The ratios of the length to width of the propodus of the fourth leg in the three kinds of mitten crabs were identical or near to those of taxonomic samples.
三种绒螯蟹
第四步

长宽比值,与其分类标本吻合或基本吻合。
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学篇
学篇
趣闻 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, 

尼格纳塔·赫斯特是一种会飞的昆虫,那就意味着有翅
——一个包括会飞昆虫的分
群——最早出现在早泥盆纪,即超过4亿年前。
The taxonomist sometimes overlooks whole species in favour of those groups currently under study, while the ecologist often cotlects only a limited number of specimens of each species, thus reducing their value for taxonomic investigations.
分
学家们有时会忽略整个
种而选择当时正在研究的那些
种群,而
态学家常常只收集每个
种有限的几个样本,因此就降低了分
研究的价值。