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[3] The sediment in which the nymphs live is rich in organic material, and in polluted environments, heavy metals may accumulate. The nymphs bioaccumulate the toxic metals cadmium, copper, lead and zinc. [4] The males perform a "nuptial dance" [5] which takes place over land, above open areas or single trees, or in the lee of trees in windy ...
The nymphal stage of mayflies may last from several months to several years, depending on species and environmental conditions. [ 5 ] Around half of all mayfly species whose reproductive biology has been described are parthenogenetic (able to asexually reproduce), including both partially and exclusively parthenogenetic populations and species.
Ephemerids are generally quite large mayflies (up to 35 mm) with either two or three very long tails. Many species have distinctively patterned wings. [2] They breed in a wide range of waters, usually requiring a layer of silt as the nymphs have strong legs which are adapted for burrowing (the group is sometimes known as burrowing mayflies).
These three genera belong to the family Baetiscidae: [6] [7] Baetisca Walsh, 1862 i c g b †Balticobaetisca Staniczek & Bechly, 2002 g Baltic amber, Eocene †Protobaetisca Staniczek 2007 Crato Formation, Brazil, Early Cretaceous ()
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They have reduced mouthparts because the adults just emerge to mate and then die shortly after. They have two front wings and two reduced hind wings. Their wings are membranous and heavily veined to add strength since the adults must find one another through flight. The eyes of adult Ephemerellids are large and sit above two setaceous antennae.
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