Metanauplius

Metanauplius
A pseudometanauplius of the krill species Nematoscelis difficilis hatches using the push-off hatching technique

Metanauplius is an early larval stage of some crustaceans such as krill. It follows the nauplius stage.

In sac-spawning krill,[Note 1] there is an intermediary phase called pseudometanauplius, a newly hatched form distinguished from older metanauplii by its extremely short abdomen. In some species, this form is not considered a separate developmental stage as it develops into a metanauplius without molting; in other species such as Nyctiphanes couchii, it can be separated from the metanauplius stage by the molt of a very thin cuticle soon after hatching.[1]

Broadcast-spawning species of krill do not have a pseudometanauplius stage. They generally hatch in the nauplius 1 stage, but recently have been discovered to hatch sometimes as metanauplius or even as calyptopis stages.[2]

See also

Footnotes

  1. ^ There are two kinds of spawning mechanisms in krill. Females of broadcast spawning species just release the fertilized eggs into the water, where they sink, disperse, and are on their own. In sac-spawning species, the female carries the eggs with her attached to her rearmost pairs of thoracopods until they hatch.

References

  1. ^ Jaime Gómez-Gutiérrez (2003). "Hatching mechanism and accelerated hatching of the eggs of a sac-spawning euphausiid Nematoscelis difficilis" (PDF). Journal of Plankton Research 25 (11): 1397–1411. doi:10.1093/plankt/fbg095. http://reo.nii.ac.jp/journal/HtmlIndicate/Contents/SUP0000003000/JOU0003000131/ISS0000090051/ART0000975007/ART0000975007.pdf. 
  2. ^ Jaime Gómez-Gutiérrez (2002). "Hatching mechanism and delayed hatching of the eggs of three broadcast spawning euphausiid species under laboratory conditions" (PDF). Journal of Plankton Research 24 (12): 1265–1276. doi:10.1093/plankt/24.12.1265. http://reo.nii.ac.jp/journal/HtmlIndicate/Contents/SUP0000003000/JOU0003000131/ISS0000015774/ART0000182425/ART0000182425.pdf. 

Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Metanauplius — Métanauplius Métanauplius désigne l un des stades larvaires de certains crustacés, comme les crevettes par exemple. Les métanauplii sont une source de nourriture importante pour les poissons, notamment pour les larves de poisson. Description La… …   Wikipédia en Français

  • Métanauplius — désigne l un des stades larvaires de certains crustacés, comme les crevettes par exemple. Les métanauplii sont une source de nourriture importante pour les poissons, notamment pour les larves de poisson. Description La larve se présente sous la… …   Wikipédia en Français

  • Metanauplius — Met a*nau pli*us, n. [NL. See {Meta }, and {Nauplius}.] (Zo[ o]l.) A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages. [1913 Webster] …   The Collaborative International Dictionary of English

  • Metanauplīus — Metanauplīus, ein auf das sechsbeinige Naupliusstadium der Krebse folgendes Entwickelungsstadium der zehnfüßigen Krebse …   Meyers Großes Konversations-Lexikon

  • metanauplius — A stage of development between the nauplius and calyptopis in euphausiids. A vestigial abdomen is present [Mauchline, 1984]. Developmental stage following the nauplius larval stage and bearing the same three appendages but having additional body… …   Crustacea glossary

  • metanauplius — n. [Gr. meta, after; nauplios, shellfish] (ARTHROPODA: Crustacea) One to several larval stages subsequent to the first (nauplius) larva; characterized by increasing size and the appearance of additional appendages …   Dictionary of invertebrate zoology

  • metanauplius — meta·nauplius …   English syllables

  • metanauplius — | ̷ ̷ ̷ ̷ at meta + noun Etymology: New Latin, from meta + nauplius : a crustacean larva of the stage after the nauplius that has about seven pairs of appendages …   Useful english dictionary

  • Метанауплиус — (metanauplius) стадии развития низших ракообразных, в которую переходит науплиус (см.) после того, как он получил зачатки следующих за 3 ей парой (т. е. за мандибулами) конечностей. В этой же стадии происходит обыкновенно закладка панциря и… …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

  • nauplius — Characteristic crustacean larval stage bearing median simple (naupliar) eye and 3 pairs of setose, functional appendages destined to become the antennules, antennae and mandibles [Brusca and Brusca, 2002]. Early larval stage having only… …   Crustacea glossary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”