A family of graptolites (order Graptoloidea), ‘dichograptid’ being the name given to a fauna of graptoloids occurring in the early Ordovician.
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。