Species: gracilis JI & PANG, 1999
Etymology: Latin, gracilis, « small and weak » : showing the small skull roof of the new species and its thin dermal bone.
Locality: Qingmen, Zhaotong, Yunnan Province, China.
Horizon: Posongchong Formation.
Age: Early Devonian.
Material: A nearl complete skull roof and its external counterpart.