ABSTRACT
During the summer of July to September 2020, a biodiversity survey on Chironomidae of Baishanzu Nature Reserve, China was made. In total, five Stenochironomus taxa/species were discovered, of which two belong to undescribed species and one (S.okialbus Sasa, 1990) is reported for the first time from China. The male adults of two new species are described and illustrated. Stenochironomusannulus Song & Qi sp. nov. is distinguished in having a wing with two dark spots restricted to the fork area of FCu and RM, the mid- and hind-femur each with a brown annulus, and the inferior volsella with two setae and one strong terminal spine. Stenochironomusbaishanzuensis Song & Qi sp. nov. is distinguished by a combination of characters: a single dark spot on the middle part of the wing, fore legs brown to dark brown except for the basal 3/4 of femur, and the inferior volsella with four long setae and one stout terminal spine. The neighbour-joining tree based on public COI barcodes formed distinct clades with clear support for the new species. An updated key to known male adults of Stenochironomus from China is also provided.
ABSTRACT
The male and female adult and larva of Clunio balticus Heimbach, 1978 are diagnosed and described based on reared material, which was collected in the marine littoral zone along the coast of Bergen (Norway). Male and female adults and larvae of C. balticus can be easily distinguished from other known European Clunio species on the basis of some atypical features found in the male and female adults and fourth instar larvae. The biological cycle (reproduction and emergence) of C. balticus is a slight semilunar-periodic synchronization on days near the high tides. C. balticus is a local biogeographic representative of the northern Atlantic coast, which includes the eastern and western seashores. Remarks on related known Clunio species from Europe with comments on the ecology and geographical distribution of C. balticus are given.
