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Setal morphology and cirral setation of thoracican barnacle cirri: adaptations and implications for thoracican evolution

Chan, B. K. K.; Garm, Anders LU and Hoeg, J. T. (2008) In Journal of Zoology 275(3). p.294-306
Abstract
Thoracic cirripedes are sessile crustaceans that use six pairs of thoracic appendages (the cirri) to catch and handle food. We used scanning electron microscopy to examine the cirri, which include one to three pairs of maxillipeds in six species of thoracican barnacles, in search of correlations between cirral setation and feeding mode. The species studied comprise both pedunculate and sessile forms and represent a wide range of marine habitats as well as morphologies, viz., Ibla cumingi, Octolasmis warwickii, Capitulum mitella, Pollicipes polymerus, Tetraclita japonica japonica and Megabalanus volcano. Of the pedunculates, I. cumingi has the least complex setation pattern consisting of only serrulate types. This is consistent with its... (More)
Thoracic cirripedes are sessile crustaceans that use six pairs of thoracic appendages (the cirri) to catch and handle food. We used scanning electron microscopy to examine the cirri, which include one to three pairs of maxillipeds in six species of thoracican barnacles, in search of correlations between cirral setation and feeding mode. The species studied comprise both pedunculate and sessile forms and represent a wide range of marine habitats as well as morphologies, viz., Ibla cumingi, Octolasmis warwickii, Capitulum mitella, Pollicipes polymerus, Tetraclita japonica japonica and Megabalanus volcano. Of the pedunculates, I. cumingi has the least complex setation pattern consisting of only serrulate types. This is consistent with its very simplified feeding mode and an apparent inability to discriminate between food items. Octolasmis warwickii is slightly more modified, while both P. polymerus and C. mitella have a more diversified setation. The balanomorphan species exhibit by far the most complex cirral setation. This is consistent with the several types of suspension feeding seen in these species, their ability to identify and sort captured food items and even to perform microfiltration in the mantle cavity using the setae on their three pairs of maxillipeds. Our results indicate that in thoracican barnacles, adaptations in feeding behaviour are associated with changes in the setation pattern of the cirri. In addition, the setal types and their distribution on the cirri are potential new characters in future morphology-based analyses of the phylogeny of the Cirripedia Thoracica. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
morphology, functional, scanning electron microscopy, setae, barnacles, cirri, phylogeny, adaptations
in
Journal of Zoology
volume
275
issue
3
pages
294 - 306
publisher
Wiley-Blackwell
external identifiers
  • wos:000257712300011
  • scopus:47349102656
ISSN
0952-8369
DOI
10.1111/j.1469-7998.2008.00441.x
language
English
LU publication?
yes
id
6a7127f7-f849-48e7-bb8a-0fec1592d790 (old id 1253641)
date added to LUP
2008-11-10 12:02:36
date last changed
2017-07-02 03:36:49
@article{6a7127f7-f849-48e7-bb8a-0fec1592d790,
  abstract     = {Thoracic cirripedes are sessile crustaceans that use six pairs of thoracic appendages (the cirri) to catch and handle food. We used scanning electron microscopy to examine the cirri, which include one to three pairs of maxillipeds in six species of thoracican barnacles, in search of correlations between cirral setation and feeding mode. The species studied comprise both pedunculate and sessile forms and represent a wide range of marine habitats as well as morphologies, viz., Ibla cumingi, Octolasmis warwickii, Capitulum mitella, Pollicipes polymerus, Tetraclita japonica japonica and Megabalanus volcano. Of the pedunculates, I. cumingi has the least complex setation pattern consisting of only serrulate types. This is consistent with its very simplified feeding mode and an apparent inability to discriminate between food items. Octolasmis warwickii is slightly more modified, while both P. polymerus and C. mitella have a more diversified setation. The balanomorphan species exhibit by far the most complex cirral setation. This is consistent with the several types of suspension feeding seen in these species, their ability to identify and sort captured food items and even to perform microfiltration in the mantle cavity using the setae on their three pairs of maxillipeds. Our results indicate that in thoracican barnacles, adaptations in feeding behaviour are associated with changes in the setation pattern of the cirri. In addition, the setal types and their distribution on the cirri are potential new characters in future morphology-based analyses of the phylogeny of the Cirripedia Thoracica.},
  author       = {Chan, B. K. K. and Garm, Anders and Hoeg, J. T.},
  issn         = {0952-8369},
  keyword      = {morphology,functional,scanning electron microscopy,setae,barnacles,cirri,phylogeny,adaptations},
  language     = {eng},
  number       = {3},
  pages        = {294--306},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Zoology},
  title        = {Setal morphology and cirral setation of thoracican barnacle cirri: adaptations and implications for thoracican evolution},
  url          = {http://dx.doi.org/10.1111/j.1469-7998.2008.00441.x},
  volume       = {275},
  year         = {2008},
}