Downlooker snipe fly Rhagio mystaceus, copyright Bruce Marlin.

Belongs within: Tabanomorpha.

The Rhagionidae are a group of slender flies, mostly of poorly known habits though females of some are blood-suckers.

Characters (from James & Turner 1981): Slender flies, 4-15 mm long. Legs usually elongated. Abdomen elongated and conical. Body usually thinly clothed with stiff pile, but rarely with bristles. Color basically drab, but frequently with yellow or orange markings, rarely predominantly so. Head hemispherical, sometimes narrower than thorax. Vertex nearly flush with eyes. Facial area with prominent strongly convex clypeus extending almost to base of antennae and separated from parafacials by deep grooves. Eyes bare, holoptic or narrowly separated in male, widely separated in female; upper ommatidia in male usually enlarged. Antenna variable in form; scape and pedicel usually small, but scape sometimes lengthened, expanded, or densely haired; flagellum with eight tapering flagellomeres, or with an enlarged sometimes pendulous basal flagellomere bearing an apical usually unsegmented stylus or arista. Proboscis usually fleshy, sometimes equipped for sucking blood; palpus well-developed, two-segmented. Thorax of ordinary form; scutellum fairly large, unarmed. Legs simple, never dilated, at most with hind femur somewhat clubbed; hind coxa usually with small tubercle anteriorly; spurs present at apex of at least mid tibia though these are sometimes small, and one or two usually present on hind tibia; fore tarsus frequently with erect tactile hairs below; empodia pulvilliform. Calypter small. Wing always present, elongated; venation strong; C continued around wing as an ambient vein; cell d or dm situated near center of wing, rarely absent; M two- or three-branched; Rs arising far before base of cell d or dm; crossvein r-m usually well before, rarely at, middle of cell d or dm. Abdomen usually with seven segments and portions of terminalia visible, tapered posteriorly; seven pairs of spiracles present. Female terminalia with ovipositor telescopic; cercus two-segmented, with first segment usually expanded ventrolaterally; three round spermathecae. Male terminalia with hypandrium partially or completely distinguishable from bases of gonocoxi; gonostylus simple; parameres forming conical aedeagal sheath; epandrium together with a narrow tergite 10 and cerci not completely covering gonopods. Larva elongated, cylindrical, somewhat maggot-like, tapering anteriorly, more or less truncate and variously lobed posteriorly, consisting of a head and eleven distinct body segments that are never secondarily divided. Head capsule slender, widely open posteroventrally, mostly retracted within thorax; tentorial phragmata and tentorial arms present; no metacephalic rods; mandible slender, curved, blade-like, not provided with a poison canal, articulated to mandibular brush of posteriorly curved spines and to maxilla lying laterally. Body smooth or with hairs and bristles. Creeping welts present ventrally on abdominal segments 1-6 or 1-7. Respiratory system amphipneustic or apneustic; anterior spiracles probably not functional; posterior ones usually functional, located flush with body wall on posterior face of terminal segment. Terminal segment with lobes or tubercles of various form surrounding spiracles; no respiratory tube.

