In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other mollusks. See more The radula is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the See more The number, shape, and specialized arrangement of molluskan teeth in each transverse row is consistent on a radula, and the different … See more The radula is used in two main ways: either as a rake, generally to comb up microscopic, filamentous algae from a surface; or as a rasp, to feed directly on a plant. The rhipidoglossan (see below) and, to a lesser extent, the taenigloissan radular types are … See more Each row of the polyplacophoran radula has two mineralized teeth used to abrade the substrate, and two longer teeth that sweep up any … See more A typical radula comprises a number of bilaterally-symmetrical self-similar rows of teeth rooted in a radular membrane in the floor of their mouth cavity. Some species have teeth that bend with the membrane as it moves over the odontophore, whereas in other … See more The morphology of the radula is related to diet. However, it is not fixed per species; some mollusks can adapt the form of their radular teeth according to which food sources are abundant. Pointed teeth are best suited to grazing on algal tissue, … See more The first bona fide radula dates to the Early Cambrian, although trace fossils from the earlier Ediacaran have been suggested to have been made by the radula of the organism See more WebThe meaning of RADULA is a horny band or ribbon in mollusks other than bivalves that bears minute chitinous teeth on its dorsal surface and scrapes or tears off food and …
Radula - Wikipedia
WebFeb 21, 2024 · 1) You will be given a briefing document that outlines the scenario and your objectives and will be given 20-30 minutes to prepare. 2) You will then begin the role-play exercises. (Usually with one of the assessors – often this will be the line manager for one of the roles that are being recruited.) Webthe evolutionary process by which reproductively isolated biological populations evolve to become distinct species. Sympatric the process through which new species evolve from … on what writer did harper lee base dill
Chapter 25 Urinary System (REABSORPTION) Flashcards Quizlet
WebAug 1, 2016 · The radula, therefore, represents a key innovation which allowed for the evolution of the calcified lower jaws in Jurassic and Cretaceous aptychophoran ammonites. Possible triggers for this... WebThe radula (rasping tongue) is the central foraging organ and innovation of the Mollusca, which make up one of the most specious animal phyla ( Ponder and Lindberg 2008; Rosenberg 2014) and have successfully colonized habitats ranging from mountain peaks to deep sea vents ( Brusca and Brusca 2003 ). WebWhen the radula is extended, it contacts the substrate, and algal particles are scraped off when retractors pull the radula back into the mouth. The radula may also … on what wrist do men wear watches