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Phylogenetic analysis suggests that the batrachian divergence occurred in the Middle Permian, rather than the late Carboniferous as recently estimated using molecular clocks18, 22, but the divergence with caecilians corresponds to the deep split between temnospondyls and lepospondyls, which is congruent with the molecular estimates.
谱系分析认为蛙形两栖类的分歧应发生于二叠纪中期，而不是石炭纪末。然而，与离片椎类和壳椎类这一意义深远的分歧密切相关的事件——蛙形两栖类与无足目的分歧的时间却与分子钟所估计的相符。
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Frogs and toads, salamanders and newts, wormlike (and little-known) caecilians—these are the class Amphibia: cold-blooded, creeping, hopping, burrowing creatures of fairy tale, biblical plague, proverb, and witchcraft.
的蚓螈，这些都属于两栖动物纲，牠们冷血、爬行、跳跃，是童话故事里的洞穴生物、圣经里的灾祸，常见于俗谚与巫术里。
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Except one lungless species -''Typhlonectes eiselti'', only known from one specimen collected somewhere in South America - all Caecilians have
除了在南非发现的''Typhlonectes eiselti''没有肺之外，所有无足目的生物都有肺，但是他们同时也使用皮肤与口进行氧气的吸收。
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Most caecilians live underground in damp places.
大部分蚓螈生活在潮湿的地底下。
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Caecilians are found in most of the tropic areas of South-East Asia, Africa and South America, except the dry areas and the high mountains.
蚓螈分布在除了干旱地区和高原外的绝大部分的东南亚、非洲和南美的热带地区。
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Caecilians：蚓螈
Amphibians 两栖动物 | Caecilians 蚓螈 | Salamanders 蝾螈