...The other group of Paleozoic Amphibia that has been considered probablyancestral to any modern type is the subclass Lepospondyli, containingthree orders, Aistopoda, Nectridia and Microsauria... 
Theodore H. Eaton 「The Ancestry of Modern Amphibia: A Review of the Evidence」
便利！手書き漢字入力検索
この漢字は何でしょう？？