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Although fossil teeth of Isurus have been reported from as early as the Late Cretaceous, [6] [7] 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, [8] and modern referrals to Isurus in the Cretaceous are scant.
The Lamnidae are the family of mackerel sharks known as white sharks. [2] They are large, fast-swimming predatory fish found in oceans worldwide, though they prefer environments with colder water.
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Scientists believe that I. desori belongs to the subfamily Isuridae, where it evolved into the only two contemporary species, I. paucus and I. oxyrinchus, the only surviving species of the genus Isurus. It was once believed that I. desori belonged to the genus Oxyrhina, which is now considered a likely invalid or doubtful genus. [citation needed]
Ground sharks, like this blacknose shark, have a nictitating membrane which can be drawn over the eye to protect it.. Carcharhiniformes / k ɑːr k ə ˈ r aɪ n ɪ f ɔːr m iː z /, commonly known as ground sharks, are the largest order of sharks, with over 270 species.
The common name requiem shark may be related to the French word for shark, requin, which is itself of disputed etymology.One derivation of the latter is from Latin requiem ("rest"), which would thereby create a cyclic etymology (requiem-requin-requiem), but other sources derive it from the Old French verb reschignier ("to grimace while baring teeth").
Audubon's warbler (Setophaga auduboni) is a small bird of the family Parulidae.At one time considered a distinct species, discovery of a hybrid zone between it and the myrtle warbler in 1973 has led to it being classified as a subspecies of the yellow-rumped warbler.
Isozoanthus sulcatus is distinct from other species in its family Parazoanthidae.It is morphologically unique and in addition contains differences in the genetic sequences mitochondrial cytochrome oxidase subunit 1 and the nuclear internal transcribed spacer region (), both genetic markers used to classify Parazoanthidae.