Scale microstructure and its phylogenetic implications in lycaenid butterflies (Lepidoptera, Lycaenidae)

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  • シジミチョウ科の鱗粉の微細構造と系統発生学的意味合い

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Abstract

The structural scales that give rise to the characteristically vivid green, blue or violet iridescent colours of some 47 species of Lycaenidae and 7 species of Riodinidae have been examined by optical and scanning electron microscopy. Most species of Lycaenidae examined produce iridescent colours via a multilayer elaboration within the lumen of the scale into a Urania-type microstructure. The multilayers were found to be perforated and possess a characteristically complex and typical microstructure, referred to as a pepper-pot structure. In addition, colour production by a Morpho-type structure was unexpectedly found in some species of the subfamily Lycaeninae. This microstructure results from an elaboration of flutes on the ridges and is quite distinct from Morpho-type scales found in the Riodinidae, which are derived from scutes. The phylogenetic and taxonomic usefulness of scale microstructure is considered and it is speculated that within Lycaeninae Morpho-type scales may have evolved by transition from Urania-type scales.

Journal

  • Lepidoptera Science

    Lepidoptera Science 53 (3), 153-180, 2002

    THE LEPIDOPTEROLOGICAL SOCIETY OF JAPAN

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