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MORPHOLOGY OF THE GASTRIC MILL OF THE GENUS THYSANOPODA (EUPHAUSIACEA)

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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.

10.2307/1548337
/content/journals/10.2307/1548337
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10
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/content/journals/10.2307/1548337
2017-12-13

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