Abstract
Since aquatic and land vertebrates live in different habitats,the morphology and function of bone might be greatly affected by the habitats of each vertebrate. We histologically investigated the bones of various vertebrates including teleost fishes, amphibians, reptiles, and mammals. Teleost fishes exhibited either bones contained many osteocytes (cellular bone) or bones have few osteocytes (acellular bone) . The development of osteocyte lacunocanalicular system in the cellular bone of the fish is poor compared to those in amphibians, reptiles, and mammals. Bones in Xenopus laevis, a freshwater species, exhibited well-developed lacunocanalicular systems as well as those in reptiles and mammals. These studies indicates that the osteocyte lacunocanalicular system differs between teleost fishes and land vertebrates, but this is not directly related to aquatic habitat.
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