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Rhagio ID Guide

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Rhagio ID Guide Identifying soldierflies and allies: snipeflies in genus Rhagio Compiled by Martin C. Harvey for the Soldierflies and Allies Recording Scheme Version 1 at 29 February 2020 Records wanted! Once you have identified your These guides are only possible thanks to the generosity of the brilliant photographers who have fly, please let the recording allowed their images to be used. Special mention must be given to Malcolm Storey and Steven Falk, scheme have the details! whose photo collections form the backbone for most of the species guides: Add to iRecord or send to the Malcolm Storey’s BioImages website – Steven Falk’s photo collections on Flickr recording scheme so that we Other photographers included in this guide are Geir79, George Tordoff, Ian Andrews, Martin Harvey can share the records for and Simon Knott. conservation and research. Males are shown first, one page for each species, then females. The pages for males include distribution maps taken from the recording scheme’s provisional atlas (Harvey 2017). As far as possible, these guides show features that can be seen on live insects in the field, or are likely to be visible in photographs. For comprehensive identification keys and species accounts see British soldierflies and their allies, by Alan Stubbs and Martin Drake. See also the recording scheme’s additional notes to accompany the Stubbs and Drake keys. For lots more information on soldierflies and allies go to the recording scheme website, Twitter page or Facebook group. For lots more information and events, and to support the study and conservation of flies, please consider joining Dipterists Forum. The Soldierflies and Allies Recording The Soldierflies and Allies Recording Scheme is supported by the UKCEH Scheme is part of Dipterists Forum Biological Records Centre Recognising the genus: Rhagio Genus Rhagio contains six medium to large species (5.5–14mm long). They have the typical long legs and broad Males and females are fairly similar in appearance but can be distinguished by their eyes (male wings of the snipefly family, and all are a combination of yellow and black. Wing venation helps to separate eyes meet at top of head, female eyes have a narrow gap at top of head). Rhagio species from snipeflies in genus Chrysopilus, and wing markings help to separate the species of Rhagio. Three of the species (R. lineola, R. scolopaceus and R. tringarius) are common and widespread, the latter most numerous in damp meadows and wetlands. The other three (R. annulatus, R. notatus stigma and R. strigosus) are all rare. The reasons for this are poorly understood, and in fact the ecology of dark snipeflies in general is not well-known. wings with dark stigma and grey clouding = • R. scolopaceus (common) or • R. strigosus (rare) stigma dark wings with dark stigma only = • R. lineola (common) or • R. notatus (rare) © Steven Falk wing photos © Malcolm Storey / BioImages Remember: stigma pale wings with stigma pale or Chrysopilus is closed, or lacking lacking = Rhagio is open! • R. tringarius (common) or • R. annulatus (rare) Chrysopilus: anal All Rhagio: anal cell cell closed open at wing edge before wing edge © Geir79 via no dark stigma © Geir79 via Diptera.info mark on wing humeri grey, Diptera.info same colour as rest of thorax palps grey/black pale hairs on abdomen Diptera.info link Rhagio annulatus (Wood Snipefly) – MALE compare with the much more widespread R. tringarius © Geir79 via © Geir79 via Diptera.info Diptera.info dark stigma Ian Andrews © Ian Andrews © Malcolm Storey mark on wing link / BioImages the smallest Rhagio species, 5.5–8mm long BioImages link Rhagio lineola (Small Fleck-winged Snipefly) – MALE compare with the rarer R. notatus Steven Falk © Malcolm Storey link / BioImages all femora pale at base © Steven Falk © Ian Andrews dark stigma © Ian Andrews mark on wing Ian Andrews link larger than R. lineola, 8.5– 