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Two types of integumental compound sense organs are described in 48 of the 86 known species of euphausiids. The first occurs in the dorsal regions of the abdominal segments, especially the fourth and fifth. They consist of paired rows of short peglike setae that appear to have bifid endings and are thus probably chemoreceptors. The second type is a compound organ present in the median dorsal anterior region of the carapace. It is usually located in the apical region of a keel in front of cervical groove. Its form is different in each species and so it can be used as a diagnostic feature to identify damaged euphausiids and females where the male copulatory organ (petasma) is the principal character used to identify the species. 相似文献
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