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As Cretoxyrhina inhabited oligotrophic and pelagic waters where predators such as large mosasaurs like Tylosaurus and macropredatory fish like Xiphactinus were common, it is likely that it also was an r-selected shark, where many infants are produced to offset high infant mortality rates.
Xiphactinus (from Latin and Greek for "sword-ray") is an extinct genus of large predatory marine ray-finned fish that lived during the late Albian to the late Maastrichtian. [4] The genus grew up to 5–6 metres (16–20 ft) in length, and superficially resembled a gargantuan, fanged tarpon .
A 13-foot-long Xiphactinus containing, below the ribs, a 6-foot-long fish, a Gillicus, which took up about half of the length of the Xiphactinus, killing it instantly. North Dakota, 1995: Two amateur collectors go into a cave in North Dakota, and find a wealth of teeth from sharks, specifically Cretoxyrhina and Squalicorax.
Other marine life included sharks such as Squalicorax, Cretoxyrhina, and the giant durophagous Ptychodus mortoni (believed to be 10 metres (33 ft) long); [12] and advanced bony fish including Pachyrhizodus, [13] Enchodus, and the massive 4-to-5-metre (13 to 16 ft) long Xiphactinus, larger than any modern bony fish. [14]
†Cretoxyrhina †C. mantelli; Albian-Campanian 107.59–73.2 mya North America; Sweden Cretoxyrhina was one of the largest sharks of its time. It had convergently evolved similar appearance and build to the modern great white shark but it was only distantly related within Lamniformes.
†Xiphactinus australis (Woodward, 1894) Cooyoo ("fish" in the Yirandhali language ) is an extinct genus of ichthyodectid ray-finned fish known from the Lower Cretaceous . It contains a single species, C. australis , known from the Albian -aged Toolebuc and Allaru Formations of Queensland , Australia . [ 1 ]
†Cretoxyrhina Glikman, 1958 †Cretoxyrhina agassizensis Underwood & Cumbaa, 2010 †Cretoxyrhina mantelli Agassiz, 1843 †Cretoxyrhina vraconensis Zhelezko, 2000 †Cristabatis Delsate & Candoni, 2001 †Cristabatis crescentiformis Delsate & Candoni, 2001 †Cristabatis exundans Delsate & Candoni, 2001 †Cristatodens Ginter & Sun, 2007
Restoration of the Late Cretaceous shark Cretoxyrhina, or the Ginsu shark †Cretoxyrhina †Cretoxyrhina mantelli †Crocodilus †Crocodilus obscurus – type locality for species †Cronquistiflora †Cronquistiflora sayrevillensis; Ctena †Ctena parvilineata; Ctenoides †Ctenoides crenulicostata; Shell of a Cucullaea, or false ark shell ...