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Related Experiment Videos

Spatial vision in the echinoid genus Echinometra.

Erin Blevins1, Sönke Johnsen

  • 1Biology Department, Box 90338, Duke University, Durham, NC 27708, USA.

The Journal of Experimental Biology
|November 9, 2004
PubMed
Summary

Sea urchins (Echinometra) possess spatial vision, enabling them to navigate towards targets. Their spines likely aid in focusing light for this remarkable visual ability.

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Area of Science:

  • Marine Biology
  • Animal Behavior
  • Sensory Ecology

Background:

  • Eyes are typically considered essential for image resolution.
  • Diffuse photoreceptive systems with directional sensitivity are less understood for visual capabilities.

Purpose of the Study:

  • To investigate spatial vision in the echinoid genus Echinometra.
  • To determine if echinoids can visually locate and move towards targets.

Main Methods:

  • Two species of Echinometra were subjected to tests assessing their ability to orient towards visual targets.
  • Target sizes varied to determine the resolution limits of their visual system.

Main Results:

  • Echinoids demonstrated significant orientation towards a target with a 33-degree angular width (0.3 steradians).
  • No significant orientation was observed for targets with 26-degree and 16-degree angular widths.
  • The echinoid spines are hypothesized to function by blocking off-angle light, facilitating resolution.

Conclusions:

  • This study presents the first evidence of spatial vision in an echinoderm.
  • The findings suggest that echinoids utilize a unique system for spatial awareness, likely involving their spines.
  • Spatial vision is evolutionarily advantageous for Echinometra, aiding their navigation to and from dark shelters.

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