Life Cycles of Two Aphelocheirus Species (Hemiptera: Aphelocheiridae) in Kinki District, with Notes on Their Developments and Habitats

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  • ISHIDA Naoto
    Laboratory of Applied Entomology, Graduate School of Agriculture, Kyoto Prefectural University:(Present office)Western Kyoto Agricultural Councelling Office
  • YOSHIYASU Yutaka
    Laboratory of Applied Entomology, Graduate School of Agriculture, Kyoto Prefectural University

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  • 近畿地方におけるナベブタムシ属2種(半翅目:ナベブタムシ科)の生活環ならびにそれらの発育と生息環境
  • キンキ チホウ ニ オケル ナベブタムシゾク 2シュ ハンシモク ナベブタムシカ ノ セイカツカン ナラビニ ソレラ ノ ハツイク ト セイソク カンキョウ

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Abstract

Life cycles of two aphelocheirid species, Aphelocheirus vittatus and A. nawae, were investigated in Kinki district, Honshu, Japan, from 1996 to 1999. Aphelocheirus vittatus, widely distributed in Kinki district, is estimated to be univoltine in middle reaches of the Kamo River, Kyoto Prefecture, but in upper reaches of the river it may take two years to complete its life cycle. Aphelocheirus nawae, only known currently from the Muko River, Hyogo Prefecture, in Kinki district, is also revealed to have a one-year life cycle in middle reaches of the river. The adults of these 2 species are estimated to live for at least one year and females lay eggs from spring to early autumn. Based on the laboratory rearing, the effective cumulative temperature was 1,789 degree-days(dd) (developmental zero: 10.2℃) for development from oviposition to adult emergence in A. vittatus, and 2,000dd (8.2℃) in A. nawae, respectively. These two species inhabited fast flowing and oxygen-rich waters of pH 7-10. They were also observed to live on a sandy river bed scattered with gravels (cobbles), and partly with some submerged plants which may provide shelters or habitats for benthic invertebrates possively preyed on by these bugs.

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