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image of Journal of Crustacean Biology

ABSTRACT The gastric mill structure has been related to utilization of food resources and to phylogenetic relationships in euphausiids. Although the possibility that species in the same genus have a gastric mill with similar morphology has been reported, it is still unclear whether this similarity is present in all species of euphausiids. Therefore, I have examined detailed morphology of the gastric mills in 8 species of Thysanopoda. The well-developed gastric mill of this genus comprises a pair of cluster spines and a pair of lateral teeth. The filter press present in Bentheuphausia amblyops is absent in all species of Thysanopoda. Comparison of the species of Thysanopoda indicated 2 different arrangements of the gastric mill with respect to presence or absence of lateral teeth. One is the well-developed gastric mill of T. cornuta, T. cristata, T. egregia, T. obtusifrons, T. spinicaudata, and T. tricuspidata; the other is the gastric mill without lateral teeth of T. acutifrons and T. aequalis. I report here that the gastric mill in Thysanopoda is diverse in morphology. On the basis of the gastric mill morphology, phylogenetic relationships of euphausiid genera are discussed.


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