It is noticed that oleanane triterpenoidal saponins are characteristic constituents of this family and have taxonomic significance.
结果表明齐墩果烷型萜皂甙作为木特征化学成分在该统分类中具有一定意。
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One theory holds that, if Rhyniognatha was a flying insect, that would mean that the pterygotes -- the taxonomic group that includes flying insects -- first came about in the early Devonian, say, more than 400 million years ago.
一种理论认为, 如果鼻颚龙是一种飞行昆,那就意味着翼龙——包括飞行昆在内分群——首先出现于泥盆纪早期,比方说,4 亿多年前。