Flatworm - Wikipedia
网页The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") [4] are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Platyhelminthes: Current Biology - Cell Press
网页2017年4月3日 · Platyhelminthes (platy = flat and helminth = worm), or simply ‘flatworms’, are dorsoventrally flattened and bilaterally symmetrical worms (Figure 1 A,B).
扁形动物门 - 维基百科，自由的百科全书
网页扁形动物门 （學名： Platyhelminthes；語源： πλατύplaty 扁平 + ἑλμινθ-helminth- 蟲 [ 2 ]）是 动物界 的一个门，是一类簡單的無環節 两侧对称动物，屬於 無脊椎動物，有三胚层，无 体腔，無 呼吸 及 循環系統，有 口，但无 肛门，所以必須保持身體扁平，以使 氧氣 及 養料 能夠透過 滲透 來吸收。 消化腔只有一個開口，同時用於進食及排泄；所以食物在其體內無法有效處理。 已记录的扁形动物约有29500种 [ 3 ]。 生活於淡水、海水等潮溼處，體 …
28.3B: Phylum Platyhelminthes - Biology LibreTexts
网页2023年10月31日 · The epidermal tissue is a single layer cells or a layer of fused cells (syncytium) that covers a layer of circular muscle above a layer of longitudinal muscle. The mesodermal tissues include mesenchymal cells that contain collagen and support secretory cells that secrete mucus and other materials at the surface.
ADW: Platyhelminthes: INFORMATION
网页ADW: Platyhelminthes: INFORMATION. Platyhelminthes flatworms. By Phil Myers. Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom (acoelomate) but that do have three germ layers. Some forms are free living but many are parasitic.
14.10: Phylum Platyhelminthes - Biology LibreTexts
网页2022年7月31日 · Most flatworms, such as the planarian shown in Figure 1, have a gastrovascular cavity rather than a complete digestive system. In such animals, the “mouth” is also used to expel waste materials from the digestive system. Some species also have an anal opening. The gut may be a simple sac or highly branched.
Flatworm | Reproduction, Examples, & Characteristics | Britannica
网页2024年8月9日 · Flatworm, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. Several species are free-living, but about 80 percent are parasitic. They are bilaterally symmetrical and lack specialized respiratory, skeletal, and circulatory systems; no body cavity (coelom) is present.
Acoelomate Animals | The Diversity of Animal Life - Biocyclopedia
网页Characteristics of Phylum Platyhelminthes. Three germ layers (triploblastic) Bilateral symmetry; definite polarity of anterior and posterior ends. Body flattened dorsoventrally; oral and genital apertures mostly on ventral surface.
扁形动物门 - 百度百科
网页扁形动物门，Platyhelminthes，是动物界的一个门， 无脊椎动物，是一类 两侧对称，三 胚层，无 体腔，无 呼吸系统 、无 循环系统，有口无肛门的动物。. 已记录的扁形动物约有15000种。. 生活于淡水、海洋等潮湿处，体前端有两个可感光的色素点（眼点）。. 体表 ...
Phylum Platyhelminthes- Characteristics, Classification and …
网页Platyhelminthes are also known as flatworms, belonging to the kingdom Animalia. These are triploblastic, acoelomate, dorsoventrally flattened, and bilaterally symmetrical organisms, found as free-living, or in the body of a host.
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