Evolution of Eye Reduction and Loss in Trilobites and Some Related Fossil Arthropods
作者: Brigitte Schoenemann
刊名: Emerging Science Journal, 2018, Vol.2 (5)
来源数据库: Ital Publication
DOI: 10.28991/esj-2018-01151
关键词: BlindnessEye ReductionCompound EyeEyeVisionEnergy Costs Of VisionEvolutionBiodiversificationAdaptationEcological NichePlanktonDeep SeaMiniaturizationOpticsPalaeozoicTrilobiteCrustaceanArthropodInvertebratePlankton
原始语种摘要: The fossil record of arthropod compound eyes reflects different modes and occasions of eye reduction and blindness. In the best-studied fossil examples, the trilobites [trilobites: extinct arthropods, dominant during the Palaeozoic], which have an excellent geological record, eyes are primary structures, and in all known genera which lack them, eye-loss is always secondary. Once the eyes were lost, they never were never re-established. The most striking examples occur in the Upper Devonian, when two unrelated major groups of trilobites, with different kinds of eyes, underwent eye reduction and even total loss of the eyes over the same time period, undoubtedly due to long-term environmental change. One reason is that a mud blanket spread over a vast area, there was no firm substrate, and...
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  • trilobite 三叶虫
  • Cambrian 寒武纪的
  • fossil 化石
  • extinct 熄灭的
  • Palaeozoic 古生代的
  • Devonian 德文郡的
  • possess 拥有
  • Ordovician 奥陶纪的
  • undoubtedly 无疑
  • enlarged 放大的