大部分在古生代岩层中发现的化石都是没有脊骨的无脊椎动物，例如珊瑚、软体动物和三叶虫。
Most of the fossils seen in Paleozoic rocks are invertebrate animals lacking backbones, such as corals, mollusks and trilobites.
其余部分落入无脊椎动物嘴中：脉动式水母、刺虾、珊瑚虫群、海底的爬行动物和潜在泥中的动物。
The rest falls to the invertebrates: pulsing jelly fish, darting shrimp, fixed colonies5 of coral polyps, and crawlers and diggers of the floor.
在南非勘察某自然保护区的一个科学家小组，发现了以前从未有记录的十八个无脊椎动物物种，其中包括有蜘蛛、蜗牛、千足虫、蚯蚓以及蜈蚣。
Scientists surveying a nature reserve in South Africa have discovered 18 previously unrecorded species of invertebrates, including spiders, snails, millipedes, earthworms and centipedes.
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