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The organization of honeybee ocelli: Regional specializations and rhabdom arrangements

Ribi, Willi; Warrant, Eric LU and Zeil, Jochen (2011) In Arthropod Structure & Development 40(6). p.509-520
Abstract
We have re-investigated the organization of ocelli in honeybee workers and drones. Ocellar lenses are divided into a dorsal and a ventral part by a cusp-shaped indentation. The retina is also divided, with a ventral retina looking skywards and a dorsal retina looking at the horizon. The focal plane of lenses lies behind the retina in lateral ocelli, but within the dorsal retina in the median ocellus of both workers and drones. Ventral retinula cells are ca. 25 mu m long with dense screening pigments. Dorsal retinula cells are ca. 60 mu m long with sparse pigmentation mainly restricted to their proximal parts. Pairs of retinula cells form flat, non-twisting rhabdom sheets with elongated, straight, rectangular cross-sections, on average 8.7... (More)
We have re-investigated the organization of ocelli in honeybee workers and drones. Ocellar lenses are divided into a dorsal and a ventral part by a cusp-shaped indentation. The retina is also divided, with a ventral retina looking skywards and a dorsal retina looking at the horizon. The focal plane of lenses lies behind the retina in lateral ocelli, but within the dorsal retina in the median ocellus of both workers and drones. Ventral retinula cells are ca. 25 mu m long with dense screening pigments. Dorsal retinula cells are ca. 60 mu m long with sparse pigmentation mainly restricted to their proximal parts. Pairs of retinula cells form flat, non-twisting rhabdom sheets with elongated, straight, rectangular cross-sections, on average 8.7 mu m long and 1 mu m wide. Honeybee ocellar rhabdoms have shorter and straighter cross-sections than those recently described in the night-active bee Megalopta genalis. Across the retina, rhabdoms form a fan-shaped pattern of orientations. In each ocellus, ventral and dorsal retinula cell axons project into two separate neuropils, converging on few large neurons in the dorsal, and on many small neurons in the ventral neuropil. The divided nature of the ocelli, together with the particular construction and arrangement of rhabdoms, suggest that ocelli are not only involved in attitude control, but might also provide skylight polarization compass information. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Honeybees, Workers, Drones, Ocelli, Rhabdom organization, Polarization, sensitivity
in
Arthropod Structure & Development
volume
40
issue
6
pages
509 - 520
publisher
Elsevier
external identifiers
  • wos:000297426200003
  • scopus:81255187959
ISSN
1467-8039
DOI
10.1016/j.asd.2011.06.004
language
English
LU publication?
yes
id
bd25c50e-1469-4b13-931e-a57ff9a8137d (old id 2272257)
date added to LUP
2011-12-29 12:10:32
date last changed
2017-10-22 04:07:34
@article{bd25c50e-1469-4b13-931e-a57ff9a8137d,
  abstract     = {We have re-investigated the organization of ocelli in honeybee workers and drones. Ocellar lenses are divided into a dorsal and a ventral part by a cusp-shaped indentation. The retina is also divided, with a ventral retina looking skywards and a dorsal retina looking at the horizon. The focal plane of lenses lies behind the retina in lateral ocelli, but within the dorsal retina in the median ocellus of both workers and drones. Ventral retinula cells are ca. 25 mu m long with dense screening pigments. Dorsal retinula cells are ca. 60 mu m long with sparse pigmentation mainly restricted to their proximal parts. Pairs of retinula cells form flat, non-twisting rhabdom sheets with elongated, straight, rectangular cross-sections, on average 8.7 mu m long and 1 mu m wide. Honeybee ocellar rhabdoms have shorter and straighter cross-sections than those recently described in the night-active bee Megalopta genalis. Across the retina, rhabdoms form a fan-shaped pattern of orientations. In each ocellus, ventral and dorsal retinula cell axons project into two separate neuropils, converging on few large neurons in the dorsal, and on many small neurons in the ventral neuropil. The divided nature of the ocelli, together with the particular construction and arrangement of rhabdoms, suggest that ocelli are not only involved in attitude control, but might also provide skylight polarization compass information. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Ribi, Willi and Warrant, Eric and Zeil, Jochen},
  issn         = {1467-8039},
  keyword      = {Honeybees,Workers,Drones,Ocelli,Rhabdom organization,Polarization,sensitivity},
  language     = {eng},
  number       = {6},
  pages        = {509--520},
  publisher    = {Elsevier},
  series       = {Arthropod Structure & Development},
  title        = {The organization of honeybee ocelli: Regional specializations and rhabdom arrangements},
  url          = {http://dx.doi.org/10.1016/j.asd.2011.06.004},
  volume       = {40},
  year         = {2011},
}