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.
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. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic—i.e., living on or in another organism and securing nourishment from it.
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： πλατύ platy 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 ...
Phylum Platyhelminthes- Characteristics, Classification and …
网页Characteristics of Platyhelminthes. Platyhelminthes have the following important characteristics: They are triploblastic, acoelomate, and bilaterally symmetrical. They may be free-living or parasites. The body has a soft covering with or without cilia. Their body is dorsoventrally flattened without any segments and appears like a leaf.
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 ...
28.3B: Phylum Platyhelminthes - Biology LibreTexts
网页2023年10月31日 · Platyhelminthes are divided into four classes: Turbellaria, free-living marine species; Monogenea, ectoparasites of fish; Trematoda, internal parasites of humans and other species; and Cestoda (tapeworms), which are …
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 1A,B). Often speculated in the classic literature to represent primitive basal bilaterians, modern molecular phylogenetic analyses place the Platyhelminthes within the Lophotrochozoa, a clade of ...
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.
14.1: Phylum Platyhelminthes - Biology LibreTexts
网页2022年7月31日 · Learning Objectives. The flatworms are acoelomate organisms that include many free-living and parasitic forms. Most of the flatworms are classified in the superphylum Lophotrochozoa, which also includes the mollusks and annelids. The Platyhelminthes consist of two lineages: the Catenulida and the Rhabditophora.
Habitats and types of flatworms | Britannica
网页flatworm, or platyhelminth, Any of a phylum (Platyhelminthes) of soft-bodied, usually much-flattened worms, including both free-living and parasitic species. Flatworms live in a variety of marine, freshwater, and terrestrial habitats worldwide.