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Comparative foregut functional morphology of three co-occurring mysids (Crustacea: Mysidacea) from south-eastern Tasmania

Published online by Cambridge University Press:  11 May 2009

Ephrime B. Metillo  and
David A. Ritz
Ephrime B. Metillo
Affiliation:
Department of Zoology, University of Tasmania, Box 252C, GPO, Hobart, Tasmania 7001, Australia
David A. Ritz*
Affiliation:
Department of Zoology, University of Tasmania, Box 252C, GPO, Hobart, Tasmania 7001, Australia
*
Corresponding author
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Abstract

Studies of mysid diets by gut contents analysis have generally revealed a broadly omnivorous feeding habit, but there are also tendencies towards carnivory, herbivory and/or detritivory (e.g. Nath & Pillai, 1973; Siegfried & Kopache, 1980; Mauchline, 1980; Zagursky & Feller, 1985; Wooldridge & Bailey, 1982; Webb & Wooldridge, 1989). Examination of feeding structures is also necessary to support inferences about feeding ecology (e.g. Webb & Wooldridge, 1989). However, there have been few studies relating to the functional morphology of mysid foreguts (Gelderd, 1909; Haffer, 1965; Nath & Pillai, 1973; Mauchline, 1980; Friesen et al., 1986; Webb & Wooldridge, 1989; Storch, 1989). With the exception of the latter two studies, qualitative descriptions and characterization of the different internal foregut structures have been primarily based on light microscopy. These studies may misinterpret the internal arrangement, topography, and three-dimensional orientation of the internal armature of the foregut, mainly due to problems with depth of field (Grice & Lawson, 1971). Oshel & Steele (1988), from SEM observations, briefly described some foregut features of Gnathophausia ingens. In a comparative study, Storch (1989), using the techniques of transmission and scanning electron microscopy, described in detail the different food chambers and channels, cuticular ridges, and ultrastructure of the epithelial and cuticular linings of the mysid foregut. Webb & Wooldridge (1989) noted the strong relationship between mouthparts, foregut morphology, and the feeding habits of two co-occurring mysids.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 74 , Issue 2 , May 1994 , pp. 323 - 336
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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