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Some observations on the internal morphology of Hansen's nauplius Y (Crustacea)

Elofsson, Rolf LU (1971) In Sarsia 46. p.23-40
Abstract
The internal morphology of the crustacean larval form that Hansen (1899) called nauplius y has revealed a remarkably advanced early nauplius. The nervous system is well developed and differentiated. It is connected with the anlagen of the compound eyes. A presumed filamentous base of the SPX-organ connects with these. The nauplius eye is present in a three-partite form with two retinula cells in each cup. The alimentary canal consists of the ectodermal oesophagus with an inner layer of longitudinal muscles and an outer circular layer, and of the endodermal midgut with cells having microvillous borders against the lumen. There is no proctodeum or anus present. There is a well-developed muscular system. The head contains a large gland with a... (More)
The internal morphology of the crustacean larval form that Hansen (1899) called nauplius y has revealed a remarkably advanced early nauplius. The nervous system is well developed and differentiated. It is connected with the anlagen of the compound eyes. A presumed filamentous base of the SPX-organ connects with these. The nauplius eye is present in a three-partite form with two retinula cells in each cup. The alimentary canal consists of the ectodermal oesophagus with an inner layer of longitudinal muscles and an outer circular layer, and of the endodermal midgut with cells having microvillous borders against the lumen. There is no proctodeum or anus present. There is a well-developed muscular system. The head contains a large gland with a paired ventral outlet. A new dorsocaudal organ of doubtful function is described.

The morphological facts presented in this investigation indicate that the nauplius y, as knowledge stands today, is close to the Cirripedia.
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Contribution to journal
publication status
published
subject
in
Sarsia
volume
46
pages
23 - 40
DOI
10.1080/00364827.1971.10411186
language
English
LU publication?
yes
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4c4f3a02-4f9f-4f76-adfe-a2803707f7ac
date added to LUP
2016-12-03 16:08:21
date last changed
2017-04-05 16:19:51
@article{4c4f3a02-4f9f-4f76-adfe-a2803707f7ac,
  abstract     = {The internal morphology of the crustacean larval form that Hansen (1899) called nauplius y has revealed a remarkably advanced early nauplius. The nervous system is well developed and differentiated. It is connected with the anlagen of the compound eyes. A presumed filamentous base of the SPX-organ connects with these. The nauplius eye is present in a three-partite form with two retinula cells in each cup. The alimentary canal consists of the ectodermal oesophagus with an inner layer of longitudinal muscles and an outer circular layer, and of the endodermal midgut with cells having microvillous borders against the lumen. There is no proctodeum or anus present. There is a well-developed muscular system. The head contains a large gland with a paired ventral outlet. A new dorsocaudal organ of doubtful function is described.<br/><br/>The morphological facts presented in this investigation indicate that the nauplius y, as knowledge stands today, is close to the Cirripedia.<br/>},
  author       = {Elofsson, Rolf},
  language     = {eng},
  pages        = {23--40},
  series       = {Sarsia},
  title        = {Some observations on the internal morphology of Hansen's nauplius Y (Crustacea)},
  url          = {http://dx.doi.org/10.1080/00364827.1971.10411186},
  volume       = {46},
  year         = {1971},
}