Psectrosciara ahuatla Huerta & Dzul-Manzanilla & Manrique-Saide & Amorim 2019, sp. nov.
Creators: name: Huerta, Heron
name: Dzul-Manzanilla, Felipe
name: Manrique-Saide, Pablo
name: Amorim, Dalton De Souza
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Scatopsidae
Psectrosciara
Psectrosciara ahuatla

description: Psectrosciara ahuatla Huerta & Amorim, sp. nov.
(Figs. 1A, 2 A–B, 3A–C, 4A, 5A, C, E, 6A–B, 7A–C, 10, 11A–B, 12A–C, 13A–B, 14A)
Type material. HOLOTYPE Male: MEXICO, Guerrero, Municipio Tecpan de Galeana, Nuxco, huerta de mango, 17° 11’ 45.22” N, 100° 46’ 6.79” W, 15 m, Malaise trap, 17–January–2013. Morales–Ríos, E., leg. (CAIM; permanent microscope slide). PARATYPES: 2 Males, same data as holotype, but locality Acapulco, nuevo centro población, cerca de piscina, posados en vegetación, Dzul, F., leg. (male and female in copula); 1 Male, Acapulco, xii.1963, N.L.H. Krauss, leg. (NMNH) (examined by DSA).
Diagnosis. Male gonostyle with a distal triangular projection densely covered with spines; aedeagus short, ending well before tip of gonostyles. Female T7 subrectangular, longer than wide, with medial notch on posterior margin, lateral blade–like sclerites, mesally with dense rows of apparent folds.
Male (Figs. 1A, 10). Body length, 3.5 mm. Head (Fig. 2A). Dark brown, longer than wide, 0.37 mm long; holoptic, setae between facets, interommatidial setae length similar to facet width; ommatidia with similar size; three ocelli, mid ocellus smaller, lateral ocelli of similar size. Occiput pilose, with a lateral pair of sensillae; frontal furrow marked by a line; frontoclypeus setose. Labella short, setose. Maxillary palpus about as long as labella, 0.10 mm long, covered with scattered setae and with an apical broad, rounded sensory pit (Fig. 2B). Postmentum elongate, curved and laterally compressed at base, widening towards distal end. Antenna uniformly brown, slightly shorter than head, 0.36 mm long; scape as long as wide, pedicel subcylindrical; flagellum with 8 flagellomeres, flagellomere 1 with pale base; flagellomeres I–VII wider than long, distal segments wider than basal segments, flagellomere VIII club–shaped; scattered setae on each flagellomere, which are covered with microtrichia and sensillae. Thorax. Dark brown; longer than wide, laterally compressed; scutum rather sparsely covered with short setae; pleural sclerites dark brown; antepronotum and proepimeron setose; spiracular sclerite (dorsal half of proepimeron) setose, longer than wide, spiracle small, confined to posterior margin at more or less membranous area of sclerite; all other pleural sclerites setose; a group of short setae on metepisternum, ventrally to posterior spiracle. Legs. (Figs. 3 A–C). Dark brown. Length of femora and tibiae similar; tibiae with pale brown subbasal rings; fore femur inflated, fore tibia club–shaped. Tarsomere I of all legs longer and wider than distal tarsomeres, tarsomeres 1 to 3 of all legs with a row of ventral palisade setae, more evident on fore leg, no ventral spines on tarsomeres 4, tarsomeres 5 with a pair of apical setae. Tarsomere 1 of fore leg with one basal ventral spine, tarsomere 1 of mid and hind legs with a row of 5–6 strong spines, tarsomeres 2 and 3 of mid and hind legs with distal spine. Claws curved, no teeth; empodium well–de-veloped. Wing (Fig. 4A). Wing extending to fifth abdominal segment, 1.8 mm long, 0.72 mm wide. Membrane of all posterior cells with scattered macrosetae and microsetae, macrosetae present on all veins; anterior veins well sclerotized, brown, posterior