Pseudolycoriella jejunella, Köhler, 2019

Köhler, Arne, 2019, The genus Pseudolycoriella Menzel & Mohrig, 1998 (Diptera, Sciaridae) in New Zealand, Zootaxa 4707 (1), pp. 1-69 : 38

Pseudolycoriella jejunella sp. n.

( Figs 2, 6, 8 & 46 )

urn:lsid:zoobank.org:act:06EB5442-74EE-4676-A0C1-2CC6F04C7EF9

Material studied. Holotype male. New Zealand: South Island , Southland , Fiordland , Fiordland NP, Hollyford River Valley , Moraine Creek Track, mixed podocarp/ Nothofagus forest, Malaise trap, 05– 24.01.2002, M. & C. Jaschhof ( NZAC, SDEI-Dipt-0000880) . Paratypes. 1♂ same locality and same date as holotype ( SDEI, SDEI-Dipt- 0000935) . 1♂ South Island , Southland , Otago Lakes , Fiordland NP, Hollyford River Valley S Divide Creek, mixed Nothofagus /broadleaf forest, Malaise trap, 06– 24.01.2002, M. & C. Jaschhof ( SDEI) .

Description. Male. Head. Head capsule brown, concolourous with thorax. Eye bridge one to three facets wide. Scape and pedicel not paler brown than the flagellum; fourth flagellomere ( Fig. 2 ) 1.9–2.3 times longer than wide; necks of flagellomeres well differentiated; surface of flagellomeres rough with deep pits, sensilla of two different lengths, small ones and longer, curved sensilla; setae on the flagellomere as long as flagellomere width, slightly curved. Maxillary palp ( Fig. 6 ) short and three-segmented, first palpomere is the longest, third one shortest, first palpomere with long sensilla and three to four long bristles, one bristle longer and more robust, located on the outer side. Prefrons and clypeus bulging. Thorax brown, mesonotum slightly darker. Posterior pronotum bare. Anterior pronotum with four setae. Episternum 1 with five setae. Mesonotum with five robust lateral bristles. Scutellum with two robust bristles and several minor setae. Katepisternum as long as high. Wing. Length 2.0– 2.1 mm; width/length ratio 0.38–0.41. Membrane transparent and without macrotrichia, anal area present; all posterior veins distinct, stem of M weak; apical 33–40% of R 5 with macrotrichia on ventral and dorsal side; r-m and bM without macrotrichia; R 1 approximately 0.6–0.7 times as long as R; c/w ratio 0.7; r-m 1.2–1.8 as long as bM. Haltere brownish; head of haltere as long as shaft. Legs brownish, coxae as brown as thorax. Tibial organ surrounded by a circular border and as wide as half width of tibial apex; tibial organ ( Fig. 8 ) consists of approximately eight bristles arranged in an irregular row. Front tibia without robust bristles among the vestiture. Mid tibia with one or two slightly robust bristles. Posteriodorsal row of bristles on hind tibia present but inconspicuous. All tibial spurs equal in length. Claws with five robust teeth. Abdomen brown, concolourous with thorax; with long, dark setae. Hypopygium ( Fig. 46 ). Gonocoxites wider than long, inner side of gonocoxites with short setae, outer side with long setae; ventral, inner side of gonocoxites basally separated. Gonostylus slender, 3.0–3.4 times longer than wide; apical fourth kinked inwards, apical cavity present, but inconspicuous, scattered with some microtrichia; one spine present, located subapically, medium long whip-lash hair present. Tegmen of the typical ground plan of the Psl. jejuna complex, with an acuminate basic shape; the dorsal folds strikingly developed; parameral apodemes basally strongly sclerotized. Area of teeth absent. Ejaculatory apodeme short and dark, base of ejaculatory apodeme not visible. Posterior portion of gonocoxal apodeme medium sized and brown, joined medially. Anterior portion of gonocoxal apodeme short and dark brown.

Body size: 1.9–2.5 mm.

Female. Unknown.

Genetic distances. Both available COI sequences are identical and do not show any distance. The nearest neighbour is Psl. maddisoni , diverging by a minimum of 10.79%. The nearest neighbour of the single available 28S sequence is Psl. whakahara , diverging by a minimum of 0.24%.

Etymology. The epithet jejunella is the diminutive of jejuna , and refers to the smallness of the new species compared with Psl. jejuna .

Distribution. New Zealand.

Discussion. By its small body and wing length Psl. jejunella can be easily separated from most other species of this complex. Only specimens of Psl. whena and small specimens of Psl. sudhausi are similarly small. In addition, the structure of the gonostylus is unique in this complex. With a gonostylar index of 3.0–3.4, the gonostylus of Psl. jejunella is more slender than in most other species. Only some individuals of Psl. dagae and Psl. hauta lie in this range. Furthermore, the gonostylus appears more tubular and does not show the typical cavity on the inner basal side, and the spine on the gonostylus is more subapically located than in other species.

Figures

FIGURES 1–9. Various body parts of Pseudolycoriella spp., in lateral view. 1. Pseudolycoriella dagae sp. n., fourth flagellomere. 2. Pseudolycoriella jejunella sp. n., fourth flagellomere. 3. Pseudolycoriella aotearoa sp. n., fourth flagellomere. 4. Pseudolycoriella bispina Mohrig, fourth flagellomere. 5. Pseudolycoriella puhihi sp. n., fourth flagellomere. 6. Pseudolycoriella jejunella sp. n., palp. 7. Pseudolycoriella robustotegmenta sp. n., head. 8. Pseudolycoriella jejunella sp. n., tibial organ. 9. Pseudolycoriella hauta sp. n., wing. Abbreviations: aa = anal area; bM = base of the medial vein; c = distance between intersection of vein R5 and radial vein and the end of costal vein; CuA1/CuA2 = first and second branch of the anterior branch of the cubital vein; M1/M2 = first and second branch of the medial vein (“M-fork”); R = radial vein; R1/R5 = first and fifth branch of the radial vein; r-m = crossvein between radial and median veins; w = distance between intersection of vein R5 and radial vein and intersection of vein M1 and wing margin.

FIGURES 43–47. Pseudolycoriella jejuna complex, hypopygia. 43. Pseudolycoriella tewaipounamu sp. n. 44. Pseudolycoriella hauta sp. n. 45. Pseudolycoriella whakahara sp. n. 46. Pseudolycoriella jejunella sp. n. 47. Pseudolycoriella maddisoni sp. n.