Pentastomida - Pentastomida

Japanese: 舌形動物 - ぜっけいどうぶつ（英語表記）Pentastomida

A general term for the species that form the phylum Glossomorpha, and their Japanese name is Shitamidushi-rui. They generally have a body length of around 1 cm, with larger species reaching 30-45 cm. They have a long, slender body shape consisting of 16-130 segments, and are internal parasites of dogs, goats, rabbits, crocodiles, snakes, frogs, and seagulls. Those that parasitize the lungs are cylindrical, while those that parasitize the nasal cavity are flattened dorsoventrally. The cephalothorax consists of three unclear segments, and has two pairs of clawed warts. The torso has many superficial segments. They have no circulatory or respiratory systems. They mate and lay eggs inside the host's body, but the eggs enter the intermediate host (small mammals, amphibians, or fish), leave the eggshell, become the first stage larvae, and grow while molting inside the host's body. When the intermediate host is eaten by a larger animal, the eggs move from the stomach to the nasal cavity, lungs, trachea, intestines, etc. Approximately 70 species are known. Their body structure indicates an affinity to millipedes and arthropods, but recent molecular analysis has led to the suggestion that they should be considered a group of arthropods.

Rhettoid animals

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Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

舌形動物門を形成する種類の総称で，和名はシタムシ類。体長は一般に 1cm内外で，大型種は 30～45cmに達する。 16～130体節から成る細長い体形で，イヌ，ヤギ，ウサギ，ワニ，ヘビ，カエル，カモメなどに内部寄生するが，肺に寄生するものは円筒形，鼻腔に寄生するものは背腹に扁平である。頭胸部は不明瞭な3節から成り，鉤爪をもつ2対の疣足 (いぼあし) がある。胴部には表面的な環節が多数みられる。循環器系，呼吸器系はない。宿主の体内で交尾，産卵するが，卵は中間宿主である小型哺乳類，両生類，魚類の体内に入り，卵殻を出て第1次幼虫になり，宿主の体内を回って脱皮しながら成長する。中間宿主が大型の動物に食べられると胃から鼻腔，肺，気管，腸などに移る。約 70種が知られている。体制はヤスデ類と節足動物への類縁関係を示しているが，近年の分子分析の結果から節足動物の1群とする考えも提唱されている。