Siphlonuridae

Siphlonuridae, also known as the primitive minnow mayfly is a family of insects belonging to the order Ephemeroptera. They are adapted to cool waters.

Taxonomy
The family is divided into the following extant genera:
 * 1) Ameletoides Tillyard, 1933
 * 2) Edmundsius Day, 1953
 * 3) Parameletus Bengtsson, 1908
 * 4) Siphlonisca Needham, 1909
 * 5) Siphlonurus Eaton, 1868

Family overview
The labrum (upper lip) is not notched in the middle; the antennae are shorter than twice the width of the head; the maxillae on the underside of the head lack prominent rows of golden spines; the abdominal gills are rounded and similar to each other in structure; three long slender filaments at the end of the body are about equally long.