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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Coitocaecum parvum ： ウィキペディア英語版 Coitocaecum parvum ''Coitocaecum parvum'' is a digeneic trematode or flatworm (Platyhelminthes) that is parasitic to the intestine of the common bully (''Gobiomorphus cotidianus'') or upland bully (''G. breviceps''). The common and upland bully are freshwater fish of New Zealand that ''C. parvum'' uses as its definitive host. ''C. parvum'' is a hermaphroditic freshwater trematode that can omit its definitive host and produce eggs by selfing or progenesis inside its amphipod second intermediate host (Lagrue et al., 2001) == Life cycle == The life cycle of ''C. parvum'' begins when eggs are released into the water and hatch into free-swimming miracidia. The miracidia then penetrate the first intermediate host, ''Potamopyrgus antipodarum'' (the New Zealand mud snail), where they multiply and develop into sporocysts. Next, free-living cercariae are asexually produced from the sporocysts and shed by the snails. These shed cercarial larvae then penetrate the hemocoel of the second interemediate host, ''Paracalliope fluviatilis''(amphipod) and encyst as metacercariae (Kelly, 2009). At this stage, the metacercariae have two options: 1) to wait for the bully (the definitive host) to eat the amphipod or 2) to undergo selfing (progenesis). ''C. parvum'' will take up residence in the bully intestine where it will mature and reproduce eggs sexually (if it finds a partner) or via self-fertilization (since trematodes are hermaphroditic). However, if the amphipod is not eaten, the ''C. parvum'' metacercariae mature within the amphipod where they produce viable eggs within the cyst in the hemocoel (body cavity) (Lefebvre, 2005). Eggs produced in this fashion remain enclosed in the cyst until the amphipod dies. After amphipod death, the eggs are released into the water where they hatch into miracidia and are infective to the snail (Kelly, 2009). The process of maturing within the intermediate host and eliminating the need for the definitive host is known as progenesis (Lagrue, 2001) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coitocaecum parvum」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.