Specimen image via iDigBio · BY-NC
Polycladida
Sign in to saveThe Polycladida represents a highly diverse clade of free-living marine flatworms. They are known from the littoral to the sublittoral zone (extending to the deep hot vents), and many species are common from coral reefs. Only a few species are found in freshwater habitats.
Species
polyclades
Order
- PhylumPlatyhelminthes
- OrderPolycladida
ヒラムシ（扁虫、平虫）は、磯の石の下にすむ扁形動物渦虫鋼ヒラムシ目（多岐腸目）動物の総称。海産で、岩の表面等を這って生活している。一部には寄生種がある。 体は扁平で、表面は粘液で覆われている。頭部背面には触角のような突起を持つものがある。
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Museum specimens
- Specimen records
- 446
- With media
- 141
- Collections
- CAS
- Recorded in
- United States, Papua New Guinea, Mexico, New Zealand, Maldives, Solomon Islands
~3 min read
Encyclopedic overview
7 sectionsContents
- Description
- Development
- Ecology
- Systematics
- Phylogeny
- Images
- References
The Polycladida represents a highly diverse clade of free-living marine flatworms. They are known from the littoral to the sublittoral zone (extending to the deep hot vents), and many species are common from coral reefs. Only a few species are found in freshwater habitats.
== Description == Polyclads range from to in length with a flattened, roughly oval, body shape and, in many cases, a pair of short tentacles on the head. They are distinguished from other related animals by the presence of a folded pharynx, an elongated intestine with numerous complex diverticula, and multiple ocelli.
Excerpted from Wikipedia’s “Polycladida” article, available under the CC BY-SA 4.0 licence.