Nauplius eye

from Wikipedia, the free encyclopedia
Nauplius eye of Triops , a representative of the gill pods

The nauplius eye or median eye is the characteristic feature of the nauplius larva , the apomorphic stage of development of the crustaceans . It is an unpaired (simply existing) eye ( ocellus ), which consists of three pigment cup cells and is located centrally ( median ) on the forehead (prostomium). It emerged in the course of the phylogenetic development from the merging of the four median eyes originally present in the Euarthropods (arthropods).

In adult copepods (Copepoda) and most mussel crabs (Ostracoda), the nauplius eye is the only eye. Median eyes also occur in the adults of springtails , rock jumpers and a species of fish ( Tricholepidion gertschi ).

swell

  • R. Wehner, W. Gehring: Zoology. 24., completely revised. Edition. Georg Thieme Verlag, New York 2007, ISBN 978-3-13-367424-9 .
  • H.-E. Gruner (ed.): Textbook of special zoology. Volume 1: Invertebrates. 4th part: Arthropoda (without Insecta). 4., completely reworked. u. strong adult Edition. Gustav Fischer Verlag, Jena / Stuttgart / New York 1993, ISBN 3-334-60404-7 .