Primitive Minnow Mayflies
These photos supplement pages 49-62 of the Guide to Aquatic Invertebrates of the Upper Midwest. Information on the biology of Siphlonuridae can be found on page 61. Siphlonuridae look similar to Baetidae, but in Siphlonuridae the labrum is not deeply notched and there is a posteriolateral spine on segment 9. Click to compare with Baetidae.