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Its long and narrow tail was deepened by tall, thin neural spines and elongated chevrons, forming a flexible fin or paddle-like structure. Spinosaurus is known to have eaten fish and small to medium terrestrial prey as well. [5] Evidence suggests that it was semiaquatic; how capable it was of swimming has been strongly contested.
The gharial is the most extreme example and a fish specialist; Australian freshwater crocodiles, which have similarly shaped skulls to gharials, also specialize more on fish than sympatric, broad snouted crocodiles and are opportunistic feeders which eat all manner of small aquatic prey, including insects and crustaceans. Thus, spinosaurids ...
An isolated fish vertebra, tentatively referred to Onchopristis, has been associated with the tooth alveolus of a possible specimen of Spinosaurus (MSNM V 4047). [27] Similarly, the dentary fragment of Spinosaurus aegyptiacus (MPDM 31) is associated with the rostral denticle of Onchopristis. [28]
They share membership in this clade with lungfish and tetrapods. Externally, several characteristics distinguish coelacanths from other lobe-finned fish. They possess a three-lobed caudal fin, also called a trilobate fin or a diphycercal tail. A secondary tail extending past the primary tail separates the upper and lower halves of the coelacanth.
Oxalaia (in reference to the African deity Oxalá) is a controversial genus of spinosaurid dinosaur that lived in what is now the Northeast Region of Brazil during the Cenomanian stage of the Late Cretaceous period, sometime between 100.5 and 93.9 million years ago.
A similar, though more extreme, shrinkage of the pelvic girdle and elongation of the tail's neural spines, creating a paddle-like structure, was observed in Spinosaurus, which appears to have been more aquatic than any other known non-avian (or non-bird) dinosaur. [26]
A recent study in the Journal of Great Lakes Research shed light on the growing problem of goldfish proliferating outside of the proverbial fish bowl. A real fish tail. Giant goldfish swimming in ...
Other features of "Spinosaurus B" also differed from Carcharodontosaurus, lending support to the notion that it (and therefore Sigilmassasaurus) is a separate taxon. The same study claimed that the tail vertebrae by Russell assigned to the species were in fact those of iguanodonts. [13]