Osteichthyes are primitively ectothermic ( cold blooded ), meaning that their body temperature is dependent on that of the water.
12.
Bony fish ( Osteichthyes ) vastly outnumber cartilaginous fish ( Chondrichthyes ) in terms of both number of species and biomass.
13.
The modern bony fishes, class Osteichthyes, appeared in the late Silurian or early Devonian, about 416 million years ago.
14.
Early cartilaginous ( Chondrichthyes ) and bony fishes ( Osteichthyes ) also become diverse and played a large role within the Devonian seas.
15.
"Osteichthyes " in the paleontological sense ( i . e ., " bony vertebrates " ), is synonymous with Euteleostomi.
16.
Recent studies indicate that Osteichthyes evolved from placoderms like " Entelognathus ", while acanthodians are more closely related to modern chondrichthyes.
17.
However, in ichthyology and Linnaean taxonomy Osteichthyes, literally " bony fish, " refers to the paraphyletic group that differs by excluding tetrapods.
18.
Fleshy lobe-fins supported on bones rather than ray-stiffened fins seem to have been an ancestral trait of all bony fishes ( Osteichthyes ).
19.
Finfish ( class Osteichthyes ) have three pairs of otoliths the sagittae ( singular sagitta ), lapilli ( singular lapillus ), and asterisci ( singular asteriscus ).
20.
The skeleton, which forms the support structure inside the fish is either made of cartilage as in the ( Chondrichthyes ), or bones as in the ( Osteichthyes ).
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