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The World's 100 most threatened species [1] is a compilation of the most threatened animals, plants, and fungi in the world. It was the result of a collaboration between over 8,000 scientists from the International Union for Conservation of Nature Species Survival Commission (IUCN SSC), along with the Zoological Society of London . [ 2 ]
The vaquita (/ v ə ˈ k iː t ə / və-KEE-tə; Phocoena sinus) is a species of porpoise endemic to the northern end of the Gulf of California in Baja California, Mexico.Reaching a maximum body length of 150 cm (4.9 ft) (females) or 140 cm (4.6 ft) (males), it is the smallest of all living cetaceans.
Most recent remains at the Naigani Lapita culture site dated to 950 BCE. [13] Flightless and totally terrestrial, it would have been quickly exterminated by humans and introduced mammals. [14] Sylviornis neocaledoniae: Grande Terre and Isle of Pines, New Caledonia Most recent remains at the Pindai Caves dated to 1120-840 BCE. [15]
This list currently includes only fossil genera and species. However, the Atlantic population of gray whales (Eschrichtius robustus) became extinct in the 18th century, and the baiji (or Chinese river dolphin, Lipotes vexillifer) was declared "functionally extinct" after an expedition in late 2006 failed to find any in the Yangtze River.
Aipysurus eydouxii (Spine-tailed sea snake) Aipysurus laevis (Olive sea snake) Astrotia stokesii (Stoke's sea snake) Disteira; Disteira major (Olive-headed or greater sea snake) Disteira nigrocincta Disteira walli (Wall's sea snake) Enhydrina schistosa (Beaked sea snake, hook-nosed sea snake, common sea snake, Valakadyn sea snake)
The description of Eurypterus fischeri by Gerhard Holm in 1896 was so elaborate that the species became one of the most completely known of all extinct animals, so much so that the knowledge of E. fischeri was comparable with the knowledge of its modern relatives (such as the Atlantic horseshoe crab).
Most marine reptile groups became extinct at the end of the Cretaceous period, but some still existed during the Cenozoic, most importantly the sea turtles. Other Cenozoic marine reptiles included the bothremydids , [ 4 ] palaeophiid snakes, a few choristoderes such as Simoedosaurus and dyrosaurid crocodylomorphs.
Marine mammals comprise over 130 living and recently extinct species in three taxonomic orders. The Society for Marine Mammalogy, an international scientific society, maintains a list of valid species and subspecies, most recently updated in October 2015. [1] This list follows the Society's taxonomy regarding and subspecies.