Psectrosciara otumba Huerta & Amorim, 2019

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, Zootaxa 4648 (2), pp. 241-259 : 247-252

Psectrosciara otumba Huerta & Amorim , sp. nov.

( Figs. 1B , 2 C–D, 3D–F, 4B, 5B, D, 8A–B, 9 A–B, 11C–D, 13C–D, 14A–B)

Type material. HOLOTYPE Male: MEXICO, Estado de México, Municipio Otumba, Coyotepec , 19º 39’ 09.3” N, 98º 45’ 25.7” W, 2481 m, Malaise trap, April 12 –May 4.2007, Hernández–Zetina, D., leg. ( CAIM; on slide) . Paratypes: 3 Males and 2 Females, same data as the holotype (2 males preserved in ethanol 75%) .

Diagnosis. Gonostyles apically with a slender, digitiform dorsal process; aedeagus well–developed, elongate, projecting medially beyond tip of gonostyles. Female S7 with a pair of medial lobes with a deep notch in between, T7 regularly sclerotized, no membranous area or folds medially, T7 and S7 with a pair of digitiform lateral projections with long apical setae.

Male ( Fig. 1B ). Body length, 4.0 mm. Head ( Fig. 2C ). Dark brown, longer than wide; length, 0.40 mm; holoptic, interommatidial setae present, with length similar to facet width; dorsal and ventral ommatidia of similar size; three ocelli, mid ocellus smaller, lateral ocelli of similar size. Occiput pilose, with a lateral pair of sensillae. Labella short, setose. Maxillary palpus as long as labella, 0.11 mm long, covered with scattered setae and with an apical, broad, rounded sensory pit ( Fig. 2D ). Antenna uniformly brown except for dark brown pedicel, 0.35 mm long; scape as long as wide, pedicel subcylindrical, flagellum with 8 flagellomeres, flagellomere 1 with pale base, flagellomeres I–VII wider than long, more distal segments wider, flagellomere VIII club–shaped; scattered setae on each flagellomere, which are covered with microtrichia and sensilla. 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 high, 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 D–F). Dark brown, with same pattern as other species of group– scatopsiformis . Wing ( Fig. 4B ). Extending to sixth abdominal segment, 2.4 mm long, 0.9 mm wide. Membrane of all posterior cells covered with scattered macrosetae and microsetae; macrosetae present on all veins; Wing length/costal section 1, 2.7; WL/C2, 3.0; WL/C3, 3.3; C1+C2/WL, 0.69; C extending 0.69 of wing length; M 1+2 complete, basal portion of M 1 missing; M 2 and M 4 traceable to wing base; M 1, M 2, M 4 and CuA reaching wing margin, M 4 reaching wing margin beyond level of tip of R 4+5; CuA slightly curved towards base at proximal third, reaching wing margin at level of R 1. Haltere pale brown. Abdomen. ( Fig. 1B ). Dark brown. Tergite 7 wider than long ( Fig. 5B ), posterior margin slightly emarginated, with a row of thin setae apically, 0.40 mm long, 0.57 mm wide; sternite 7 ( Fig. 5D ) entirely separated into two lobes that join narrowly at level of basal, mostly unsclerotized region, 0.30 mm long, 0.25 mm wide. Terminalia ( Figs. 8 A–B, 9A–B). Laterally compressed, 0.67 mm long, 0.17 mm wide; gonocoxites reduced to a pair of slender bare stripes; gonostyles basally fused, midportion subquadrate anteriorly, distal portion slightly expanded subapically, with a distal digitiform process. Aedeagus well–developed, projecting medially beyond tip of gonostyles. Cerci setose.

