Oryctochlus brundini, Lukashevich, 2012

Lukashevich, Elena D., 2012, Pupae of Mesozoic Oryctochlus Kalugina, Į 985 (Chironomidae: Podonominae), with description of two new species, Fauna norvegica 3, pp. 59-65 : 62

Oryctochlus brundini n. sp.

Material examined

Holotype: PIN 4270 /2343 (well-preserved exuvium); SW Mongolia, Shar Teg (outcrop 434/2); Late Jurassic.

Diagnosis (Figures 1E, J, 2A, B, 3C)

Measurement (mm). Total length 5.7; anal lobe length 0.75, width 0.26; thoracic horn length 0.47, width 0.33. Exuvium pale, uniformly coloured. Thoracic horn dark, large, ovoid, 1.5x as long as wide, broadest near base, 0.7x as wide as segment IX and 0.3x as wide as segment VIII, plastron plate small. Wing sheaths wide, without nose, not tapering. Sternites with sharply delineated apophyses. Abdominal chaetotaxy not preserved. Apicolateral lobes of segment VIII long, about 2/5 of total length, enveloping almost half of segment IX. Anal lobe elongated, 2.8x as long as wide, anal lobe with strongly divergent inner margins. Genital sacs of female reaching 2/3 of anal lobe length.

Remarks

The new species is close to O. minor and O. mirificus in the shape of segment VIII (Figures 1 D, G), but differs from these species in the shape of thoracic horn (Figure 1L) and in the inner margins of anal lobe being strongly divergent.

Etymology

Named in the memory of L. Brundin, an outstanding Swedish expert in Chironomidae .