    |--Scelorhagio mecomastigus Zhang, Zhang & Li 1993 MR03
    |--Palaeoarthroteles mesozoicus BLM02
    |--Paleobrachyceron willmanni GE05
    |--Grimmyia baltica GE05
    |--Protobrachyeron GE05
    |--Ija problematica GE05
    |--Jurabrachyceron GE05
    |--Archirhagio GE05
    |--Paleobolbomyia GE05
    |--Mongolomyia latitarsis GE05
    |--Leborhagio GE05
    |--Mesobolbomyia GE05
    |--Paleochrysopilus GE05
    |--Atherinomorpha festuca GE05
    |--Jersambromyia borodini GE05
    |--Zarzia zherikhini GE05
    |--Pachybates St61
    |--Arthroceras leptis JT81
    |--Palaeohilarimorpha bifurcata W81
    |--*Neorhagio setosus [=Leptis setosa] K09
    |--Atherimorpha K09
    |--Austroleptis [Austroleptinae] K09
    |    `--A. rhyphoides CM91
    |--Simulidium Westwood 1854 MR03
    |    `--*S. priscum Westwood 1854 MR03
    |--Pseudosimulium Handlirsch 1906 MR03
    |    `--*P. humidum (Brodie 1845) [=Simulium humidum] MR03
    |--Ptiolinites GE05
    |    |--P. almuthae GE05
    |    |--P. cretaceous GE05
    |    `--P. oudatchinae GE05
    |--Spaniopsis White 1914 F15
    |    |--S. clelandi Ferguson 1915 F15
    |    |--S. longicornis Ferguson 1915 F15
    |    |--S. marginipennis Ferguson 1915 F15
    |    |--S. tabaniformis White 1914 F15
    |    `--S. vexans Ferguson 1915 F15
    `--Rhagio Fabricius 1775 [=Leptis Fabricius 1805] So61
         |--R. atratus L02
         |--R. holosericeus [=Styrex holosericeus] L02
         |--R. maculatus L02
         |--R. mystaceus JT81
         |--R. scolopaceus L02 [=Leptis scolopacea F15]
         |--‘Leptis’ strigosa F15
         |--R. tringarius L02
         `--R. vertebratus JT81

*Type species of generic name indicated


[BLM02] Blagoderov, V. A., E. D. Lukashevich & M. B. Mostovski. 2002. Order Diptera Linné, 1758. The true flies (=Muscida Laicharting, 1781). In: Rasnitsyn, A. P., & D. L. J. Quicke (eds) History of Insects pp. 227–240. Kluwer Academic Publishers: Dordrecht.

[CM91] Colless, D. H., & D. K. McAlpine. 1991. Diptera (flies). In: CSIRO. The Insects of Australia: A textbook for students and research workers 2nd ed. vol. 2 pp. 717–786. Melbourne University Press: Carlton (Victoria).

[F15] Ferguson, E. W. 1915. Descriptions of new Australian blood-sucking flies belonging to the family Leptidae. Journal and Proceedings of the Royal Society of New South Wales 69: 233–243.

[GE05] Grimaldi, D., & M. S. Engel. 2005. Evolution of the Insects. Cambridge University Press: New York.

[JT81] James, M. T., & W. J. Turner. 1981. Rhagionidae. In: McAlpine, J. F., B. V. Peterson, G. E. Shewell, H. J. Teskey, J. R. Vockeroth & D. S. Wood (eds) Manual of Nearctic Diptera vol. 1 pp. 483–488. Research Branch, Agriculture Canada.

[K09] Kerr, P. H. 2009. Rhagionidae (snipe flies). In: Brown, B. V., A. Borkent, J. M. Cumming, D. M. Wood, N. E. Woodley & M. A. Zumbado (eds) Manual of Central American Diptera vol. 1 pp. 485–489. NRC Research Press: Ottawa.

[L02] Latreille, P. A. 1802. Histoire Naturelle, générale et particulière des crustacés et des insectes vol. 3. Familles naturelles des genres. F. Dufart: Paris.

[MR03] Mostovski, M. B., A. J. Ross, R. Szadziewski & W. Krzeminski. 2003. Redescription of Simulidium priscum Westwood and Pseudosimulium humidum (Brodie) (Insecta: Diptera: Rhagionidae) from the Purbeck Limestone Group (Lower Cretaceous) of England. Journal of Systematic Palaeontology 1 (1): 59–64.

[So61] Southcott, R. V. 1961. Studies on the systematics and biology of the Erythraeoidea (Acarina), with a critical revision of the genera and subfamilies. Australian Journal of Zoology 9: 367–610.

[St61] Stuckenberg, R. R. 1961. Diptera (Nematocera): Thaumaleidae. In: Hanström, B., P. Brinck & G. Rudebeck (eds) South African Animal Life: Results of the Lund University Expedition in 1950–1951 vol. 8 pp. 409–412. Almqvist & Wiksell: Uppsala.

[W81] Webb, D. W. 1981. Hilarimorphidae. In: McAlpine, J. F., B. V. Peterson, G. E. Shewell, H. J. Teskey, J. R. Vockeroth & D. S. Wood (eds) Manual of Nearctic Diptera vol. 1 pp. 603–605. Research Branch, Agriculture Canada.

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