An animal that lacks a coelom. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbonworm, exhibit bilateral symmetry and possess one internal space, the digestive cavity.
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美
- 無(wú)體腔動(dòng)物：沒(méi)有體腔的動(dòng)物。無(wú)體腔動(dòng)物包括扁蟲(chóng)、吸蟲(chóng)、絳蟲(chóng)或紐蟲(chóng)。為兩側對稱(chēng)，有一內部消化腔
