甘肃永昌乌拉尔世 Sphenopteris(楔羊齿)新记录: 兼论晚古生代 Sphenopteris多样性及古地理演化*

甘肃永昌乌拉尔世 Sphenopteris(楔羊齿)新记录: 兼论晚古生代 Sphenopteris多样性及古地理演化^*

王雪莲¹, 熊聪慧², 孙柏年²

New records of Sphenopteris from the Cisuralian of Yongchang,Gansu Province,with a discussion on diversity and palaeogeographic evolution of this genus during the Late Paleozoic

WANG Xuelian¹, XIONG Conghui², SUN Bainian²

甘肃永昌乌拉尔世 Sphenopteris yongchangensis sp. nov.形态特征 a,b,g—末二次羽片的形态,其中b为a中黄色方框的局部放大,标本编号GSYC-LDGSW-2018-104(A,B);c,d—标本编号GSYC-LDGSW-2018-164(A,B);e,f—平行排列的末次羽片形态,标本编号GSYC-LDGSW-2017-100(A,B);h-m—小羽片形态,标本编号GSYC-LDGSW-2017-100(A,B)