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Ultrastructure and functional organization of mouthpart sensory setae of the spiny lobster Panulirus argus: New features of putative mechanoreceptors

Garm, Anders LU and Hoeg, JT (2006) In Journal of Morphology 267(4). p.464-476
Abstract
In comparison with other decapods, the Caribbean spiny lobster Panulirus argus has little diversity in the external morphology of the setae on the mouth apparatus. In mouthpart areas that frequently touch food items only two types of setae can be distinguished: simple setae and cuspidate setae. Simple setae are by far more numerous. The ultrastructural data presented here show that both types of seta are bimodal, in that they both contain mechano- and chemosensory cells as indicated by morphological features. The morphological features divide the sensory cells into three types: type 1, which has a mechanosensory appearance; type 2, which has a chemo-sensory appearance; and type 3, which is believed to be a mechanoreceptor due to desmosomal... (More)
In comparison with other decapods, the Caribbean spiny lobster Panulirus argus has little diversity in the external morphology of the setae on the mouth apparatus. In mouthpart areas that frequently touch food items only two types of setae can be distinguished: simple setae and cuspidate setae. Simple setae are by far more numerous. The ultrastructural data presented here show that both types of seta are bimodal, in that they both contain mechano- and chemosensory cells as indicated by morphological features. The morphological features divide the sensory cells into three types: type 1, which has a mechanosensory appearance; type 2, which has a chemo-sensory appearance; and type 3, which is believed to be a mechanoreceptor due to desmosomal connections to a scolopale. All three cell types were found in all examined setae. In an earlier study the simple setae were found to contain two types of mechanosensors: bend-sensitive cells and displacement-sensitive cells. The morphological arrangement of the outer dendritic segment described in the present study cannot explain this division. Instead, it is suggested that the difference in sensitivity is caused by a differential arrangement of their stretch-sensitive ion channels. This hypothesis also provides an explanation for the earlier observation that only bend cells respond to changes in osmolarity. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
osmosensitivity, ion channels, stretch sensitive, crustacea, bend sensitivity
in
Journal of Morphology
volume
267
issue
4
pages
464 - 476
publisher
John Wiley & Sons
external identifiers
  • pmid:16425272
  • wos:000235944800006
  • scopus:33645531166
ISSN
1097-4687
DOI
10.1002/jmor.10417
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Zoology (Closed 2011) (011012000)
id
6628c997-6cd3-4eed-bf62-ef9a3115c977 (old id 416429)
date added to LUP
2016-04-01 15:52:21
date last changed
2020-01-22 05:29:04
@article{6628c997-6cd3-4eed-bf62-ef9a3115c977,
  abstract     = {In comparison with other decapods, the Caribbean spiny lobster Panulirus argus has little diversity in the external morphology of the setae on the mouth apparatus. In mouthpart areas that frequently touch food items only two types of setae can be distinguished: simple setae and cuspidate setae. Simple setae are by far more numerous. The ultrastructural data presented here show that both types of seta are bimodal, in that they both contain mechano- and chemosensory cells as indicated by morphological features. The morphological features divide the sensory cells into three types: type 1, which has a mechanosensory appearance; type 2, which has a chemo-sensory appearance; and type 3, which is believed to be a mechanoreceptor due to desmosomal connections to a scolopale. All three cell types were found in all examined setae. In an earlier study the simple setae were found to contain two types of mechanosensors: bend-sensitive cells and displacement-sensitive cells. The morphological arrangement of the outer dendritic segment described in the present study cannot explain this division. Instead, it is suggested that the difference in sensitivity is caused by a differential arrangement of their stretch-sensitive ion channels. This hypothesis also provides an explanation for the earlier observation that only bend cells respond to changes in osmolarity.},
  author       = {Garm, Anders and Hoeg, JT},
  issn         = {1097-4687},
  language     = {eng},
  number       = {4},
  pages        = {464--476},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Morphology},
  title        = {Ultrastructure and functional organization of mouthpart sensory setae of the spiny lobster Panulirus argus: New features of putative mechanoreceptors},
  url          = {http://dx.doi.org/10.1002/jmor.10417},
  doi          = {10.1002/jmor.10417},
  volume       = {267},
  year         = {2006},
}