What does the word planarian mean?
What does the word planarian mean?
planarian. / (pləˈnɛərɪən) / noun. any free-living turbellarian flatworm of the mostly aquatic suborder Tricladida, having a three-branched intestine.
What are the characteristics of planaria?
The planarian has a soft, flat, wedge-shaped body that may be black, brown, blue, gray, or white. The blunt, triangular head has two ocelli (eyespots), pigmented areas that are sensitive to light.
What happens if you cut a planaria in half?
They are flatworms and usually found in freshwater, and can reproduce asexually. Planaria are one of the most primitive organisms to have a central nervous system. And if you cut them up, they grow back, nervous system intact, no matter what part you slice. Each piece grows into its own, fully formed organism.
What is the common name of planaria?
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.
What is a planarian asexual reproduction?
Asexual freshwater planarians reproduce by tearing themselves into two pieces by a process called binary fission. The resulting head and tail pieces regenerate within about a week, forming two new worms. Understanding this process of ripping oneself into two parts poses a challenging biomechanical problem.
How does a planarian move?
Some planarians move by beating cilia (protuberances of epithelial cells), which allows them to glide. Others move by contracting muscles and undulating their bodies. Each planarian has a bilobate (two-lobed) brain in its anterior region, and two lateral and ventral nerve cords that run through the length of its body.
What is the importance of planaria?
Planaria is a member of the Phylum Platyhelminthes including flatworms. Planarians possess the unique ability of regeneration from adult stem cells or neoblasts and finds importance as a model organism for regeneration and developmental studies.
Can planaria live in humans?
A parasitic flatworm that infects hundreds of millions of people in the developing world is able to survive in the bloodstream for decades by constantly renewing its skin – a mechanism that could inform potential new treatments against infection.
Can Planaria infect humans?
While they pose no danger to humans or plants, Land Planarians have been labeled a nuisance in the southern United States in particular, and have been known to decimate earthworm populations in farms and earthworm rearing beds.
How does a flatworm reproduce?
Flatworms are hermaphroditic (having both male and female sex organs) and they typically reproduce both sexually and asexually. The majority of sexual reproduction is through cross-fertilization (where both individuals fertilize each other).
How planaria reproduce explain with diagram?
When Planaria is cut into pieces, each piece grows into a complete organism. This is the regeneration process which is carried out by the special cells. Also, regeneration is different from the reproduction. This is because most of the organisms do not depend on being cut in order to reproduce.
What is the meaning of planarian?
Definition of planarian : triclad especially : any of various dark-colored freshwater triclad flatworms (family Planariidae) with two eyespots and a triangular head : any of the family Planariidae or order Tricladida comprising small soft-bodied ciliated mostly aquatic turbellarian worms
How many genes does a planarian have?
For the planarian, the researchers were able to identify roughly 1,000 likely genes that are probably specific to these organisms. — John Timmer, Ars Technica, 25 Jan. 2018 That’s exactly what happened with earlier attempts to sequence the planarian and axolotl genomes.
What is a family?
In its most basic terms, a family is a group of individuals who share a legal or genetic bond, but for many people, family means much more, and even the simple idea of genetic bonds can be more complicated than it seems. (Mayntz, 2005) In the most basic definition, a group of people who share a legal bond or a blood bond is a family.
When does severance occur in planaria?
— Matthew Hutson, The New Yorker, 3 May 2021 Severance occurs when the tail tip adheres to the substratum and the rest of the planarian pulls away. — Chris Ciaccia, Fox News, 23 May 2018