Anapsid ‘stem reptiles’ which appeared in the Carboniferous, having diverged from labyrinthodont amphibians. They flourished in the remainder of the Palaeozoic, but rapidly dwindled to extinction in the Triassic.
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。