Nine genera and twenty-two species of heptageniid mayflies from Thailand are defined in this present work as well as one suggested further subgenus, Compsoneuria (Siamoneuria) kovaci (species "incertae sedis") including some particular characters. Taxonomic remarks, diagnoses, line drawings of key characters, distribution, habitat and biological data, and a larval key to the genera and species ...

Genetic studies have highlighted cryptic diversity in many well-known taxa including aquatic insects, with the general implication that there are more species than are currently recognised. Baetis rhodani Pictet are among the most widespread, abundant and ecologically important of all European mayflies (Ephemeroptera), and used widely as biological indicators of stream quality. Traditional taxo...

The South American genus Massartella Lestage, 1930 is composed of five species. Massartella alegrettae Ulmer, 1943 is the only species with the nymph unknown. In this paper, we describe the nymph of M. alegrettae based on specimens from the state of São Paulo, Brazil. This is the first record of the species from southeastern Brazil. The nymph can be easily recognized by the gills present on seg...

Neonicotinoid insecticides like thiacloprid enter agricultural surface waters, where they may affect predator-prey-interactions, which are of central importance for ecosystems as well as the functions these systems provide. The effects of field relevant thiacloprid concentrations on the leaf consumption of Gammarus fossarum (Amphipoda) were assessed over 96 h (n = 13-17) in conjunction with its...

Adjacent food webs may be linked by cross-boundary subsidies: more-productive donor systems can subsidize consumers in less-productive neighboring recipient systems. Introduced species are known to have direct effects on organisms within invaded communities. However, few studies have addressed the indirect effects of nonnative species in donor systems on organisms in recipient systems. We studi...

A new species of the psammophilous and brushlegged North American genus Amercaenis Provonsha and McCafferty, Amercaenis cusabo Provonsha and McCafferty, new species, is described from larvae taken from the Black River (North Carolina), the Pee Dee River (North Carolina), and the Savannah River (Georgia and South Carolina). The new species differs from the only other known species of the genus, ...

A new subgenus and new species, Nousia (Araucophlebia) latifolia subgen. et sp.n., are described from the Maule and Araucania regions in Chile, based on male and female imagos reared from larvae. This species has unusual shapes of larval tergalii, male imaginal genitalia and flat eggs.

Royal Belum State Park is one of the oldest, protected and pristine land masses that joins hundreds small tributaries feed Lake Temenggor. A scientific expedition was conducted, diversity aquatic insects studied. Five rivers namely Sungai Ta Ng, Papan, Gen, Ruok Rambutan were chosen. kick-sampling technique deployed to collect insect larvae. The study recorded a total 42 families 61 genera whic...

The genus Lumahyphes Molineri, 2004 (Ephemeroptera: Leptohyphidae) currently is comprised of three species. Lumahyphes cocal sp. nov. is described based on material from the state of Roraima in northern Brazil. The new species differs from the other described species by having the following combination of characteristics: greyish wing membrane; terga base color whitish and terga I-III & VIII-X ...

Partial mitochondrial COI sequences (barcoding fragment) were explored for the understanding of the species boundaries of Baetis vernus group taxa (Ephemeroptera, Baetidae) in northern Europe. We sampled all species of this group occurring in Finland, but focused on taxa for which morphological and taxonomical confusion have been most apparent. The sequence matrix comprised 627 nucleotides for ...