Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Patello-tibial suture: A particular suture in the tibia of an insect's leg, the presence or absence of which is sometimes used in the identification of Baetidae mayflies.
These other words reference the same concept: patella-tibial suture, patello-tibial sutures, patella-tibial sutures.
The letters "pts" designate the patello-tibial suture in zoomed-in view (D) of the middle leg (C) of a Turkish Baetidae mayfly. Licensed via Creative Commons and WikiMedia from the following publication: Sroka P, Godunko RJ, Rutschmann S, Angeli KB, Salles FF, Gattolliat J-L (2019) A new species of Bungona in Turkey (Ephemeroptera, Baetidae): an unexpected biogeographic pattern within a pantropical complex of mayflies. Zoosystematics and Evolution 95(1): 1-13.
_figure_3.jpg){kind=link}