Ephemeroptera

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Fig. 150 Ephemeroptera . Ephemera sp.

Ephemeroptera

an order of the class Insecta, containing the mayflies. They are EXOPTERGYOTES, and spend the great majority of their life in the nymphal stage and only a few minutes or hours in the nonfeeding, adult stage.
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December 2009) suggested that these triangular structures may represent abdominal gills of an immature animal, and that the posterior orientation of the legs, the squat stance (with the head, thorax, and abdomen all touching the surface), the presumed abdominal gills, and the elongate shape of the trace are strongly suggestive of ephemeropterans.
In addition, seven species (one pseudoscorpion, one collembolan, one bivalve, one ephemeropteran, and three trichopterans) are removed from the state list; a synthesis of new distributional records are added for two gastropods, one coleopteran, and one amphibian, and changes in nomenclature are provided for three gastropods and two coleopterans.
Kirikulaht, a lagoon closely connected with the bay of Reigi laht, revealed a diverse freshwater fauna dominated by chironomid and ephemeropteran larvae, nematodes, and planktonic cladocerans.
The relative ease with which the range of tolerance values regarding the parameters investigated were obtained suggests that empirically derived tolerance ranges for most Ephemeropteran species can be determined.
Sculpin from 15% embedded streams consumed ephemeropterans and megalopterans.
Abundance of dipteran chironomid larvae, and ephemeropteran tricorythid and baetid larvae in darter diets varied significantly among riffles (Table 1).
The symbiotic relationship of a chironomid with its Ephemeropteran (caps?
04; range, 3 to 29), especially Ephemeropteran, Plecopteran and Trichopteran (EPT) taxa richness (mean = 4.
Ephemeropteran nymphs (mainly Baetidae) were the predominant food items (Table 3) of YOY sturgeon; this insect order and Simulidae were absent from the lake samples (summer and winter).