Pseudolycoriella gonotegmenta, Köhler, 2019

Köhler, Arne, 2019, The genus Pseudolycoriella Menzel & Mohrig, 1998 (Diptera, Sciaridae) in New Zealand, Zootaxa 4707 (1), pp. 1-69 : 53

Pseudolycoriella gonotegmenta sp. n.

( Fig. 52 )

urn:lsid:zoobank.org:act:9BD9CFA2-AA84-4340-BA03-C94C77EC9748

Material studied. Holotype male. New Zealand: South Island , Buller, Rahu Scenic Reserve, 12 km NW Springs Junction, altitude 550 m, mixed Nothofagus /podocarp forest, Malaise trap, 27.11– 25.12.2001, leg. M. & C. Jaschhof ( NZAC, SDEI-Dipt-0001495) . Paratypes. 2♂♂ North Island , Ruapehu , Tongariro NP, Mangawhero River Valley 3 km NE Ohakune, altitude 690 m, mixed podocarp/broadleaf forest, Malaise trap, 26.11– 28.12.2002, leg. M. & C. Jaschhof & U. Kallweit (all SDEI) . 2♂♂ North Island , Masterton , Tararua Forest Park, Blue Range Hut Track 10 km SW Mt. Bruce, mixed Nothofagus /podocarp/broadleaf forest, sweep net, 02.02.2002, leg. M. Jaschhof ( NZAC; SDEI) . 1♂ South Island , Buller , Ahaura, Granville State Forest, altitude 170–250 m, Nothofagus truncata forest, Malaise trap, 01.12.1994, leg. J. Hutcheson ( NZAC) . 2♂♂ South Island , Buller, 5 km W Maruia Springs, mixed Nothofagus forest, Malaise trap, 26.11– 25.12.2001, leg. M. & C. Jaschhof ( NZAC, SDEI-Dipt-0000977 & SDEI, SDEI-Dipt-0000984) . 1♂ South Island , Buller, Lake Daniells Track 7 km E Springs Junction, mixed red/sil- ver beech forest, Malaise trap, 24.11– 26.12.2001, leg. M. & C. Jaschhof ( SDEI) .

Description. Male. Head brown; eye bridge three facets wide, two at margin. Flagellomeres brown, concolourous with scape and pedicel; fourth flagellomere 2.6–2.9 times as long as wide; necks of flagellomeres differentiated; surface of flagellomeres rough with deep pits; sensilla of two different lengths present; setae sparse, approximately as long as flagellomere width, bases of setae with slightly raised coronas. Prefrons and clypeus moderately bulging. Maxillary palp three-segmented; first palpomere longest, third longer than second; first palpomere with two to six bristles and an inconspicuous patch of sensilla; usually one of the bristles on first and second palpomere elongated. Thorax brown, laterally extensively brightened. Posterior pronotum bare. Anterior pronotum with five to seven long bristles. Episternum 1 with six to eleven long bristles. Mesonotum with five to six longer bristles among the lateral bristles; row of dorsocentral bristles well developed. Scutellum with two to four robust and some shorter bristles. Katepisternum as long as high. Wing. Length 2.0– 2.3 mm; width/length ratio 0.35–0.41. Membrane transparent and without macrotrichia, anal area present; all posterior veins distinct, all without macrotrichia; apical 25%–40% of R 5 with additional macrotrichia on ventral side; bM and r-m bare; R 1 short, 0.64–0.77 times as long as R; M-fork longer than stem of M or—in one case—as long as stem of M; c/w ratio 0.66–0.71; r-m/bM ratio 0.7–1.2. Haltere pale brown. Legs pale brown; coxal bristles dark. Fore tibia with one to three bristles among vestiture; tibial organ comprising half of tibial apex, consisting of a transverse patch of bristles surrounded by a robust circular border. Mid tibia with four to six robust bristles among vestiture, located anterio- and posterioventrally. Hind tibia with seven to 17 robust bristles on anterioventral, posterior and posterioventral sides and a longitudinal row of robust bristles, which extends two-thirds to four-fifths of tibial length. Basal tarsomere of all legs with conspicuous robust bristles. All tibial spurs equal in length. Claws with one robust tooth and several minor teeth. Abdomen. Pale brown, with dark bristles. Hypopygium ( Fig. 52 ) brown. Gonocoxites wider than long, ventrally u-shaped and not fused, without a basal lobe of bristles. Gonostylus elongate, apically curved inwards, apex slightly tapered, without an angle at the base of the gonostylus, 2.6–3.3 times longer than wide; apically with dense setae and a group of approximately five to six spines; subapically with one to three medium-sized whip-lash hairs. Tegmen wider than long, base very strongly sclerotized with short, robust parameral apodeme; lateral margin of tegmen with a sclerotized edge, scattered with several small teeth, apically mostly fused (two exceptions with membranous gaps at apex); dorsal structures on tegmen well developed, as long as half tegmen length. Area of teeth with seven to 40 conspicuous teeth. Ejaculatory apodeme short, broad, and dark. Posterior portion of gonocoxal apodeme broad and brown. Anterior portion of gonocoxal apodeme broad and short.

Body size: 1.7–2.4 mm.

Female. Unknown.

Genetic distances. The maximum p-distance between all three available COI sequences is 0.20%. Some of these COI sequences are identical with that of Psl. plicitegmenta . The one available 28S sequence is identical to those of Psl. frederickedwardsi, Psl. huttoni, Psl. jaschhofi, Psl. macrotegmenta, Psl. plicitegmenta, Psl. robustotegmenta, Psl. subtilitegmenta, Psl. tonnoiri , and Psl. wernermohrigi .

Etymology. The epithet of the new species is composed of the Greek word γωνοζ (gonos, edge) and the Latin word tegmen (cover; technical term for a part of the sciarid hypopygium).

Distribution. New Zealand.

Discussion. With the margin of the tegmen apically fused, Psl. gonotegmenta resembles Psl. huttoni and Psl. wernermohrigi . Pseudolycoriella huttoni differs by having a u-shaped base of the ejaculatory apodeme, a lower R 1 /R ratio (0.56 vs. 0.64–0.77), and a smaller anterior portion of gonocoxal apodeme. Pseudolycoriella wernermohrigi has a much longer ejaculatory apodeme, a longer parameral apodeme, and a longer anterior portion of gonocoxal apodeme. In specimens where fragmentation of the tegmen margin has occurred, as for example in two paratypes of Psl. gonotegmenta , the base of the ejaculatory apodeme has to be examined to enable separation from Psl. plicitegmenta . In Psl. gonotegmenta this base is long and broadly v-shaped while Psl. plicitegmenta has a short a u-shaped base. In addition Psl. plicitegmenta possess a basal angle on the gonostylus, which is lacking in Psl. gonotegmenta .

Figures

FIGURES 48–53. Pseudolycoriella macrotegmenta complex, hypopygia. 48. Pseudolycoriella macrotegmenta Mohrig 49. Pseudolycoriella plicitegmenta sp. n. 50. Pseudolycoriella wernermohrigi sp. n. 51. Pseudolycoriella huttoni sp. n. 52. Pseudolycoriella gonotegmenta sp. n. 53. Pseudolycoriella subtilitegmenta sp. n. Abbreviations: ba = basal angle; ds = dorsal structure on the tegmen; lt = teeth on lateral side of the tegmen.