Oculephemeridae n. fam., a new mayfly family from mid-Cretaceous Kachin amber (Insecta, Ephemeroptera).

Based on a well-preserved male imago, a new genus and species Oculephemera mazhenxingi n. gen. et n. sp. of Ephemeroptera are presented in this study. For its distinct characters on head, wings, legs and genitalia, especially the autapomorphies of fused turban eyes and three distal segments of forceps, we erect a new family Oculephemeridae n. fam. herein as the sixth ephemeropteran family discovered from Kachin amber. All the distinguishable characters of the new taxa are illustrated and described; detailed comparisons between related families are also given. The new taxa not only represent a unique clade of mayflies but also give us a chance to modify somehypothesess of the origin, evolution and dispersal of several related lineages. [ABSTRACT FROM AUTHOR]