The Fine Structure of the Early Pelvic Fin Bud of the TroutsSalmo gairdneriandS. trutta fario

Abstract

Ge'raudie, J . 1978. The fine structure of the early pelvic fin bud of the trouts Salmo gairdneri and S . trutta /aria. (Laboratoire d'Anatomie Comparte, Universitt Paris VII, France.) -Acta zool. (Stockh.) 59( 2) : 85-96.The three components of the developing pelvic fin bud of the trout Salmo, namely the epidermis, the mesenchyme and the epidermal-niesenchymal interface have been studied with the electron microscope. The results suggest that the columnar cells of the pseudoapical ridge which forins a fold, could contribute to the initiation of the first actinotrichial deposits. We also report the alterations of the e,pidermal-inesenchytnal interface, most obvious in the subepidermal space of the prominent pendoapical ridge. We finally describe the features o f both kind of mesenchyme. In each case, the present data are discussed against the background of the developing tetrapod limb bud literature.

Fine structural comparative peculiarities of the developing dipnoan dermal skeleton in the fins of Neoceratodus larvae

“…Plesiomorphic Character of the Actinotrichia in the Osteichthyans Fish The actinotrichia found in Neoceratodus larvae exhibit the typical regular cross-striation found in other fish lineages such as Sarcopterygii Coelacanthidae (Geraudie and Meunier, 19801, Actinopterygii [teleosts: Fitton-Jackson (1968), Nadol et al (19691, Kemp and Park (1970), Bouvet (1974), Geraudie (1977, 1978, 19821, and Geraudie and Meunier (198211 and in the Elasmobranch (Mc-Gavin and Pyper, 1964Kemp, 1977). In Elasmobranch the ceratotrichia, the only dermal fin skeleton of the fins, are considered so far to be homologous to the actinotrichia (Bouvet, 1974;Kemp, 1977).…”

Limb Evolution: Fish fins or tetrapod limbs — a simple twist of fate?

“…lb). By comparison with limbs, fin bud outgrowth ceases earlier; mesenchymal proliferation finishes as the apical fin bud ectoderm transforms into a protruding fold, enclosing the developing dermal rays [5]. In the pectoral fin, proximo-distal subdivision of the mesoderm forms a series of four proximal radials, while peripheral foci form distal radials (Fig.…”