Spiny crawler is what the Hendrickson mayfly (Ephemerella subvaria) nymph is called.
Specifically, the nymph is the immature developmental stage of the mayfly. It is what hatches out of the eggs laid by the female after mating with the male Hendrickson mayfly. It looks like a developing, smaller version of the mature Hendrickson mayfly.
Swimming Mayfly Nymphs (also called naiads) fall under the order Ephemeroptera and the family Baetidae or Leptophlebidae.
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Mayfly largely feed on algae, fungi and decaying plant materials and then digest what they can and pass out waste
most types of mayfly nymphs are omnivorous but some types can be either herbivores or carnivores as well
Mayfly nymphs typically have two or three "tails" in the form of filamentous structures at the end of their abdomen. These tails are called cerci and may also include a central filament known as a median caudal filament.
Mayfly larvae are preyed upon by a variety of animals, including fish species such as trout, bass, and panfish, as well as aquatic insects like dragonfly nymphs and diving beetles. Additionally, some birds and amphibians also feed on mayfly larvae as part of their diet.
Larvae means its wingless, or its the feeding stage for when an insect has completed metamorphisis, an animal in analogous immature form, the young of any invertabrate
nymphs
flock
They are called naiads.
They're called nymphs!