Egle parva Robineau-Desvoidy, 1830

Michelsen, Verner, 2009, Revision of the willow catkin flies, genus Egle Robineau-Desvoidy (Diptera: Anthomyiidae), in Europe and neighbouring areas, Zootaxa 2043 (1), pp. 1-76 : 56-58

20. Egle parva Robineau-Desvoidy, 1830

Figs. 145 , 158–163 , 200–202 .

Egle parva Robineau-Desvoidy, 1830: 590 ; * Karl 1928: 188; * Kröber 1931: 83; Tiensuu 1936: 14; Karl 1937: 139; Ringdahl 1951: 153; Ringdahl 1952: 178;? Gäbler 1958: 805; Ringdahl 1959: 271; Ringdahl 1960: 29; Hennig 1967a: 143, text fig. 135, plate figs 138, 148, 155; Ackland 1970: 188, 192, figs. 17, 18; Elberg 1970: 496; Suwa 1974: 91, figs. 238–241; Hennig 1976: 937, 938; Hackman 1980: 132; Suh & Kwon 1985: 186, fig. 11 (1–6); Fan et al. 1988: 79, figs. 180, 181 [referred to E. minuta in figure legend]; Barták et al. 1990: 446; Draber-Moṅko 1991: 234; Gosseries & Ackland 1991: 185; Dely-Draskovits 1993: 52; Gorodkov et al. 1995: 6; Chandler 1998: 166; Michelsen & Merz 1998: 314; Xue et al. 1998: 660, fig. 1478; Suwa 1999: 221; Teschner 1999: 131; Darvas 2001: 394; Darvas et al. 2001: 309; Petersen 2001: 184; Beuk et al. 2002: 316; Michelsen 2004; Hua 2006: 98; Komzáková 2006.

Chortophila parva (Robineau-Desvoidy) ; *De Meijere 1907: 163; * Ringdahl 1914: 152; * Kramer 1917: 304.

Chortophila (Egle) parva (Robineau-Desvoidy) ; * Stein 1916: 193; * Séguy 1923: 104, fig. 168d; * Zangheri 1950: 86.

Hylemyia (Egle) parva (Robineau-Desvoidy) ; Ringdahl 1933: 29.

Egle (Hylemyia) parva Robineau-Desvoidy ; Gäbler 1939: 27, figs. 1–3 (in part).

‘ Egle minuta (Meigen) ’; Fan et al. 1988: 79, figs. 183, 184 [referred to E. parva in figure legend]. Misidentification.

Note: References tagged with an asterisk may refer to any species of the Egle minuta section occurring in the areas in question.

For further references, see Bezzi & Stein (1907) and Séguy (1937).

Description. Very similar to Egle minuta but different as follows: Slightly larger, wing length 3.2–4.4 mm.

Male. Parafacial broader, about same width as postpedicel. Lower facial margin strongly projected, reaching further beyond fronto-parafacial angle. Genal setae more abundant, in three irregular rows. Hind leg ( Fig. 145 ). Terminalia ( Figs. 158–163 ): Sternite V with setulae along incised hind margin relatively long and uninterrupted; basal plate with 0–1 short setula postero-laterally. Epandrium smaller, without setulae on lateral parts (as in E. lyneborgi and E. suwai ). Surstyli narrow-based alongside margins of cerci (as in E. lyneborgi and E. suwai ). Apical extension of cerci more constricted basally. Pregonite distinctly wider than long. Phallus with shorter and distally less inflated epiphallus.

Female. Lower facial margin more strongly produced beyond fronto-parafacial angle. Genal setae in 1–2 rows. Proepimerals 3–4. Setulae on lower part of katepisternum unremarkable, not particularly fine and dense. Hind femur with some very short pv-setae on basal half; fine v-seta near base of hind femur usually longer than preapical d-seta on hind tibia. Oviscapt ( Figs. 200–202 ): Sternite VII narrow but usually sclerotized even on middle part. Epiproct not divided along mid-line.

Material examined. European specimens seem from BRITISH ISLES, CZECH REPUBLIC, DENMARK, FINLAND, FRANCE, GERMANY, NORWAY and SWEDEN. TURKEY [ ZMUC]: Bursa: Uludaǧ National Park , 1500–1800m, on flowering Salix , 2 males, 11 females 9.v.1993 ( V. Michelsen) .

Biology. In Denmark, and probably elsewhere in the lowlands of northern Europe, one of the earliest and most abundant species of Egle on Goat willow ( Salix caprea L.), Grey willow ( Salix cinerea L.) and other early-flowering willows. I have found it on Eared willow ( Salix aurita L.) in south Sweden as Karl (1934) did in Poland.

Distribution. Widespread in boreal parts of the Palaearctic Region, but at least in Fennoscandia apparently not reaching beyond or above the tree line. European distribution as summarized by Michelsen (2004): Belgium, British Isles, Czech Republic, Denmark, Finland, France, Germany, Hungary, Italy, Netherlands, Norway, Poland, Sweden and Switzerland. Also from Crimea ( Ukraine) according to Elberg (1970). Presently recorded for the first time from Turkey. The eastern Palaearctic distribution includes northern China: Liaoning, Shanxi, Shaanxi and Gansu ( Hua 2006), Korea (Suh & Kwon 1985) and Japan ( Suwa 1999). Not present in North America as confirmed by Griffiths (2003).

Relationships. Egle parva , the type species of the genus Egle , belongs to the E. minuta species group within the E. minuta section (see above).

Figures

FIGURES 144–145. Egle spp., left hind leg. 144. E. rhinotmeta, male. 145. E. parva, male. Same scale.

FIGURES 158–163. Egle parva, male terminalia. 158, 159. Sternite V, ventral and lateral views. 160, 161. Hypopygium, caudal and lateral views. 162. Pre- and postgonites, lateral view. 163. Phallus, lateral view. Same scale.

FIGURES 200–202. Egle parva, female terminalia. 200. Oviscapt, lateral view. 201. Oviscapt, flat mounted. 202. Spermathecae. Different scales.