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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Olenid trilobites: The oldest known chemoautotrophic symbionts ?
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Olenid trilobites: The oldest known chemoautotrophic symbionts ?

机译：油橄榄三叶虫：最古老的化学自养共生体？

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摘要

Late Cambrian to early Ordovician trilobites. the family Olenidae. were tolerant of oxygen-poor. sulfur-rich sea floor conditions, and a case is made that they were chemoautotrophic symbionts. Olenids were uniquely adapted to this habitat in the Lower Paleozoic, which was widespread in the Late Cambrian over Scan- dinavia. This life habit explains distinctive aspects of olenid mor- phology: wide thoraces and large numbers of thoracic segments, thin cuticle and, in some species, degenerate hypostome, and the occasional development of brood pouches. Geochemical and field evidence is consistent with this interpretation. Olenids occupied their specialized habitat for 60 million years until their extinction at the end of the Ordovician.
机译：寒武纪晚期至奥陶纪早期三叶虫。家庭O科。耐缺氧。富含硫的海床条件，并证明它们是化学自养共生体。蛇形目特别适应了下古生界的这种生境，该生境在斯堪的纳维亚的寒武纪晚期广泛分布。这种生活习惯解释了油性形态学的独特方面：宽阔的胸骨和大量的胸段，表皮薄，在某些物种中退化了下垂，偶尔出现了巢袋。地球化学和野外证据与这种解释是一致的。奥兰尼德人占据了其特殊的栖息地6000万年，直到奥陶纪末期灭绝。

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