The development of squamation in four teleostean fishes with a survey of the literature

The development of squamation is described in four teleost species,Cichlasoma octofasciatum (Cichlidae),Poecilia reticulata (Poeciliidae),Barbus barbus (Cyprinidae) andCorydoras arcuatus (Callichthyidae). These observations are compared to previous descriptions of the squamation development in other species (mainly teleosts) known from the literature. Among teleosts, 7 different regions can be delimited on the body, each containing the sites of the first scale appearance. Some species have only one site (generally located on the caudal peduncle) whereas others have two or more. The possibility of the involvement of epigenetic factors to explain the existence of several sites of scale appearance and their localization on the body surface is discussed.

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