A planarian, also called a triclad, is a free-living flatworm of the order Tricladida, found in marine, freshwater and terrestrial settings and grouped into three suborders, Maricola, Cavernicola and Continenticola. It is a bilateral flatworm without a body cavity, with a three-branched intestine, and lacks circulatory or respiratory systems, absorbing oxygen through its skin, moving by cilia and muscular contraction, and reproducing sexually, asexually by fission, or both depending on species. Planarians are known for their ability to regenerate missing tissues and organs, a process driven by abundant adult stem cells called neoblasts, which makes them important research models for regeneration, stem cells, aging, toxicology, genetics and memory.
Facts
Classification
System (Realm) Relationship to PeopleInvasive or Introduced Species 1 Living or Extinct Partially Attested
Scientific NameSource describes the phylum Platyhelminthes (flatworms); the entity's existing description centers on planarians (order Tricladida), a subgroup, so the rank may differ. Identification
Distinguishing AppearanceSoft, unsegmented bodies 1 Comparison
CITES Appendix Connections
Child Taxon Of
In Ecosystem
Source Wikidata: Tiger
Additional Source Wikipedia: Lake BaikalArticle text
In the Other Atlases
Found In
Also in Geography Atlas: where this subject is found.
Also in Geography Atlas: where this subject is found.
Also in Geography Atlas: where this subject is found.
Also in Geography Atlas: where this subject is found.
Sources
1. Wikipedia: Flatworm
Distinguishing features, sentence 1
Platyhelminthes are bilaterally symmetrical animals
Distinguishing features, last sentence
Their bodies are soft and unsegmented.
diet-classification (MediaWiki batch-API article extract states it plainly)
Platyhelminthes (from Ancient Greek πλατύ (platy) 'flat' and ἕλμινς (helmins) 'parasitic worm') is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms.
system (MediaWiki batch-API article extract states it plainly)
Free-living flatworms are mostly predators, and live in water or in shaded, humid terrestrial environments, such as leaf litter.
article text (relationship to people), EntityId 295852
It was first observed as an invasive species on Guam and was then released in the Philippines and Maldives.
View the Source2. Wikidata (taxon extant/extinct status)
Wikimedia Foundation / Wikidata contributorsQ124900, descriptionView the Source 3. UNEP-WCMC Species+ database (CITES Secretariat): Species+: Animalia
UNEP-WCMC Species+ database (CITES Secretariat)Species+ taxon_concepts, id 23Quote, Species+ taxon_concepts, id 23
"cites_listing":"I/II/III/NC","eu_listing":"A/B/C/D/NC","higher_taxa":{"kingdom":"Animalia","phylum":null,"class":null,"order":null,"family":null},"synonyms":[],"common_names":[{"name":"Animals","language":"EN"},{"name":"Fauna","language":"EN"},{"name":"Animaux","language":"FR"}],"cites_listings":[]
Wikidata: Platyhelminthes
- Wikidata Q124900, class allow-list match (w-wdresolver-0926)
- Child Taxon Of: Spiralia, Wikidata P171 (parent taxon)
View the SourceWikipedia: Lake Baikal
WikipediaIn Ecosystem: Lake Baikal, Article textQuote, In Ecosystem: Lake Baikal, Article text
More than 140 endemic flatworm (Plathelminthes) species are in Lake Baikal, where they occur on a wide range of bottom types.
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