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ABSTRACT Development of the stomach, with emphasis on the filter system, was investigated in the metanauplius, calyptopis, and furcilia stages of the Antarctic krill Euphausia superba. The metanauplius lacks an elaborated stomach as well as a connection between the esophagus and the midgut. In calyptopis I, the stomach becomes functional. The armature of the cardiac stomach consists of basic components such as lateral and ventral projections and stout spines, but not a primary filter. The latter develops before molt beneath the cuticle and is seen in the exuvial space of calyptopis II. With molting to calyptopis III, the primary filter is elaborated and becomes capable of sorting food particles and of separating a dorsal food from a ventral filtration channel. Although in furcilia IV the spacing of spines in the primary filter is nearly identical to that in the adult specimens, the filter spines in calyptopis III are more widely separated. In all larval stages examined (except furcilia IV), the development of the pyloric stomach is delayed with respect to that of the cardiac stomach. Residues of a pyloric secondary filter system were not found in developing stages of Euphausia superba.

Affiliations: 1: Zoologisches Institut I (Morphologie/Okologie), Universitat Heidelberg, Im Neuenheimer Feld 230, D-6900 Heidelberg, Germany.


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