Morphology of the Gastric Mill of Nyctiphanes australis(Euphausiacea, Crustacea)

  • SUH Hae-Lip (Department of Oceanography, Chonnam National University)
  • Published : 1989.08.01

Abstract

SEM observation revealed that the gastric mill of Nyctiphanes australis consists of paired cluster spines and paired lateral teeth, while the filter-press is absent. The morphology of the gastric mill was extremely constant; the numbers of both setiform processes of cluster spines and serrated spines of lateral teeth increased with increasing body length. The cluster spines of N. australis consisted of a single row of stout setiform processes but the lateral teeth comprised a large projection with small serrated spines. The cluster spines are symmetrical in setiform process distribution, however, the lateral teeth are asymmetrical in number of serrated spines.

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