Advanced

Radiolar eyes of serpulid worms (Annelida, serpulidae) : Structures, function, and phototransduction

Bok, Michael J. LU ; Porter, Megan L.; Ten Hove, Harry A.; Smith, Richard and Nilsson, Dan Eric LU (2017) In Biological Bulletin 233(1). p.39-57
Abstract

Fan worms, represented by sabellid and serpulid polychaetes, have an astonishing array of unusual eyes and photoreceptors located on their eponymous feeding appendages. Here we organize the previous descriptions of these eyes in serpulids and report new anatomical, molecular, and physiological data regarding their structure, function, and evolution and the likely identity of their phototransduction machinery. We report that, as in sabellids, serpulids display a broad diversity of radiolar eye arrangements and ocellar structures. Furthermore, the visual pigment expressed in the eyes of Spirobranchus corniculatus, a species of the charismatic Christmas tree worms, absorbs light maximally at 464 nm in wavelength. This visual pigment... (More)

Fan worms, represented by sabellid and serpulid polychaetes, have an astonishing array of unusual eyes and photoreceptors located on their eponymous feeding appendages. Here we organize the previous descriptions of these eyes in serpulids and report new anatomical, molecular, and physiological data regarding their structure, function, and evolution and the likely identity of their phototransduction machinery. We report that, as in sabellids, serpulids display a broad diversity of radiolar eye arrangements and ocellar structures. Furthermore, the visual pigment expressed in the eyes of Spirobranchus corniculatus, a species of the charismatic Christmas tree worms, absorbs light maximally at 464 nm in wavelength. This visual pigment closely matches the spectrum of downwelling irradiance in shallow coral reef habitats and lends support to the hypothesis that these radiolar photoreceptors function as a silhouette-detecting “burglar alarm” that triggers a rapid withdrawal response when the worm is threatened by potential predators. Finally,we report on the transcriptomic sequencing results for the radiolar eyes of S. corniculatus, which express invertebrate c-type opsins in their ciliary radiolar photoreceptors, closely related to the opsin found in the radiolar eyes of the sabellid Acromegalomma interruptum.We explore the potential for a shared evolutionary lineage between the radiolar photoreceptors of serpulids and sabellids and consider these unique innovations in the broader context of metazoan eye evolution.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biological Bulletin
volume
233
issue
1
pages
19 pages
publisher
Marine Biological Laboratory
external identifiers
  • scopus:85036501974
ISSN
0006-3185
DOI
10.1086/694735
language
English
LU publication?
yes
id
50fd2ee1-450d-41e0-9211-d0ae082b5bdb
date added to LUP
2018-01-02 11:01:54
date last changed
2018-04-29 04:44:40
@article{50fd2ee1-450d-41e0-9211-d0ae082b5bdb,
  abstract     = {<p>Fan worms, represented by sabellid and serpulid polychaetes, have an astonishing array of unusual eyes and photoreceptors located on their eponymous feeding appendages. Here we organize the previous descriptions of these eyes in serpulids and report new anatomical, molecular, and physiological data regarding their structure, function, and evolution and the likely identity of their phototransduction machinery. We report that, as in sabellids, serpulids display a broad diversity of radiolar eye arrangements and ocellar structures. Furthermore, the visual pigment expressed in the eyes of Spirobranchus corniculatus, a species of the charismatic Christmas tree worms, absorbs light maximally at 464 nm in wavelength. This visual pigment closely matches the spectrum of downwelling irradiance in shallow coral reef habitats and lends support to the hypothesis that these radiolar photoreceptors function as a silhouette-detecting “burglar alarm” that triggers a rapid withdrawal response when the worm is threatened by potential predators. Finally,we report on the transcriptomic sequencing results for the radiolar eyes of S. corniculatus, which express invertebrate c-type opsins in their ciliary radiolar photoreceptors, closely related to the opsin found in the radiolar eyes of the sabellid Acromegalomma interruptum.We explore the potential for a shared evolutionary lineage between the radiolar photoreceptors of serpulids and sabellids and consider these unique innovations in the broader context of metazoan eye evolution.</p>},
  author       = {Bok, Michael J. and Porter, Megan L. and Ten Hove, Harry A. and Smith, Richard and Nilsson, Dan Eric},
  issn         = {0006-3185},
  language     = {eng},
  month        = {08},
  number       = {1},
  pages        = {39--57},
  publisher    = {Marine Biological Laboratory},
  series       = {Biological Bulletin},
  title        = {Radiolar eyes of serpulid worms (Annelida, serpulidae) : Structures, function, and phototransduction},
  url          = {http://dx.doi.org/10.1086/694735},
  volume       = {233},
  year         = {2017},
}