Stomach sucking - Kyuui

Japanese: 吸胃 - きゅうい

...In platyhelminthes, annelids, arthropods, and echinoderms, the differentiation of the stomach and intestine is generally not significant, so the midgut is called the stomach and intestine or simply the intestine. The sucker stomach of arachnids and the chewing stomach of crustaceans are differentiated from the foregut region, and the inner surface is covered with a thin cuticle layer and may form hard tooth-like projections. [Hideji Harada]
[Vertebrate stomach]
The stomach of fish is tubular and not clearly distinguishable from the esophagus.

From [Pharynx]

…This type is called a compound pharynx, but in the sclerenchyma, the circular and radial muscles are simply developed and it is called a simple pharynx. In the phylum Platyhelminthes, the class Trematoda, the pharynx swells into a spherical shape and acts as a pump to suck in food, but in the phylum Arachnida, the function is similar and it is called a sucker stomach. The phylum Pscutellari is a diverse group of animals, including the classes Rotifera, Gastrotricha, and Nematoda, but in general, the pharynx is well developed and plays a role in mechanical digestion, and rotifers in particular are equipped with a chewing plate. …

*Some of the terminology explanations that mention "suction stomach" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…扁形動物･環形動物･節足動物･棘皮（きよくひ）動物などでは一般に胃と腸の分化は顕著でないので，中腸域は胃腸あるいは単に腸とよばれる。蛛形（ちゆけい）類の吸胃や甲殻類の咀嚼（そしやく）胃は前腸域が分化したもので，内面は薄いクチクラ層で覆われ，歯状の硬い突起を形成することもある。【原田英司】
［脊椎動物の胃］
　魚類の胃は管状で，食道との区別が明りょうではない。…

【咽頭】より

…この型を複咽頭とよぶが，棒腸類では単に環状筋と放射状筋が発達しただけであって単咽頭とよぶ。また，扁形動物門吸虫綱では咽頭は球形にふくらみ，食物を吸い込むポンプとしてはたらくが，節足動物門蛛形（ちゆけい）綱でも機能的には同様で，吸胃とよばれる。袋形動物門は輪虫綱，腹毛綱，線虫綱など変化に富んだ動物群であるが，一般に咽頭がよく発達し，機械的消化の役を果たすが，とくに輪虫類では咀嚼（そしやく）板を備えている。…

※「吸胃」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

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