A novel eye in 'eyeless' shrimp from hydrothermal vents of the Mid-Atlantic Ridge.

Abstract:

:Rimicaris exoculata is a shrimp that swarms over high-temperature (350 degrees C) sulphide chimneys at Mid-Atlantic Ridge hydrothermal fields (3,600 m). This shrimp lacks an externally differentiated eye, having instead a pair of large organs within the cephalothorax immediately beneath the dorsal surface of the transparent carapace, connected by large nerve tracts to the supraesophageal ganglion. These organs contain a visual pigment with an absorption spectrum characteristic of rhodopsin. Ultrastructural evidence for degraded rhabdomeral material suggests the presence of photoreceptors. No image-forming optics are associated with the organs. We interpret these organs as being eyes adapted for detection of low-level illumination and suggest that they evolved in response to a source of radiation associated with the environment of hydrothermal vents.

journal_name

Nature

journal_title

Nature

authors

Van Dover CL,Szuts EZ,Chamberlain SC,Cann JR

doi

10.1038/337458a0

subject

Has Abstract

pub_date

1989-02-02 00:00:00

pages

458-60

issue

6206

eissn

0028-0836

issn

1476-4687

journal_volume

337

pub_type

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