Leptomorphus amorimi Borkent, 2012

Borkent, Christopher J. & Wheeler, Terry A., 2012, Systematics and Phylogeny of Leptomorphus Curtis (Diptera: Mycetophilidae) 3549, Zootaxa 3549, pp. 1-117 : 15-16

2. Leptomorphus amorimi Borkent , new species

( Figures 3, 43, 92, 142, 150, 155)

DIAGNOSIS: The only extant species of Leptomorphus with the following combination of characters: Scutum and scutellum evenly covered with fine trichia; male foretibia with a dense row (comb) of short anteroventral bristles; palp segment 5 with thick covering of fine, white, setulae; male genitalia with gonocoxite arising ¼ of length of tergite 9 towards apex, gonocoxite with scalloped edge apicomedially, hook-like process laterally and short basomedial gonocoxal lobe bearing several long setae ( Fig. 92).

This species can be distinguished from the other Neotropical species without R 4 by the yellow tibia, brown metepisternum ( Fig. 3) and the shape of the gonocoxite ( Fig. 92).

DESCRIPTION: Male. Head: brown spot medially from ocelli to antennal base, remainder yellow, somewhat dorsoventrally compressed in anterior view. Antenna dark brown; scape yellow, with brown setae in double row at apex extending from dorsum laterally into thick patch covering apicoventral process, basal third and entire medial surface bare, anterobasal patch of setulae present; pedicel yellow, with 2 large bristles, few setae on apicodorsal margin, patch of fine setae apicoventrally; flagellomere 1 with tapered base brown remainder dark brown; flagellomere 6 1.2X as long as broad. Clypeus yellow, slightly laterally compressed oval; bristles on clypeus light brown, strong bristles on ventral half, smaller bristles on entire surface, all directed ventrally or medioventrally, clypeus 2.5X as long as face. Face yellow; shape a slightly wider than tall triangle, bare. Frons dark brown; bare, frontal furrow running 1/2 distance from dorsal margin towards ventral margin, frontal cleft more than 1X diameter of median ocellus anterior of median ocellus. Palpus with segments 1–4 yellow, segment 5 white; segment 1 small but visible below eye, segments increasing in length, segment 5 2X length and 1.5X width of segment 4 with even width from base to apex and covered in fine white setulae, segment 3 with very small lateral patch of fine setae encircled by dark setae. Labellum yellow. Eye with very few, short inter-ommatidial setulae scattered on surface. Occiput yellow with appressed, anteriorly directed setae. Three ocelli in straight line, space between ocelli less than diameter of laterals, lateral ocelli 2X their own diameter from eye margin, ocellar triangle dark brown/black. Thorax: Length 1.97 mm (n = 1). Dark brown with yellow lateral spots. Scutum dark brown/black with blue-green specks, pair of small yellow anterolateral spots; surface of scutum covered with trichia; acrostichal setae absent; single dorsocentral seta present anteriorly; two thirds row of lateral setae present; patch of setae on scutum at wing base small. Scutellum dark brown with covering of fine trichia; bristles absent. Prescutum brown. Mediotergite dark brown with 4 bristles on posterolateral corners, and covering of appressed trichia. Laterotergite brown, with covering of appressed trichia; anterior margin of laterotergite abutting katepisternum. Anepimeron brown with posterodorsal corner yellow. Anepisternum brown. Katepisternum brown with posterodorsal corner yellow. Antepronotum and proepisternum brown. Margin of anterior and posterior spiracles yellow with yellow trichia. Metepisternum yellow with light brown dorsal line. Anapleural suture with anterior portion slightly curved dorsally. Halter with basal 1/3 of stem ivory, apical portion and knob dark brown. Legs: principally yellow; fore- and midcoxa with anterior surface brown, hind coxa dark brown except for posterior surface; mid- and hind trochanter light brown; hind femur with basal 1/3 dark brown; extreme anteroapical corner yellow on forefemur, on other femora dark brown; midfemur without apical spine-like process. Tibia with covering of yellow macrotrichia, foretibia with strong, double, comb of short setae along length of anteroventral surface, tibial spurs yellow, foretibial spur length 1.7X apical thickness of foretibia, midtibia with strong, dorsal, bare patch of even thickness for 2/3 of its length, placed basally, shortest midtibial spur 0.9X length of longest, longest midtibial spur 4X apical thickness of midtibia, shortest hind tibial spur subequal to length of longest, longest hind tibial spur 3.4X apical thickness of hind tibia. Foreleg first tarsomere 1.7X length of foretibia. Wing ( Fig. 43): Length 7.5 mm (n = 1). Hyaline; apical macula dark brown, running from anterior to posterior wing margin, beginning halfway along R 5 but not reaching wing tip; medial macula extending from R 1 to posterior wing margin (fainter on posterior third). Macrotrichia in all cells, though absent from posterobasal margin of cell a, and very sparse in basal cells. Setae on basal posterior margin of wing (along base of cell a) alternating long, short. Calypter with a few short setae. Vein sc-r present, apical end before origin of Rs. R 4 absent. R 5 slightly concave for entire length. M 1 reaching apex before R 5, apices of M veins thinning towards wing margin. M 4 -CuA fork arising before origin of r-m. A 2 faintly present as crease. Abdomen: Tergites principally brown to dark brown, T2–5 with parellel yellow lines, T3–5 also with anterior yellow band. Tergite 8 smaller than all other abdominal sclerites, with 1 bristle on each apicolateral corner. Genitalia ( Fig. 92): brown. Sternite 9 sclerotized anteriorly pointing isoceles triangle with posteromedial indentation, 1/5 the width of the genitalia, not reaching gonocoxal margin. Tergite 9 subcircular with short apicolateral lobe on each side bearing several points and medial U-shaped indentation. Gonocoxite placed 1/4 way toward apex of T9 with scalloped edge apicomedially, hook like process laterally and gonocoxal lobe emerging mediobasally and bearing several long setae aically, medial margin not reaching medial line, bearing gonostylus on apical 1/3. Gonostylus a single broad-based lobe tapering to a point apically with small setae basally, gonocoxite III fused to dorsolateral margin. Aedeagus equal in length to gonocoxite, tapering to middle and then slightly bulbous apically, apodemes 1/3 total length. Parameres a slightly curved taper, 1.5X length of apodemes, apodemes with a basal hook-shaped spine pointing dorsally.

Female. ( Fig. 3) As for male, except as follows. Thorax: Length 2.01 mm (n = 1). Metepisternum brown. Wing: Length 8.3 mm (n = 1). Legs: foretibia without strong, double, comb of short setae along length of anteroventral surface. Abdomen: Cercus yellow.

Immatures. Unknown.

BIOLOGY: Unknown.

DISTRIBUTION: Southern Brazil ( Fig. 142), 25–825 masl.

ETYMOLOGY: This species is named for Dr. Dalton de Souza Amorim, in thanks for his help in providing specimens and information, and for his encouragement and many discussions during this study.

MATERIAL EXAMINED: Holotype: here designated, adult male, pinned with genitalia in plastic vial on pin, labelled “Neudorf, [26.368°S, 48.985°W] Sta / Catarina / Brazil, 10–XI; F. Schade / collector; HOLOTYPE ♂ / Leptomorphus amorimi / Borkent, new species / Det. C.J. Borkent 2012” [ MCZ]

Paratype: BRAZIL, Santa Catarina, Nova Teutonia , v.1964, F. Plaumann. (1♀, CNC) .