sacculina interna (English spelling) sacculinainterna

...Eventually, a chitinous needle-like tube extends from the front end of the Kentrogon larva, and its tip breaks through the membrane at the base of the host's setae. The cell mass passes through this needle and enters the host's body, and reaches the intestine via the host's bloodstream, attaches there, and extends root-like branches in all directions (this stage is called the internal stage of the sacculina sacculina). The root-like parts are spread throughout the host's body, and the nodes of the root-like parts that have extended into the abdominal tissues reveal a bag-like body on the outside as the host sheds its skin (this stage is called the external stage of the sacculina sacculina). ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…やがて，ケントロゴン幼生の前端からはキチン質の注射針のような筒がのび，その先端は宿主の剛毛の根もとの膜を突き破る。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)。…

※「sacculina interna」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