Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Plural form of
planarian .
Etymologies
Sorry, no etymologies found.
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Examples
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Sightings of "hammerhead worms" (actually terrestrial planarians) up to 14 inches in length are freaking out some Alabama folk.
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That's the characteristic behavior of these planarians.
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Sightings of "hammerhead worms" (actually terrestrial planarians) up to 14 inches in length are freaking out some Alabama folk.
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That's the characteristic behavior of these planarians.
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In a new study published this month in the Proceedings of the National Academy of Sciences, Newmark and his colleagues at the U. of I. report that planarians share some important characteristics with mammals that may help scientists tease out the mechanisms by which germ cells are formed and maintained.
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Study of planarians offers insight into germ cell development
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Unlike fruit flies and nematodes, which show signs of germ cell initiation in the earliest stages of their embryonic development, planarians do not generally express nanos or produce germ cells until several days after hatching.
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A few species of freshwater planarians actually fragment their body into several pieces, each of which regenerate to form several small worms.
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They can only sense light versus dark, but that is enough for them to get by as planarians.
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Even first-year biology students know about eye spots in planarians which are simple pigment patches at the front of the worm that are connected to their simple nervous system.
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