Peromyia elongatula, Jaschhof & Jaschhof, 2020

Jaschhof, Mathias & Jaschhof, Catrin, 2020, An update of Micromyinae (Diptera: Cecidomyiidae) taxonomy, with descriptions of a new genus and 13 new species from Northern Europe, Zootaxa 4750 (3), pp. 349-369 : 363

Peromyia elongatula sp. nov.

Fig. 24

Diagnosis. Peromyia elongatula closely resembles the Japanese P. avia ( Jaschhof 2001: fig. 51A–C), a species of the P. sanguinea group ( Jaschhof 2017b: 107). Both differ from each other mainly in genitalic characters, as follows. The gonostylus of P. elongatula is straight rather than curved ( Fig. 24 , ↓ 1); the tegmen, particularly the tapered portion beyond the ventral shield, is longer (↓ 2); and the microtrichia on the medial gonocoxal bridges are inconspicuous, not dense and large. As another distinction, in P. elongatula all claws are untoothed, while the claws on the midlegs of P. avia are finely toothed. Other characters, such as the non-setose postfrons, flagellomeres with two girdles of hair-shaped translucent sensilla, postocular bristles present in a single row, and the four-segmented palpus, are all shared by both species. A Peromyia more distantly related to P. elegantula is P. composita Jaschhof , whose tegmen and ventral shield are of similar outline, while the gonostylus is markedly more slender and the nonsetose, ventroanterior portion of the gonocoxae is much larger ( Jaschhof 1998: figs 228a–d). Females and preimaginal stages of P. elongatula are unknown.

Etymology. The species epithet, a Latin adjective meaning ̒slightly elongated’, refers to the shape of the teg- men.

Type material. Holotype. Male, Sweden, Dalarna, Orsa, Oljonsbyn , backyard with diverse flora including woody plants, 14–30 July 2016, Malaise trap, M. & C. Jaschhof, B. Oldhammer & K. Hedmark (spn. CEC 2728 in NHRS) . Paratypes. 1 male, same data as the holotype (spn. CEC 2729 in NHRS) ; 2 males, same data but 31 July–24 August 2016 (spns CEC2730 – CEC 2731 in NHRS) ; 2 males, same data but 17 September 2016 – 18 June 2017 (spns CEC2732 – CEC 2733 in SDEI) .

Other material examined. Sweden: 1 male, Öland , Borgholm, Horns kungsgård NR, mixed broadleaf forest at lakeside, 12 June–20 July 2015, MT, MCJ (spn. CEC 2734 in SDEI) .

Figures

FIGURES 24–27. Male morphology of Peromyia elongatula (24) and Peromyia lindstroemi (25–27), holotypes. 24: Genitalia, ventral. 25: Fourth flagellomere, lateral. 26: Genitalia, ventral. 27: Gonostylus, dorsal. Scales 0.025 mm. Arrows refer to characters described in the diagnoses.