Paradelia hedgreni ( Ringdahl, 1959 )

Michelsen, Verner, 2007, Taxonomic review of Eurasian Paradelia Ringdahl (Diptera: Anthomyiidae) with descriptions of two new species, Zootaxa 1592, pp. 1-44 : 15-16

10. Paradelia hedgreni ( Ringdahl, 1959)

Figs. 1, 2, 4 , 56–59 .

Pseudonupedia hedgreni Ringdahl, 1959: 294 , fig. 102.

‘ Pseudonupedia setinerva Ringdahl’; Hennig 1972: 439, in part. Misidentification. Paradelia (Paradelia) hedgreni (Ringdahl) ; Griffiths 1987: 745, 777.

Lectotype designation. The material of Pseudonupedia hedgreni Ringdahl in Coll. Ringdahl (MZLU) originating from G.W. Hedgren consists of 4 males and 3 females that are no doubt conspecific. They are from Uppland, probably from near Uppsala where the collector lived. They all bear a label ‘Expflt. Uppl. /5[or 6] 1923 Hedgren’ and have been reared in May and June. One male has a Ringdahl label saying that it was reared from the bolete fungus Boletus [= Suillus ] granulatus and this may apply to the entire sample. In order to fix the identity of the name hedgreni I have labelled and designate herewith as lectotype 1 male with Ringdahl’s pencil-written identification label ‘ Pseudonupedia Hedgreni sp.n. in litt.’ The other 3 males have been labelled as paralectotypes. As Ringdahl (1959) did not mention the female sex the 3 females in Hedgren’s sample have no type status.

Taxonomic remarks. The original description of the present species by Ringdahl (1959) was very casual and appended to the description of his new species Pseudonupedia setinerva (= Paradelia palliceps (Zetterstedt) , see above). Ringdahl’s text in Swedish says that he many years ago had received a species from Captain Hedgren reared from a bolete fungus that deviated from P. s e t i n e r v a in the shape of the male sternite V. He tentatively treated this “form” as possibly distinct from P. s e t i n e r v a and named it ‘ Hedgreni ’, but gave no details on the origin (in Sweden) or contents of the material examined (see above for details). Hennig (1972), based on a superficial examination of several specimens from the Hedgren sample, formally synonymized Pseudonupedia hedgreni Ringdahl with P. s e t i n e r v a Ringdahl. Michelsen (2004) considered this a mistake and resurrected Paradelia hedgreni (Ringdahl) as a valid species.

Description. Closely resembling P. palliceps but differing as follows.

Male. Smaller: WL c. 5.2mm vs. 5.6–6.2mm. Parafacial narrow, in middle not wider than basal width of fore tibia. Vein C dorsally without setulae basal to subcostal break. Sternite V ( Figs. 56, 57 ) with angular lamella much broader and obtusely rounded apically, well ahead of apical margin giving rise to a small, bare, thumb-like process ( Fig. 57 , arrow). Cerci and surstyli ( Figs. 58, 59 ) very similar except less constricted on basal part of surstyli, especially in lateral aspect.

Female. Smaller: WL 4.8–5.6mm vs. 6.0–6.6mm. Thorax and abdomen densely olive-grey dusted, without apparent darker striping dorsally. Palpus black, ochre yellow on extreme basal part. Colour of legs mainly brownish black, but to varying extent yellow ochre on coxae, trochanteres and femoral bases.

Palpus ( Fig. 2 ) strikingly long, spatulate subapically and sparsely setose. Parafrontal narrower, below middle of frons about one-sixth as wide as frontal vitta. Parafacial narrower, in middle not exceeding basal width of fore tibia. Vein C dorsally bare basal to subcostal break, sometimes more extensively devoid of setulae. Oviscapt practically as in P. palliceps (cf. Fig. 14 ).

Material examined. Sweden: Skåne [ ZMUC]: Åbrolla, Osby, 1 female 26-30.vi.2004 (V. Michelsen); Uppland [ MZLU]: ‘experimental field’, 4 males [lectotype and paralectotypes, see designation above], 3 females reared May–June 1923 from Suillus granulatus [ Boletaceae ] (G.W. Hedgren). Georgia [Coll. D.M. Ackland, ZMUC]: Caucasus, Kazbegi, Mt Sameba forest, 2100–2200m, 5 females 4.vii.1983 (A.C. Pont); forest E of Kazbegi, 2000m, Malaise trap, 1 female 10–11.vii.1983 (A.C. Pont).

Additional, tentatively identified females: CANADA [ ZMUC, BMNH]: Alberta: Banff, 1 female 26.v.1922 (C.B.D. Garrett); Jasper Nat. Park, foot of Mt. Whistler, 4300ft, Malaise trap, 1 female 25.vii.1979 (A.C. Pont).

Other material (teste D.M. Ackland). United Kingdom [ UMNH]: Scotland: Monifieth, Forfar, 1 male 7.viii.1919 (A.E. Carter); without locality, 1 male 23.vi.1923 (A.E. Carter). New to the British list because previously misidentified as Pseudonupedia setinerva Ringdahl (Kloet & Hincks 1976) or Paradelia palliceps (Zetterstedt) (Chandler 1998) . Accordingly, Paradelia hedgreni ( Ringdahl, 1959) should replace P. palliceps ( Zetterstedt, 1845) on the British list of Anthomyiidae .

Distribution. A little known species found thus far in Sweden (Skåne, Uppland), Scotland, and the Caucasus Mts. ( Georgia). I have further seen two females from Alberta, Canada that agree closely with Palaearctic ones except in respect to the extensive yellow ochre colour of femora and tibiae. However, males are required in order to confirm that P. hedgreni has a Holarctic distribution.

Figures

FIGURES 1 – 5. Paradelia spp. 1. P. hedgreni, female. 2. P. hedgreni, female head. 3. P. palpata, male. 4. P. hedgreni, female, detail of left wing. 5. P. intersecta, female, detail of left wing. Same scale for 1, 3 and 4, 5 respectively.

FIGURES 56 – 59. Paradelia hedgreni, male. 56, 57. Sternite V, lateral and ventral views. 58, 59. Hypopygium, lateral and caudal views. Same scale for 56, 57 and 58, 59 respectively. See text for explanation of arrow.

FIGURES 11 – 15. Paradelia spp., females. Oviscapt and distal parts of oviscapt, flat mounted. 11. P. lunatifrons. 12. P. lundbeckii. 13. P. h e l l en i. 14. P. palliceps. 15. P. intersecta. Same scale.