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Isurus
''Isurus'' (meaning "equal tail") is a genus of mackerel sharks in the family Lamnidae, commonly known as the mako sharks. They are largely pelagic, and are fast, predatory fish capable of swimming at speeds of up to . Fossil history and evolution Although fossil teeth of ''Isurus'' have been reported from as early as the Late Cretaceous, they are likely to be of a shark with a similar dentition, '' Cretoxyrhina''; since at one point they were considered to be the same (now defunct) genus ''Oxyrhina'', and modern referrals to ''Isurus'' in the Cretaceous are scant. The earliest appearance of ''Isurus'' proper seems to be during the Oligocene with ''Isurus desori''. There has been much debate and speculation about the evolutionary origin and relationships between ''Isurus'' and its closest relatives, including the extant great white shark (''Carcharodon carcharias''). Molecular clock analyses place the last common ancestor of ''Isurus'' and '' Carcharodon'' between 43–60 mil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shortfin Mako Shark
The shortfin mako shark (; ; ''Isurus oxyrinchus''), also known as the shortfin mako, blue pointer, or bonito shark, is a large Lamniformes, mackerel shark. It is commonly referred to as the mako shark, as is the longfin mako shark (''Isurus paucus''). The fastest known shark species, able to reach speeds of in bursts, the shortfin mako can attain a size of in length and weigh . The species is classified as Endangered by the IUCN. Etymology "Mako" comes from the Māori language, meaning either the shark or a shark tooth. Following the Māori language, "mako" in English is both singular and plural. The word may have originated in a dialectal variation, as it is similar to the common words for shark in a number of Polynesian languages—''makō'' in the Ngāi Tahu, Kāi Tahu Māori dialect, ''mangō'' in other Māori dialects, ''mago'' in Samoan language, Samoan, ''ma'o'' in Tahitian language, Tahitian, and ''mano'' in Hawaiian language, Hawaiian. The first written usage is in S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
