Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos
planarian
Table of Contents
Introduction References & Edit History Related Topics
Images
planarian planarian nervous system invertebrates
Quizzes
Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
Animal Group Names
Lion (panthera leo)
Deadliest Animals Quiz
Mute swan with cygnet. (birds)
Match the Baby Animal to Its Mama Quiz
vulture. An adult bearded vulture at a raptor recovery center. The Gypaetus barbatus also known as the Lammergeier or Lammergeyer, is a bird of prey and considered an Old World vulture.
Animal Factoids
Read Next
Cook Strait giant weta (Deinacrida rugosa) found on Matiu/Somes Island in the harbour of Wellington, New Zealand. Dec. 17, 2009 insect
Big Bugs and Colossal Crabs: 7 Invertebrates of Unusual Size
Praying mantis (sphodromantis gastrica)
Why Do Some Animals Eat Their Mates After Sex?
Discover
Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.
10 of the World’s Most Dangerous Fish
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.
What’s the Difference Between Modern and Contemporary Art?
Close-up of ostriches (Struthio camelus) necks and heads; location unknown.
6 of the World's Most Dangerous Birds
Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
7 Winter Solstice Celebrations From Around the World
Srinivasa Ramanujan, Indian mathematician and autodidact.
6 Interesting Facts about Srinivasa Ramanujan
Hemp (Cannabis sativa).
9 Mind-Altering Plants
planarian
planarian Planarians are usually about 3 to 15 mm (0.1 to 0.6 inch) long; however, some grow to more than 30 cm (about 1 foot) long.

planarian

flatworm
Share
Share to social media
URL
https://mainten.top/animal/planarian
Feedback
Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login).
Thank you for your feedback

Our editors will review what you’ve submitted and determine whether to revise the article.

External Websites
Britannica Websites
Articles from Britannica Encyclopedias for elementary and high school students.
Written and fact-checked by
The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.
The Editors of Encyclopaedia Britannica
Article History

planarian, (class Turbellaria), any of a group of widely distributed, mostly free-living flatworms of the class Turbellaria (phylum Platyhelminthes). Planaria is the name of one genus, but the name planarian is used to designate any member of the family Planariidae and related families. Most planarians occur in fresh water and are sometimes seen in large masses; some species are marine, others are terrestrial. Some species are parasitic; i.e., they obtain nourishment from the body of another living animal. The body, when elongated, is soft, leaf-shaped, and ciliated. The spade-shaped head has two eyes and sometimes tentacles. The tail is pointed. ...(100 of 336 words)

Access the full article
Help support true facts by becoming a member.