Formation and Wordie Creek Formation (Greenland).
Shark Tank is an American business reality television series that premiered on August 9, 2009, on ABC. The show is the American franchise of the international format Dragons' Den, a Japanese TV series. It shows entrepreneurs making business presentations to a panel of five venture capitalists called "sharks" on the program, who decide whether to invest in their companies.
Toxoprion is an extinct genus of eugeneodont holocephalids whose fossils are found in marine strata from the Early Carboniferous until the Late Permian near Eureka, Nevada.
Plated was an American ingredient-and-recipe meal kit service that has been acquired by Albertsons. The company was founded in 2012 and became well known through its participation in Techstars in 2013, Shark Tank in 2014 and Beyond the Tank in 2015. Plated's founders, Nick Taranto and Josh Hix, earned a deal on Shark Tank that fell through, but negotiated a deal with a different Shark Tank investor after the show was filmed. The company accepted several rounds of venture capital investments and remained private until it was acquired by Albertsons in September 2017.
Agassizodus is an extinct genus of eugeneodont holocephalian from the Carboniferous. It belongs to the family Helicoprionidae, which is sometimes called Agassizodontidae. Like other members of its family, it possessed a symphyseal tooth whorl, which was likely present at the tip of the lower jaw and associated with lateral crushing toothplates. The type species, A. variabilis, was originally named Lophodus variabilis until the name "Lophodus" was determined to be preoccupied.
"Baby Shark" is a children's song associated with a dance involving hand movements dating back to the late 20th century. In 2016, "Baby Shark" became very popular when Pinkfong, a South Korean entertainment company, released a version of the song on June 17, 2016, with a YouTube music video which went viral in social media, online video, and radio. In January 2022, it became the first YouTube video to reach 10 billion views. In November 2020, Pinkfong's version became the most-viewed YouTube video of all time, with over 14 billion views as of March 2024.
The 2020 Notre Dame Fighting Irish football team represented the University of Notre Dame in the 2020 NCAA Division I FBS football season. The team was led by Brian Kelly in his 11th season at Notre Dame. The Fighting Irish played their home games at Notre Dame Stadium in Notre Dame, Indiana.
The 2020 Cronulla-Sutherland Sharks season was the 54th in the club's history. The team was coached by John Morris and captained by Wade Graham. The team competed in the National Rugby League's 2020 Telstra Premiership. This season marked the first since 2001 without club legend Paul Gallen, who retired at the end of the 2019 season.
Dracopristis is an extinct genus of ctenacanth that lived around 307 million years ago, during the Pennsylvanian sub-period of the Carboniferous period. The fish had 12 rows of short, squat teeth, and an array of spines on its dorsal fins. The main differentiation between ctenacanthiformes and true sharks is that ctenacanthiform mouths are larger but less flexible than the true sharks. The spines of the holotype fossil are about 0.57 meters long, and the whole body was around 2 meters (6 ft) long.
