A category of traces (see trace fossil) made by animals in the creation of a permanent dwelling structure. The borings of bivalves (Bivalvia) such as Pholas are included in this category.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。