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The radula (US: / ˈ r æ dʒ ʊ l ə /; pl.: radulae or radulas) [1] is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. [2] It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus .
For nearly 200 years, Radula remained the only genus in the family, making Radulaceae a monogeneric family within the order Porellales. [7] Herbert Castle's 1936 worldwide monograph of Radula took a broader view of Cladoradula, expanding it to include all species with reproductive structures on short branches, regardless of other features. This ...
The mouth is located on the underside of the animal, and contains a tongue-like structure called a radula, which has numerous rows of 17 teeth each. The teeth are coated with magnetite, a hard ferric/ferrous oxide mineral. The radula is used to scrape microscopic algae off the substratum.
80% of solenogaster species have a radula, while in others it is secondarily lost. The radula may bear one or more teeth per row; where there is more than one tooth, there is no central radular tooth. [3] The radula grows by dividing existing teeth in two, or by adding a new tooth at the centre of the radular row. [3]
Radula is the second most diverse liverwort genus found in Baltic and Bitterfeld amber, after Frullania which has nine species. However, since these amber deposits formed from conifer resin, the fossils may only represent species that grew on these trees, while other Radula species that lived primarily on other plant hosts may not have been ...
These characteristics, combined with its ancient divergence, suggested it had been evolving independently from other Radula species for a very long time. The recognition of Dactyloradula as a separate genus brought the total number of genera in the family Radulaceae to three, alongside Radula and Cladoradula. [3]
Radula acutiloba Steph. Radula aguirrei R.M.Schust. ex M.A.M.Renner Radula allisonii Castle Radula amentulosa Mitt. Radula amoena Herzog Radula anceps Sande Lac. Radula aneurysmalis (Hook.f. & Taylor) Gottsche, Lindenb. & Nees Radula angulata Steph. Radula anisotoma M.A.M.Renner Radula appressa Mitt. Radula aquilegia (Hook.f. & Taylor) Gottsche ...
Radula visianica; This page was last edited on 17 November 2024, at 01:35 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...