The earliest stage recognized in larval trilobite (Trilobita) development. The larva is small, often spiny, and grows through successive moult stages. Initially it is a small disc but size and segmentation increase with each successive moult.
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。