Orthocladiinae

• Main Authors: Hebert, Torbjørn Ekrem Elisabeth Stur Paul D. N.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Chironomidae; Orthocladiinae; Arctic; Norway
• Online Access: https://doi.org/10.5281/zenodo.12795693; http://treatment.plazi.org/id/6F0387E7C318230BFF71FA2BFD4D76D4

Orthocladiinae Both Bryophaenocladius and Smittia are taxonomically diverse genera, in which most species probably have terrestrial or semi-terrestrial immature stages (Cranston et al. 1989). At least some arctic species of Smittia are known to be parthenogenetic, e.g. S. brevipennis (Boheman, 1856) and S. velutina (Lundbeck, 1898). Only one of three Smittia species, S. nudipennis (Goetghebuer, 1913), is represented by males in our dataset, but the number of sampled specimens is too low to determine whether the other two species are parthenogenetic or otherwise strongly female-biased. Three species of an unrecognisable genus of Orthocladiinae (Genus A) were represented by females only. Morphologically, the specimens are similar to described females in the genera Tavastia , Parasmittia and Gymnometriocnemus , but they do not fit any of the present generic diagnoses. Chaetocladius is a relatively species-rich genus with about 25 recognised species in Europe. It has never been revised, and new findings have often been grouped with the most similar species descriptions. In our collections we have seven different species, of which two are represented by females only. Our Chaetocladius sp. 2 is morphologically similar to C. laminatus Brundin, 1947 in having a broadly triangular gonostylus, but diverges in some details such as a broader anal point, a less crenulate median margin of the gonostylus, and slightly different setation of the anal tergite and gonostylus (see Brundin 1947, fig. 50). In addition to Gymnometriocnemus brumalis (Edwards, 1929) and G. volitans (Goetghebuer, 1940), we found two unidentified species of the genus represented only by females. Three of the five known European species have been recorded in Norway (Saether and Spies 2004), and we have a DNA barcode of the third of these species, G. subnudus (Edwards, 1929), from a different locality. Since the genetic distances between our unknown females and the identified males range between 6% and 15%, we suspect that the two unidentified female ...