ミツクリヒゲナガハナバチとニッポンヒゲナガハナバチの刷毛の比較研究

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  • Comparisons of Scopal Hairs between Tetralonia mitsukurii and Tetralonia nipponensis (Hymenoptera: Apidae)
  • ミツクリヒゲナガハナバチ ト ニッポンヒゲナガハナバチ ノ ハケ ノ ヒカク ケンキュウ

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In order to reconfirm flower visiting habits and examine the reciprocal relationship between the habits and the morphologies of scopal hairs on two Tetralonia species, T. mitsukurii and T. nipponensis (Hymenoptera: Apidae), morphological comparisons were conducted in two species by light microscope and scanning electron microscope (SEM). The material used were collected at Setaura, in Mt. Aso, Kumamoto Pref., Japan. Tetralonia nipponensis was reconfirmed to be a polyphagous and polylectic species because it visited many flower species with pollens of various species attached over the scopal hairs. All samples of T. mitsukurii had only a certain pollen species in middle to high rank of minutae (diameter: 16.5–23.0μm). The pollen grains were identified as Lespedeza bicolor from the morphological characteristics, and T. mitsukurii was considered as an oligolectic species. The scopal hairs of T. mitsukurii were shorter, thinner, closer and had more branched hairs than those of T. nipponensis. Most Japanese species in Eucerini visit various flowers with their polyphagies in the short term of spring. Tetralonia mitsukurii may have changed its period of flower visiting activities to autumn, showed intensive visits to Lespedeza and specialized scopal hairs in proportion to the small pollen grains of the flowers.

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