Peromyia lindstroemi, 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 : 363-365

Peromyia lindstroemi sp. nov.

Figs 25–27

Diagnosis. This new Peromyia is classified in the P. caricis group ( Jaschhof 2017b: 65) for the flagellomeres have a single girdle of hair-shaped translucent sensilla ( Fig. 25 ), and because of the presence of both a simple, subcylindri- cal gonostylus and an ovate tegmen with indistinct ventral shield ( Fig. 26 ). A combination of genitalic characters is specific to P. lindstroemi , as follows. The slightly bent gonostylus is twice as long as wide ( Fig. 26 , ↓ 3), without a lobe dorsobasally ( Fig. 27 ); the tegmen is slightly constricted subbasally and broadly rounded apically; the ventral shield, of which only the posterior edge is discernible, extends almost to the tegminal apex (↓ 4); the broad, ventroanterior edge of the gonocoxal synsclerite is somewhat angular (↓ 5); and below the ventral gonocoxal emargination is a large, membranous area of subtriangular shape. Females and preimaginal stages of this new Peromyia are unknown.

Other male characters. Body size 0.9 mm. Head. Postfrons non-setose. Eye bridge 2–3 ommatidia long dorsally. A single row of 8 postocular bristles. Neck of fourth flagellomere longer than node ( Fig. 25 ). Palpus short, 4 segments successively decreasing in length. Wing. R 1 twice as long as Rs. Anterior portion of C extends beyond R 5 for once the vein width. Legs. Claws toothless. Genitalia ( Fig. 26 ). Ninth tergite interrupted medially. Dorsal gonocoxal bridge broadly rounded anteriorly. Tegmen without microtrichose lobe ventrally (which is usually present in species of the caricis group).

Etymology. This species is named to honor Mattias Lindström, of Länsstyrelsen Hallands län (Halmstad, Swe- den), an enthusiastic explorer of nematocerous Diptera diversity and ecology, and collector of the holotype specimen of this new species.

Type material. Holotype. Male, Sweden, Halland, Laholm, Blåalt Nature Reserve , oak forest, 12 June–8 July 2019, Malaise trap, M. Lindström (spn. CEC 2727 in NHRS).

Other material examined. Sweden: 1 male (only genitalia mounted on slide), Öland, Borgholm, Rönnerum- Abbantorp NR, mixed broadleaf forest, 17 June–15 July 2015, MT, MCJ (spn. ZFMK-TIS 2565535 in NHRS) ; 1 male (only genitalia mounted on slide), Småland, Nybro, Bäckebo, Grytsjön NR, old-growth mixed hemiboreal forest, 19 June–16 July 2014, MT, MCJ (spn. ZFMK-TIS 2549442 in NHRS) .

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.