Heterochronic Expression of Several Adult Phenotypes in Normally Metamorphosing and Metamorphosis-Arrested Larvae of a Salamander Hynobius retardatus

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Heterochronic expressions of several larval and adult phenotypes in Hynobius retardatus, which had been reported to show neotenic reproduction, were described in normally metamorphosing animals (controls) and goitrogen-induced, metamorphosis-arrested larvae. External gills, dorsal tailfins and Leydig's cells in the epidermis were completely diminished in the controls during and after metamorphosis, but fully remained in the metamorphosis-arrested larvae. Two types of dermal glands, mucous and serous glands, however, behaved differently from Leydig's cells, even though they constituted the same skin. The dermal gland cells in the controls appeared at a premetamorphic stage, gradually increased in number during the metamorphosis and fully developed after the metamorphosis. Those in metamorphosis-arrested larvae appeared much later than in the controls. Thus, aged, metamorphosis-arrested larvae had skin which consisted of larval type epidermis (Leydig's cells) and adult type dermis (mucous and serous glands). Contrary to these, a transition of globin subunits from larval to adult types occurred practically on the same time schedule in both the controls and metamorphosis-arrested larvae. These observations suggest that there are at least three types of organs or cells which behave differently during and after metamorphosis in Hynobius retardatus.
社団法人日本動物学会の論文
1996-06-15