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Pedal function in nassariid gastropods: crawling and burrowing inCyclope neritea

Authors
Journal
Journal of Experimental Marine Biology and Ecology
0022-0981
Publisher
Elsevier
Publication Date
Volume
157
Issue
2
Identifiers
DOI: 10.1016/0022-0981(92)90163-5
Keywords
  • Burrowing
  • Crawling
  • Cyclope Neritea
  • Gastropod

Abstract

Abstract Observations were made of the movements of Cyclope neritea crawling over and burrowing into sand of very sheltered bays on the west coast of France and in a laboratory. Crawling was carried out with a smooth gliding motion. In the absence of cilia on the sole of the foot, pedal waves presumably occur but these were too small to observe visually. When burrowing, a muscular stepping motion, similar to that seen in other burrowing gastropods, was employed, increasing the forces available for burial. The rate of burrowing of Cyclope was slower than that of species of Bullia, in keeping with their respective sheltered and high energy beach environments. Cyclope has flattened, disc-shaped foot in which the pedal sinus has developed to a condition intermediate between surface crawling nassariids and the powerfully burrowing Bullia digitalis. Determination of the burrowing rate index (0.73) and the weight specific energy requirement for burrowing (3.9 J · kg 1) in C. neritea indicate that this snail is a fairly rapid burrower, at a lower energy cost that in B. digitalis. This is probably associated with shallow burial.

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