sacculina externa (English spelling) sacculinaexterna

...The cell mass passes through the needle and enters the host's body, and reaches the intestines through the host's bloodstream, attaches there, and extends root-like branches in all directions (this stage is called the internal stage of the sacculina interna). The roots spread throughout the host's body, and the nodes of the roots that have extended into the abdominal tissues reveal a pouch-like body on the outside as the host molts (this stage is called the external stage of the sacculina externa). The roots also spread to the host's muscles, digestive tract, midgut gland (hepatopancreas), nerves, and gonads, destroying tissue and absorbing nutrients from these tissues and body fluids. ...

*Some of the terminology that mentions "sacculina externa" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…細胞塊はこの注射針の中を通って宿主の体内に入り，宿主の血液の流れによって腸に達し，そこに付着し，根状の枝を四方にのばす(この時期をフクロムシの体内期sacculina internaという)。根状部は宿主の体内のいたるところに張りめぐらされ，腹部の組織内にのびてきた根状部の結節は，宿主の脱皮とともに外部に袋状の体を現す(この時期をフクロムシの体外期sacculina externaという)。根状部は宿主の筋肉，消化管，中腸腺(肝膵臓)，神経や生殖腺などにも広がり，組織を破壊し，これらの組織や体液から養分を吸収する。…

※「sacculina externa」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報