Definitions for planarian
pləˈnɛər i ənpla·nari·an

Princeton's WordNetRate this definition:0.0 / 0 votes

1. planarian, planarianoun

   free-swimming mostly freshwater flatworms; popular in laboratory studies for the ability to regenerate lost parts

WiktionaryRate this definition:0.0 / 0 votes

1. planariannoun

   Any of various freshwater flatworms, of the family Planariidae.

2. Etymology: From Planaria (from planarius, from planum)

WikipediaRate this definition:0.0 / 0 votes

1. Planarian

   A planarian is one of the many flatworms of the traditional class Turbellaria. It usually describes free-living flatworms of the order Tricladida (triclads), although this common name is also used for a wide number of free-living platyhelminthes. Planaria are common to many parts of the world, living in both saltwater and freshwater ponds and rivers. Some species are terrestrial and are found under logs, in or on the soil, and on plants in humid areas. The triclads are characterized by triply branched intestine and anteriorly situated ovaries, next to the brain. Today the order Tricladida is split into three suborders, according to their phylogenetic relationships: Maricola, Cavernicola and Continenticola. Formerly, the Tricladida was split according to habitats: Maricola, which is marine; Paludicola which inhabits freshwater; and Terricola, which is land-dwelling.Planaria exhibit an extraordinary ability to regenerate lost body parts. For example, a planarian split lengthwise or crosswise will regenerate into two separate individuals. Some planarian species have two eye-spots (also known as ocelli) that can detect the intensity of light, while others have several eye-spots. The eye-spots act as photoreceptors and are used to move away from light sources. Planaria have three germ layers (ectoderm, mesoderm, and endoderm), and are acoelomate (they have a very solid body with no body cavity). They have a single-opening digestive tract; in Tricladida planarians this consists of one anterior branch and two posterior branches. Planarians move by beating cilia on the ventral dermis, allowing them to glide along on a film of mucus. Some also may move by undulations of the whole body by the contractions of muscles built into the body membrane.Triclads play an important role in watercourse ecosystems and are often very important as bio-indicators.The most frequently used planarian in high school and first-year college laboratories is the brownish Girardia tigrina. Other common species used are the blackish Planaria maculata and Girardia dorotocephala. Recently, however, the species Schmidtea mediterranea has emerged as the species of choice for modern molecular biological and genomic research due to its diploid chromosomes and the existence of both asexual and sexual strains. Recent genetic screens utilizing double-stranded RNA technology have uncovered 240 genes that affect regeneration in S. mediterranea. Many of these genes have orthologs in the human genome.

ChatGPTRate this definition:0.0 / 0 votes

1. planarian

   A planarian is a type of flatworm in the class Turbellaria, typically living in freshwater habitats or damp terrestrial environments. They are known for their regenerative abilities, being able to re-grow entire parts of their bodies if they are damaged or removed. They have a simple brain and two eye spots that can detect the intensity of light. Planarians move by using cilia on their bellies to glide along a trail of mucus. These worms are hermaphrodites, containing both female and male reproductive organs.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Planariannoun

   one of the Planarida, or Dendrocoela; any turbellarian worm

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Planarian

   plā-nā′ri-an, adj. and n. a term practically coextensive with Turbellarian, applicable to the members of the lowest class of worm-like animals, living in fresh and salt water, and sometimes in damp earth.—adjs. Planar′iform, Planā′rioid. [L. planarius, flat.]

Matched Categories

1. • Flatworm

Usage in printed sourcesFrom: 

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How to pronounce planarian?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

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   Fred

   US English

   Tessa

   South African

How to say planarian in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of planarian in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of planarian in Pythagorean Numerology is: 5

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=planarian
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Planarian
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Planarian
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/planarian
6. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=planarian
7. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=planarian