Siphlonuridae, also known as the primitive minnow mayfly is a family of insects belonging to the order Ephemeroptera.

They are adapted to cool waters.

[2] The family is divided into the following extant genera:[3] The following extinct genera are members of the family Siphlonuridae:[4] 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.

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