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Journal of Experimental Biology 138,107-132 (1988)
Published by Company of Biologists 1988

Phylogenetic Plasticity of Crustacean Stomatogastric Circuits : I. Pyloric Patterns and Pyloric Circuit of the Shrimp Palaemon Serratus

PIERRE MEYRAND ¹ and MAURICE MOULINS ¹

¹ Laboratoire de Neurobiologie et Physiologie Comparées, Université de Bordeaux I and CNRS, Place Peyneau, F-33120 Arcachon, France

Recordings from the muscles of the pyloric chamber of the shrimp Palaemon display a rhythmic pattern which is either monophasic or biphasic, and is different from the triphasic pyloric pattern of large decapods. Identification of the pyloric neurones in the stomatogastric ganglion and study of their synaptic relationships indicate that the pyloric circuit of Palaemon is very similar to the pyloric circuit of large decapods. It is concluded that homologous neuronal circuits in related species, although similar in terms of their ‘wiring diagram’, are able to produce significantly different patterned outputs.

Key words: neuronal circuits, neuronal oscillators, crustacean stomatogastric system

Accepted on March 30, 1988

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