寄生性カイアシ類Acanthochondria eptatreti(ポエキロストマ目ツブムシ科）の血球の形態学的特徴および響灘産ヌタウナギEptatretus burgeriにおける寄生状況

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  • Morphological Characterization of Hemocytes of Parasitic Copepod Acanthochondria eptatreti(Poecilostomatoida: Chondracanthidae) and Infection of Acanthochondria eptatreti on Hagfish Eptatretus burgerifrom Hibiki-Nada
  • キセイセイカイアシルイ Acanthochondria eptatreti ポエキロストマモクツブムシカ ノ ケッキュウ ノ ケイタイガクテキトクチョウ オヨビ ヒビキナダサン ヌタウナギ Eptatretus burgeri ニオケル キセイジョウキョウ

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Morphological characteristics of hemocytes in parasitic copepod Acanthochondria eptatreti (Chondracanthidae, Poecilostomatoida) from hagfish Eptatretus burgeri off Shimonoseki (Hibiki-Nada), Japan, were histologically examined by light microscopy. Only a single type of hemocyte, basophilic granulocyte, was observed not only in the hemal space, but also on/in the connecting tissue of A. eptatreti. The morphology of the hemocytes, especially cytoplasmic granules, were similar to those of other parasitic copepods, Pseudocaligus fugu (Siphonostomatoida) and anchor worm Lernaea cyprinacea (Cyclopoida), hemocyte-like granular cells of the copepods with free life style (Tigriopus japonicus (Harpacticoida) and Cyclops vicinus (Cyclopoida)) in which lack circulating hemocytes. About 12% of hagfish were infected with A. eptatreti. This is the first recorded occurrence of A. eptatreti infection on hagfish in Japan.

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