| dbo:abstract |
Els crustacis poden passar per una sèrie de fases larvàries i immadures entre l'eclosió dels seus ous i la seva forma adulta. Cadascuna de les etapes està separada per una muda, en la qual es treu l' exoesquelet dur per permetre que l'animal creixi. Les larves de crustacis solen tenir poca semblança amb l'adult, i encara hi ha casos on no es coneixen quines larves creixeran en quins adults. Això és especialment cert amb els crustacis que viuen com a adults bentònics (sobre el llit del mar), més que no pas on les larves són plàncton i, per tant, més fàcilment capturades. Moltes larves de crustacis no van ser reconegudes immediatament com a larves quan van ser descobertes i es van qualificar de gèneres i espècies noves. Els noms d'aquests gèneres s'han generalitzat per cobrir etapes larvàries específiques en amplis grups de crustacis, com ara "zoea" i "nauplius". Altres termes descrivien formes que només es troben en grups particulars, com ara la "glaucothoe" del cranc eremita, o el fil·losoma de la llagosta espinosa. (ca) Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult, in which the hard exoskeleton is shed to allow the animal to grow. The larvae of crustaceans often bear little resemblance to the adult, and there are still cases where it is not known what larvae will grow into what adults. This is especially true of crustaceans which live as benthic adults (on the sea bed), more-so than where the larvae are planktonic, and thereby easily caught. Many crustacean larvae were not immediately recognised as larvae when they were discovered, and were described as new genera and species. The names of these genera have become generalised to cover specific larval stages across wide groups of crustaceans, such as zoea and nauplius. Other terms described forms which are only found in particular groups, such as the glaucothoe of hermit crabs, or the phyllosoma of slipper lobsters and spiny lobsters. (en) |
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right (en) |
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Juvenile (en) Nauplius (en) Adult (en) Adult Penaeus monodon (en) Nauplius larva (en) Zoea (en) Ventral view of a Tetraclita nauplius, showing cephalic appendages (en) Close-up of an adult Triops , showing a persistent naupliar eye between the two compound eyes (en) |
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horizontal (en) vertical (en) |
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Cyclops (en) Carcinus maenas (en) Anatomy of nauplii (en) Larval and adult prawns (en) |
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center (en) |
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Shrimp nauplius.jpg (en) Penaeus monodon.jpg (en) Carcinus maenas, zoea larva.png (en) Crab Cangrexo 66eue.jpg (en) Cyclops.jpg (en) Nauplius larva of a cyclops copepod.jpg (en) Triops closeup.jpg (en) EB1911 Crustacea Fig. 15.—Nauplius of Tetraclita porosa.jpg (en) |
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| rdfs:comment |
Els crustacis poden passar per una sèrie de fases larvàries i immadures entre l'eclosió dels seus ous i la seva forma adulta. Cadascuna de les etapes està separada per una muda, en la qual es treu l' exoesquelet dur per permetre que l'animal creixi. Les larves de crustacis solen tenir poca semblança amb l'adult, i encara hi ha casos on no es coneixen quines larves creixeran en quins adults. Això és especialment cert amb els crustacis que viuen com a adults bentònics (sobre el llit del mar), més que no pas on les larves són plàncton i, per tant, més fàcilment capturades. (ca) Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult, in which the hard exoskeleton is shed to allow the animal to grow. The larvae of crustaceans often bear little resemblance to the adult, and there are still cases where it is not known what larvae will grow into what adults. This is especially true of crustaceans which live as benthic adults (on the sea bed), more-so than where the larvae are planktonic, and thereby easily caught. (en) |
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Larves dels crustacis (ca) Crustacean larva (en) |
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