Observations on the internal asymmetry of the sternal artery and the cheliped asymmetry in selected decapod crustaceans

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Other Title
  • 十脚甲殻類における体内の不相称と鉗の不相称に関する研究
  • 十脚甲殻類における体内の不相称と鉗の不相称に関する研究〔英文〕
  • ジュッキャク コウカクルイ ニ オケル タイナイ ノ フ ソウショウ ト ハサ

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As a measure of internal asymmetry, laterality of the sternal artery was studied in selected species of penaeoideans, carideans, astacideans, thalassinideans, anomurans and brachyurans. Special attention was paid to a possible relationship to the asymmetry of the chelipeds. Studies showed that laterality of the artery is not related to that of the major cheliped. In penaeoideans, carideans, thalassinideans and brachyurans, an almost even variation in left and right arteries was observed, whereas hermit crabs carrying gastropod shells exclusively possessed a left-sided sternal artery. The left-sided sternal artery was also found in the Lithodidae, but not in the Pomatochelidae. The tendency for a left-sided sternal artery was observed in the Astacidae, while the reversed tendency was found in the Porcellanidae.

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