Siphlonurus aestivalis

Larva  

  -    . . .

  - Order Ephemeroptera
  - Family Siphlonuridae
  - Genus Siphlonurus
  - Species aestivalis  




Ventral view




Gills 1 and 2 consist of two pairs, gills 4 through 7 are single plated




Process of abdominal segment IX is almost double long then wide