opisthobranch

例句：

1. 1.The discovery of new species in this region is a significant contribution to the understanding of the biodiversity of the opisthobranchs.
   在这一地区的新物种发现对了解无脊椎动物的生物多样性具有重要意义。
2. 2. Many species of opisthobranchs are known for their unique coloration and patterns.
   许多无脊椎动物因其独特的颜色和图案而闻名。
3. 3. The opisthobranchs are found in all oceans, from the Arctic to the Antarctic.
   无脊椎动物遍布所有海洋，从北极到南极都有分布。