Some mayfly nymphs resemble aquatic thysanurans. One of the most famous English mayflies is "Rhithrogena germanica", the fisherman's "March brown mayfly". Mayfly nymphs may serve as hosts for parasites such as nematodes and trematodes. The larva of some South African species are known to be phoretic on mayfly nymphs. Modern mayfly nymphs do not acquire gills until after their first moult. Smaller saugers generally feed on benthic invertebrates, mayfly larvae, and catfish during spring and summer. Fish that feed on mayfly nymphs that have bioaccumulated heavy metals are themselves at risk. The nymph is the dominant life history stage of the mayfly. Animals can be ephemeral, with brine shrimp and the mayfly being examples. The lifespan of an adult mayfly is very short, varying with the species. The briefness of Gilgamesh's life is compared to that of the adult mayfly. Cloeon dipterum is a species of mayfly with a Holarctic distribution. In 2017, Sinead Morrisey recounts one of Bland's flights in her poem The Mayfly. Code Orange Kids released the EP "Cycles" through Mayfly Records in 2011. Douglas Florian's 1998 poem, "The Mayfly".