veins faint, marked by row of setae. C, R 1 and R 4+5 with an irregular row of short setae. Wing length/costal section 1, 2.6; WL/C2, 3.0; WL/C3, 3.4; C1+C2/WL, 0.70. C extending 0.70 of wing length; humeral vein produced; Sc indistinguishable; first sector of Rs transverse, r–m very short, nearly longitudinal; M 1+2 complete, basal portion of M 1 missing; M 2 and M 4 traceable to base wing; M 1, M 2, M 4 and CuA reaching wing margin, distal end of M 4 slightly beyond tip of R 4+5; CuA curved towards base at proximal third, reaching wing margin slightly before tip of R 1. Haltere whitish. Abdomen (Figs. 1A, 5E, 10, 12 A–C). Dark brown. Pretergites 2 fused to each other, appearing as an intersegmentary band between segments 1 and 2. Tergite 1 rectangular, anterior margin slightly emarginated. Tergites 2 to 5 subcylindrical, tergite 6 subquadrate; tergite 7 0.35 mm long, 0.42 mm wide (Fig. 5A), posterior margin V–shaped, slightly emarginated, with a row of thin black setae. Sternite 1 unsclerotized; sternites 2 to 6 rectangular, with medial pale areas; sternite 7 (Fig. 5C) entirely divided into two lobes narrowly connected at anterior, mostly unsclerotized region, length, 0.27 mm, width, 0.32 mm. Terminalia (Figs. 6 A–B; 7A–C). Laterally compressed, 0.5 mm long, 0.18 mm wide; gonocoxites reduced to a pair of slender stripes devoid of setae; gonostyles basally fused, midportion curved outwards, distal portion widened, hook–shaped, quite densely covered with spines. Cerci digitiform, setose.
Female. Similar to male, except for the following (Fig. 10). Head (Fig. 11A), 0.32 mm long. Maxillary palpus (Fig. 11B), 0.09 mm long, with scattered setae and an apical broad sensory pit and an additional shallow sensory area medial–laterally. Antenna, 0.31 mm long. Wing. 1.62 mm long, 0.5 mm wide. Wing length/costal section 1, 3.1; WL/C2, 2.95; WL/C3, 2.95; C1+C2/WL, 0.66; C extending 0.66 of wing length. Abdomen. (Figs. 10, 12 A–C). Tergite 7 subrectangular, longer than wide (Fig. 13B), 0.62 mm long, 0.45 mm, wide, with a deep, wide posterior medial notch, membranous area in between with a number of parallel slender folds, lateral margins extending distally into a pair of digitiform projections. Sternite 7 (Fig. 13A) wider than long, 0.52 mm long, 0.60 mm wide, anterior margin with a wide concave membranous area, posterior margin acuminate, with a median V–shaped notch, a pair of short, lateral digitiform projections. Spermatheca relatively short, ovoid, 0.18 mm long.
Distribution. Mexico (Guerrero) (Fig. 14A) (Neotropical area of Mexico)
Etymology. The specific epithet is a name used as an apposition derived from the Nahuatl term àhuátl, that stands for “spines”, referring to typical setose gonostyle.
Comments. This species clearly belongs in the group – scatopsiformis of Psectrosciara. The males differ from those of the remaining known Neotropical and Nearctic species of the group by the expanded triangular distal portion of the gonostyles densely covered with spines and the short aedeagus; the females have a sternite 7 with distinct medial notch along the posterior border, with parallel folds, and the lateral blade–like projection in the tergite 7.
description: Published as part of Huerta, Heron, Dzul-Manzanilla, Felipe, Manrique-Saide, Pablo & Amorim, Dalton De Souza, 2019, Psectrosciara Kieffer in Mexico (Diptera: Scatopsidae): two new species and additional records for the genus, pp. 241-259 in Zootaxa 4648 (2) on pages 243-247, DOI: 10.11646/zootaxa.4648.2.2, http://zenodo.org/record/3354814