unciferous

例句：

1. 1.The spider is an example of an invertebrate, which means it has no backbone.
   蜘蛛是一种无脊椎动物，意味着它没有脊柱。
2. 2. Many insects are unciferous, meaning they do not have a backbone.
   许多昆虫是无脊椎的，这意味着它们没有脊柱。
3. 3.The discovery of new species of unciferous animals has sparked interest in evolutionary biology.
   发现新的无脊椎动物物种引发了对进化生物学的兴趣。