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The nauplius is also the stage at which a simple, unpaired eye is present. The eye is known for that reason as the "naupliar eye", and is often absent in later developmental stages, although it is retained into the adult form in some groups, such as the Notostraca. [3] [4] Some crustacean groups lack this larval type, isopods being one example. [5]
[8] [9] [10] A nauplius eye is completely absent. [11] After mating, mystacocarids lay tiny eggs which hatch into a nauplius or metanauplius larva. [ 4 ] Like the adults, the larvae are benthic.
Asteriscus aquaticus is a species of flowering plant. [2] The flower is part of the so-called "Asteriscus alliance".[3]Formally known by its basionym, Bupthalmum aquaticum, when it was originally described in 1753 as a species of the Buphthalmum genus. [4]
This has three pairs of appendages, all emerging from the young animal's head, and a single naupliar eye. In most groups, there are further larval stages, including the zoea (pl. zoeæ or zoeas [34]). This name was given to it when naturalists believed it to be a separate species. [35] It follows the nauplius stage and precedes the post-larva.
A fertilised egg hatches into a nauplius: a one-eyed larva comprising a head and a telson with three pairs of limbs, lacking a thorax or abdomen. This undergoes six moults, passing through five instars , before transforming into the cyprid stage.
Podocopid ostracods have just a naupliar eye consisting of two lateral ocelli and a single ventral ocellus, but the ventral one is absent in some species. [17] [25] [26] Platycopida was assumed to be completely eyeless, but two species, Keijcyoidea infralittoralis and Cytherella sordida, have been found to both possess a nauplius eye too. [27]
Nauplius (larva), a life stage of crustaceans; Nauplius, a genus in the family Asteraceae; Nauplius, a genus of copepods, considered synonymous with Cyclops; Nauplius, a genus of shrimp, considered synonymous with Alpheus; Nauplius, an academic journal covering carcinology
The nauplius moults five or six times, before emerging as a "copepodid larva". This stage resembles the adult, but has a simple, unsegmented abdomen and only three pairs of thoracic limbs. After a further five moults, the copepod takes on the adult form.