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The morphology of the chemosensory aesthetasc-like setae used during settlement of cypris larvae in the parasitic barnacle Sacculina carcini (Cirripedia : Rhizocephala)

Pasternak, Z; Garm, Anders LU and Hoeg, J T (2005) In Marine Biology 146(5). p.1005-1013
Abstract
Rhizocephalans of the suborder Kentrogonida are parasitic barnacles whose female cypris larvae must locate a suitable host organism (a decapod crustacean), while the male cypris larvae must find a host containing a virgin female. Some of the sensory structures assumed to be involved in this behaviour are the aesthetasc-like setae found on antennules of the cyprids, of which the females possess one and the males two. To verify the aesthetasc nature of these setae we examined their morphology and innervation in the cyprids of the "model" kentrogonid rhizocephalan, Sacculina carcini, using SEM and TEM. No structural differences were found between the two types of aesthetasc-like setae, and their ultrastructure strongly indicates them as being... (More)
Rhizocephalans of the suborder Kentrogonida are parasitic barnacles whose female cypris larvae must locate a suitable host organism (a decapod crustacean), while the male cypris larvae must find a host containing a virgin female. Some of the sensory structures assumed to be involved in this behaviour are the aesthetasc-like setae found on antennules of the cyprids, of which the females possess one and the males two. To verify the aesthetasc nature of these setae we examined their morphology and innervation in the cyprids of the "model" kentrogonid rhizocephalan, Sacculina carcini, using SEM and TEM. No structural differences were found between the two types of aesthetasc-like setae, and their ultrastructure strongly indicates them as being aesthetascs. They have an exceedingly delicate cuticle, 20-50 nm thick, and the lumen contained essentially only very fine ciliary branches of which many were in close contact with the cuticle. No sheath cells were seen in the setal lumen. The ciliary branches could be traced back through the fourth and third antennular segment. The bodies of the sensory cells were not located, but morphological evidence suggests that their inner dendritic segments are located in the second antennular segment, giving rise to cilia that evolve into sheath-wrapped ciliary bundles. All these characteristics support their role as aesthetascs and olfactory organs, while the absence of these traits in the so-called terminal aesthetasc invalidates its previous description as an aesthetasc altogether, although it may still be a chemosensory seta. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Marine Biology
volume
146
issue
5
pages
1005 - 1013
publisher
Springer
external identifiers
  • wos:000228233100019
  • scopus:17444368323
ISSN
0025-3162
DOI
10.1007/s00227-004-1494-4
language
English
LU publication?
yes
id
93073986-6235-460b-93d8-38c10c4d079b (old id 246624)
date added to LUP
2007-10-05 11:53:21
date last changed
2017-07-02 04:27:37
@article{93073986-6235-460b-93d8-38c10c4d079b,
  abstract     = {Rhizocephalans of the suborder Kentrogonida are parasitic barnacles whose female cypris larvae must locate a suitable host organism (a decapod crustacean), while the male cypris larvae must find a host containing a virgin female. Some of the sensory structures assumed to be involved in this behaviour are the aesthetasc-like setae found on antennules of the cyprids, of which the females possess one and the males two. To verify the aesthetasc nature of these setae we examined their morphology and innervation in the cyprids of the "model" kentrogonid rhizocephalan, Sacculina carcini, using SEM and TEM. No structural differences were found between the two types of aesthetasc-like setae, and their ultrastructure strongly indicates them as being aesthetascs. They have an exceedingly delicate cuticle, 20-50 nm thick, and the lumen contained essentially only very fine ciliary branches of which many were in close contact with the cuticle. No sheath cells were seen in the setal lumen. The ciliary branches could be traced back through the fourth and third antennular segment. The bodies of the sensory cells were not located, but morphological evidence suggests that their inner dendritic segments are located in the second antennular segment, giving rise to cilia that evolve into sheath-wrapped ciliary bundles. All these characteristics support their role as aesthetascs and olfactory organs, while the absence of these traits in the so-called terminal aesthetasc invalidates its previous description as an aesthetasc altogether, although it may still be a chemosensory seta.},
  author       = {Pasternak, Z and Garm, Anders and Hoeg, J T},
  issn         = {0025-3162},
  language     = {eng},
  number       = {5},
  pages        = {1005--1013},
  publisher    = {Springer},
  series       = {Marine Biology},
  title        = {The morphology of the chemosensory aesthetasc-like setae used during settlement of cypris larvae in the parasitic barnacle Sacculina carcini (Cirripedia : Rhizocephala)},
  url          = {http://dx.doi.org/10.1007/s00227-004-1494-4},
  volume       = {146},
  year         = {2005},
}