In this study, Orbilia dorsalia and its anamorph are described. O. dorsalia is characterized by having an ellipsoid-shaped spore body in the subulate ascospores. Its anamorph produces fusoid conidia with 5-9 septa without trapping structure formation with the challenge of nematodes. Therefore it assigns in Dactylella and is named D. dorsalia. The analysis of ribosomal DNA ITS sequences of morphologically similar species (including teleomorphs and anamorphs) and representative species of Dactylella genus also support the establishment of the new species. Fortunately, the apothecia were formed on the cultures of D. dorsalia with nematode addition.