13mm long all femora dark at base Rhagio notatus (Large Fleck-winged Snipefly) – MALE compare with the much more widespread R. lineola Steven Falk © Ian Andrews link © Steven Falk © Malcolm Storey dark stigma and grey © Steven Falk / BioImages clouding on wing long hairs at sides of abdomen the third antennal segment is the most reliable ID feature – see the comparison page to distinguish from the much rarer R. strigosus BioImages Steven Falk Rhagio scolopaceus (Downlooker Snipefly) – MALE link link third antennal segment pointed this photo shows the typical ‘downlooker’ © Malcolm Storey pose when perched / BioImages on a tree-truck © Steven Falk R. scolopaceus is widespread throughout Britain in many habitats R. scolopaceus: third antennal segment pointed © Malcolm Storey © Steven Falk / BioImages Rhagio scolopaceus and Rhagio strigosus comparison R. strigosus: third antennal segment rounded R. strigosus is only known from chalk areas R. scolopaceus: R. strigosus: of Surrey, Berkshire and long hairs on short hairs on Oxfordshire sides of abdomen sides of abdomen Photos © Martin Harvey / Oxford University Museum of Natural History © Steven Falk BioImages © Malcolm Storey link / BioImages third antennal dark stigma and grey segment rounded clouding on wing Steven Falk link Rhagio strigosus (Yellow Downlooker Snipefly) – MALE the third antennal segment is the most reliable ID feature – see the comparison page to distinguish from the much more widespread R. scolopaceus short hairs at sides of abdomen © Steven Falk no dark stigma Steven © Steven Falk © Steven Falk mark on wing Falk link dark hairs on abdomen humeri orange, contrasting with rest of thorax Rhagio tringarius (Marsh Snipefly) – MALE compare with the rarer R. annulatus palps yellow © Malcolm Storey BioImages © Steven Falk / BioImages link no dark stigma © Ian Andrews mark on wing Ian Andrews © Ian Andrews link pale hairs on abdomen humeri grey, same colour as Rhagio annulatus (Wood Snipefly) – FEMALE rest of thorax compare with the much more widespread R. tringarius Steven Falk link palps grey/black © Ian Andrews © Steven Falk dark stigma © Ian Andrews © Steven Falk mark on wing Ian Andrews Steven Falk link link the smallest Rhagio species, 5.5–8mm long Rhagio lineola (Small Fleck-winged Snipefly) – FEMALE compare with the rarer R. notatus iRecord all femora link pale at base © Simon Knott © Martin Harvey via iRecord © Ian Andrews © Ian Andrews Ian Andrews link larger than R. lineola, 8.5– 13mm long dark stigma mark on wing all femora dark at base Rhagio notatus (Large Fleck-winged Snipefly) – FEMALE compare with the much more widespread R. lineola the orange ‘bump’ on the underside in this photo is a mite, not an Steven Falk © Ian Andrews identification feature! link © Steven Falk © Malcolm Storey / BioImages © Steven Falk dark stigma and grey clouding on wing long hairs at sides of abdomen BioImages Steven Falk link Rhagio scolopaceus (Downlooker Snipefly) – FEMALE link third antennal segment pointed the third antennal segment is the most reliable ID feature – see the comparison page to distinguish from the much rarer R. strigosus sides of thorax grey © Malcolm Storey / BioImages © Steven Falk © George Tordoff © George Tordoff via Steven Falk dark stigma and grey via Steven Falk clouding on wing third antennal segment rounded Steven Falk sides of thorax link usually yellow Rhagio strigosus (Yellow Downlooker Snipefly) – FEMALE the third antennal segment is the most reliable ID feature – see the comparison page to distinguish from the much more widespread R. scolopaceus short hairs at sides of abdomen © George Tordoff © George Tordoff via Steven Falk via Steven Falk © Steven Falk no dark stigma mark on wing BioImages link humeri orange, contrasting with © Malcolm Storey / BioImages rest of thorax Rhagio tringarius (Marsh Snipefly) – FEMALE compare with the rarer R. annulatus dark hairs on abdomen Steven palps Falk link yellow © Steven Falk © Steven Falk.
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