The first record of Caenis Stephens, 1835 in Australia (Ephemeroptera: Caenidae) with descriptions of two new species

Two species of Caenis with straight forceps with a terminal tuft of spines are described from northern Australia. Male imagoes and nymphs of C. hanleyi n. sp. are described from reared material from the Alligator Rivers Region in the Northern Territory and C. binda n. sp. is described only from male imagoes collected from streams in the Wet Tropics of Queensland. C. hanleyi differs from C. binda by the structure of the forceps with C. binda being longer and narrower with longer apical spines. These are the first records of the genus Caenis in Australia.

Automated summary

This article describes two species of Caenis found in northern Australia, both of which have straight forceps with a terminal tuft of spines. Male imagoes and nymphs of C. hanleyi were collected from the Northern Territory, while C. binda was only described based on male imagoes collected from streams in Queensland's Wet Tropics. C. hanleyi can be distinguished from C. binda by the structure of their forceps, with C. binda having longer and narrower forceps with longer apical spines. These are the first records of the Caenis genus in Australia.