“Oligochaeta”的概念、定义、翻译、参考文献-科学参考

Oligochaeta

Biology

In traditional classifications, a class of hermaphrodite annelid worms that bear only a few bristles (chaetae). Oligochaetes are very abundant in freshwater and terrestrial habitats. The most familiar members of the class are the earthworm (Lumbricus) and the freshwater bloodworm (Tubifex). Molecular studies have revealed that the evolutionary relationships of annelids are more complex than traditional classifications would suggest, and many members of the Oligochaeta are now placed in the clade Sedentaria, along with some polychaetes and the leeches. See annelida.

Geology and Earth Sciences

Class of annelid worms which possess very well-developed metameric segmentation. The segments have bristles, but parapodia (movable, paired lateral appendages) are not present. They are all hermaphrodites; asexual reproduction is predominant in aquatic forms. Eyes and tentacles are absent. A few marine forms occur but most are freshwater or terrestrial. There are fifteen families, and the class is first recorded from the Upper Ordovician.

单词	Oligochaeta
释义	Oligochaeta Biology In traditional classifications, a class of hermaphrodite annelid worms that bear only a few bristles (chaetae). Oligochaetes are very abundant in freshwater and terrestrial habitats. The most familiar members of the class are the earthworm (Lumbricus) and the freshwater bloodworm (Tubifex). Molecular studies have revealed that the evolutionary relationships of annelids are more complex than traditional classifications would suggest, and many members of the Oligochaeta are now placed in the clade Sedentaria, along with some polychaetes and the leeches. See annelida. Geology and Earth Sciences Class of annelid worms which possess very well-developed metameric segmentation. The segments have bristles, but parapodia (movable, paired lateral appendages) are not present. They are all hermaphrodites; asexual reproduction is predominant in aquatic forms. Eyes and tentacles are absent. A few marine forms occur but most are freshwater or terrestrial. There are fifteen families, and the class is first recorded from the Upper Ordovician.
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