noun🔗Share合弓纲基干类群， 盘龙目 (historically used, though outdated) Any of a group of basal or primitive Late Paleozoic synapsid amniotes, part of a polyphyletic grade, formerly regarded as order Pelycosauria."While not technically dinosaurs, the sail-backed Dimetrodon is a well-known example of a pelycosaur. "虽然严格来说，帆背龙(Dimetrodon) 并不是恐龙，但它是**合弓纲基干类群（过去常被称为“盘龙目”）**一个广为人知的例子。biologyanimalorganismsciencehistoryChat with AIVocabulary GamePractice Reading