Female. Similar to male, except for the following. Head ( Fig. 11C ), 0.37 long. Maxillary palpus ( Fig. 11D ),

0.10 mm long, with scattered setae and an apical, broad sensory pit. Antenna, 0.35 mm long. Wing, 2.2 mm long, 0.8 mm wide. Wing length/costal section 1, 2.9; WL/C2, 3.1; WL/C3, 3.2; C1+C2/WL, 0.66; C extending 0.66 of wing length. Abdomen. Tergite 7 ( Fig. 13D ) longer than wide, 0.70 mm long, 0.50 mm wide, posterior margin emarginated, with a pair of long lateral digitiform processes on posterior margin. Sternite 7 ( Fig. 13C ), 0.55 mm long, 0.50 mm wide, with a pair of distal lobes, posterior margin with V–shaped emargination, and a pair of long lateral digitiform processes on posterior margin. Spermatheca elongated ( Fig. 13 C–D), length 0.31 mm.

Distribution. Mexico (State of Mexico) (Nearctic area of Mexico) ( Fig. 14A ).

Etymology. The specific epithet is used in apposition as a reference to the Otumba region, in the state of Mexico.

Comments. This new species also belongs in the group– scatopsiformis and seems to be very closely related to Psectrosciara stradivarius Haenni & Rapp (2003) , from Belize, with very similar male genitalia. The most notable differences are in the midportion of the gonostyles, straight in P. stradivarius and subquadrate in P. otumba , and the reduced aedeagus in P. stradivarius , compared with P. otumba , which is well–developed, projecting medially beyond the tip of the gonostyles.

Figures

FIGURE 1. Habitus of males, lateral view. A. Psectrosciara ahuatla sp. nov. B. Psectrosciara otumba sp. nov. Scale = 0.5 mm.

FIGURE 2. Male head. A–B. Psectrosciara ahuatla sp. nov. C–D. Psectrosciara otumba sp. nov. A, C. Lateral view of head. B, D. Maxillary palpus. Scale = 0.1 mm.

FIGURE 3. Male. Legs, lateral view. A–C. Psectrosciara ahuatla sp. nov. D–F. Psectrosciara otumba sp. nov. A, D. Fore leg. B, E. Mid leg. C, F. Hind leg. Scale = 0.1 mm.Abbreviations: cx = coxa; fe = femur; tb = tibia; tr = trochanter; tsm 1 = tarsomere 1.

FIGURE 4. Male wing (dorsal view). A. Psectrosciara ahuatla sp. nov. Scale = 0.1 mm. B. Psectrosciara otumba sp. nov. Scale = 0.5 mm. Abbreviations: bM= base of medial vein; CuA = anterior branch of cubital veins; h = humeral crossvein; M 1, M 2 and M 4 = branches of medial vein; R 1, R 4+5 = radial veins; r−m = radial−medial; Rs= radial sector.

FIGURE 5. Male. Abdominal segments. A, C. Psectrosciara ahuatla sp. nov. B, D. Psectrosciara otumba sp. nov. A, B. Tergite 7, dorsal view. C, D. Sternite 7, ventral view. E. Abdominal segments, dorsal view. Scale = 0.1 mm. Abbreviations: tg 1 = tergite; tg 4 = tergite 4.

FIGURE 8. Male terminalia. Psectrosciara otumba sp. nov. A. Ventral view. B. Lateral view. Scale = 0.1 mm.

FIGURE 11. Female head. A–B. Psectrosciara ahuatla sp. nov. C–D. Psectrosciara otumba sp. nov. A, C. Lateral view of head. B, D. Maxillary palpus. Scale = 0.1 mm.

FIGURE 13. Female. Seventh abdominal segments. A, B. Psectrosciara ahuatla sp. nov. C, D. Psectrosciara otumba sp. nov. A, C. ventral view. B, D. dorsal view. Scale = 0.1 mm. Note figure B: The lower part corresponds to the tergite 7 of the female, attached in copula with the male terminalia, in the upper part of the figure. Abbreviations: ep = epandrium; p tg 7 = process of tergite 7; p st 7 = process of sternite 7; tg 7 = tergite 7; st 7 = sternite 7; spmth = spermatheca.

FIGURE 14. A. Distribution map of Psectrosciara ahuatla sp. nov. (solid circles) in the state of Guerrero (localities Acapulco and Nuxco) and Psectrosciara otumba sp. nov. (solid rectangle) in the state of Mexico (locality Coyotepec). B. Natural environment of the locality Coyotepec where Psectrosciara otumba sp. nov. was collected.