Which family is recognized for little stout crawler mayflies?

The family recognized for little stout crawler mayflies is Leptohyphidae. This family encompasses a group of mayflies known for their distinct morphology and behavior. Members of Leptohyphidae are typically characterized by their small to medium size and a stout body shape, which aligns with the description of "little stout crawlers."

Mayflies in this family are primarily found in freshwater habitats and are often associated with clean, flowing water. Their nymphs (the immature stage of mayflies) usually exhibit crawling behavior on substrates in aquatic environments, which is reflected in the description of them being "crawlers." They play an important ecological role as they are a source of food for fish and other aquatic organisms.

In contrast, the other families listed do not exhibit the same traits. Ephemeridae includes mayflies typically recognized for their larger size and more elongated bodies. Corixidae, commonly known as water boatmen, are not mayflies but are instead aquatic bugs with a completely different morphology and behavior. Gerridae, or water striders, are also not related to mayflies and are known for their ability to walk on the surface of water, further distinguishing them from the stout crawler mayflies of Leptohyphidae.