Paramerina fragilis Walley

• Main Author: Saether, Ole A.
• Format: Text
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Chironomidae; Paramerina; Paramerina fragilis; Northwest Territories; Canada; Indian; British Columbia; Dillon; O'Connor; Southern Indian Lake
• Online Access: https://dx.doi.org/10.5281/zenodo.6183829; https://zenodo.org/record/6183829

Paramerina fragilis (Walley) (Fig. 8 B–F) Material examined. CANADA: Manitoba, Lake Winnipeg, Hecla Island, light trap, 1 male, 24.viii. 1971, M.P. McLean (CNC). The male is characterized by having faintly banded wings, tergite II and V light colored, LR 1 of about 0.79, dorsocentrals bi-triserial, and, in the present specimen, the nearly complete lack of any inferior volsella on the gonocoxite. Male (n = 1). Total length 3.02 mm. wing length 1.76 mm. Total length/wing length 1.71. wing length/profemur 2.40. T I, II, V and IX pale, with slight infuscation in anterior half; other tergites with basal 2 / 3 brown. Wing with faint banding. Head . AR 1.51. Temporals 13. Clypeus with 26 setae. Cibarial pump, tentorium, and stipes as in Fig. 8 B. Tentorium 167 µm long. Palp lengths (in µm): 38, 67, 186, 158, 300. Thorax (Fig. 8 C). Antepronotum with 4 setae. Dorsocentrals 45, double to triple, including 14 humerals; acrostichals 43; prealars 15; supraalar 1. Scutellum with 23 setae. Wing (Fig. 8 D). VR 0.89. Brachiolum with 2 setae, R with 70 setae, R 1 with 62 setae, R 4 + 5 with 98 setae. Squama with 25 setae. Legs . Spur of front tibia (Fig. 8 E) 42 µm long, spurs of middle tibia (Fig. 8 E) 54 µm and 32 µm long, of hind tibia (Fig. 8 E) 58 µm and 24 µm long. Width at apex of front tibia 44 µm, of middle tibia 43 µm, of hind tibia 47 µm. Tarsal segments of p 2 and p 3 lost. Lengths and proportions of front leg as in Table 2. Femur of p 2 834 µm long, of p 3 736 µm long. Tibia of p 2 748 µm long, of p 3 975 µm long. fe ti ta 1 ta 2 ta 3 ta 4 ta 5 LR BV SV p 1 736 859 681 380 245 190 98 0.79 2.34 2.49 Hypopygium (Fig. 8 F). T IX and laterosternite IX without setae. Phallapodeme 117 µm long. Gonocoxite 216 µm long, nearly without any sign of a inferior volsella; gonostylus 140 µm long. HR 1.54, HV 2.15. Remarks . This male appear to belong to P. fragilis (Walley) (Roback 1971: 271) in the abdominal pattern, wing pattern and high LR 1. However, the hypopygium of P. fragilis (Roback 1971 fig. 520) has a very well-developed inferior volsella on the gonocoxite, while this specimen has only a faint indication of a lobe, i.e. about as in P. smithae (Sublette) (Roback 1971 fig. 528) and P. okigenga (Sasa) (Niitsuma et al. 2011 fig. 17). P. o k i g e n g a also has the same abdominal pattern, but is without a wing pattern and has a lower antennal ratio. According to B. Bilyj (pers. comm.), however, the “inferior volsella” is a flap or even a lobe created as a slide preparation artifact. Bilyj has mounted long series of P. fragilis , but never found the basal lobe as projecting as the one shown by Roback (1971 fig. 520). Distribution. The species is known from the Northwest Territories to Quebec and British Columbia to Quebec and Massachusetts, Oregon and Virginia (Bilyj 1984: 666, Oliver et al. 1990: 13, Ashe & O’Connor 2009: 190). : Published as part of Saether, Ole A., 2011, Notes on some tanypods from Lake Winnipeg, Manitoba, Canada (Diptera: Chironomidae), pp. 26-42 in Zootaxa 3069 on pages 38-40, DOI: 10.5281/zenodo.201708 : {"references": ["Roback, S. S. (1971) The adults of the subfamily Tanypodinae (= Pelopiinae) in North America (Diptera: Chironomidae). Monograph of the Academy of Natural Sciences of Philadelphia, 17, 1 - 410.", "Niitsuma, H., Suzuki, R & Kato, H. (2011) Review of the Japanese species of Paramerina (Diptera: Chironomidae: Tanypodinae), with keys to the known males. Zootaxa, 2821, 1 - 18.", "Bilyj, B. (1984) Description of two new species of Tanypodinae (Diptera: Chironomidae) from Southern Indian Lake, Canada. Canadian Journal of Fisheries and Aquatic Sciences, 41, 659 - 671.", "Oliver, D. R., Dillon, M. E. and Cranston, P. S. (1990) A catalog of Nearctic Chironomidae. Research Branch Agriculture Canada Publication, 1857 / B, 89 pp.", "Ashe, P. & O'Connor, J. P. (2009) A World Catalogue of Chironomidae (Diptera). Part 1. Buchonomyiinae, Chilenomyinae, Podonominae, Aphroteniinae, Tanypodinae, Usambaromyiinae, Diamesinae, Prodiamesinae and Telmatogetoninae. Irish Biographical Society & National Museum of Ireland, Dublin. 445 pp."]}