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The functional anatomy of the foregut of porcellana platycheles and a comparison with galathea squamifera and upogebia deltaura crustacea decapoda

, : The functional anatomy of the foregut of porcellana platycheles and a comparison with galathea squamifera and upogebia deltaura crustacea decapoda. Journal of Zoology (London) 203(4): 511-536

Muscles, ossicles and internal structures of the foregut of P. platycheles are described and figured. The function of the foregut is deduced from the distribution of food particle size within its chambers. The trough of the cardio-pyloric valve is considered to be the main site of digestion and the supra-ampullary valve to have an active role in the formation of the ventral cap of fecal pellets. The structures and function of the foregut of G. squamifera are similar to those of P. platycheles. Certain differences found in the foregut of U. deltaura may be related to the small size of food particles ingested and the absence of a ventral cap from fecal pellets may be due to the supra-ampullary valve having no action on surrounding particles.

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