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Classification
Lygistorrhina fijiensis Evenhuis, 2008
- Distribution after:
Lygistorrhina fijiensis (after Evenhuis, 2008)
Diagnostic description:Most similar in appearance to the African L. legrandi Matile by virtue of the solid infuscation at the apex of the wing but can easily be separated from it by the concolorous antennal flagellomeres (some flagellomeres contrastingly black in L. legrandi) and the different male genitalic characters. This species also differs from the other species of Lygistorrhina with pictured wings that are hyaline at the apex (L. pictipennis, L. cincticornis, and L. chaoi) by the concolorous antennal flagellomeres (these flagellomeres with contrasting black subapical segments in L. pictipennis, L. cincticornis, and L. chaoi).
Three of the five species of Lygistorrhina with pictured wings (L. pictipennis, L. cincticornis, and L. chaoi) have the apex of the wing with hyaline spots and are found clustered in the eastern Asian region (Borneo, Taiwan, and Japan). In contrast, Lygistorrhina fijiensis and the tropical African L. legrandi have the apex of the wing solidly infuscate and therefore appear more similar to each other than to the Asian group. An additional undescribed species is known to the senior author from Sulawesi (single male specimen in BPBM) that also has a similar pictured wing pattern that fits with the L. legrandi and L. fijiensis group.
Morphology:Male. Head. Medial portion of occiput, vertex, and frons dark brown to black, clypeus and labrum shiny brown, remainder of head brown to pale brown; three ocelli, median ocellus slightly smaller than lateral ocelli; eyes large, globular, taking up much of head; proboscis length subequal to fore coxa and femur combined. Antennae unicolorous pale brown to yellow, scape and pedicel with short stiff hairs apically; flagellomeres with short stiff hairs on lateral and dorsal surfaces, short fine hairs on ventral surface, medial surface generally bare; first flagellomere cylindrical, length 2 times width, flagellomeres 2–13 squarish, length subequal to width, flagellomere 14 blunt cylindrical, length ca. 1.5 times width, tip rounded.
Thorax. Brown throughout; mesoscutum with minute hairs anteriorly and dorsally; proepimeron with four setae; laterotergite with row of setae caudally; halter stem and knob white.
Legs. Coxae and fore and mid femora brown; fore coxa with row of 6–8 short stiff hairs anteriorly; mid coxa with transverse row of 4–5 stiff hairs apically; hind coxa with 2 short setae subapically; hind femur 1.5 times length of mid femur, swollen on apical half, greatest width subapically, hind femur yellow to yellowish brown with brown to dark brown on apical one-third; tibiae yellow basally, brown apically, setulae in regular rows; hind tibiae narrow basally, gradually becoming wider apically to apex where width subequal to femur; tibial spurs 1:2:2; spurs short on fore and mid tibiae, long on hind tibia, length of tibial spurs on hind leg ca. 1/4 length of hind basitarsus; tarsi brown, with typical setulae and hairs; fore and mid claws pale brown long, slender with basal tooth ca. one-third length of claw; hind claws black, short, thick, with rudimentary subbasal tooth.
Wing. Suffused pale yellowish brown throughout with contrasting brown pattern as follows: two transverse bands from costa to posterior margin of wing (darkest at costa): one at apical 1/5 of wing from end of vein R5 to anterior edge of vein M2; second from costa at about apical third posteriorly to anterior edge of vein M3+4. Brown spot also at apex of vein CuA1 and pale brown spot in apical one-third of anal cell. Sc incomplete. Basal portions of M1, M2 and M3+4 effaced, M1 slightly sinuous to wing margin.
Abdomen. Extremely long, thin; dark brown to black with yellow to white on posterior margins of segments II-VI; tergite I bare on anterolateral two-thirds, with short black hairs elsewhere; abdominal segments II-VII (tergites and sternites) with sparse short black hairs evenly distributed except bare on yellow to white areas.
Genitalia. Hypopygium brown with apical 2/3 of gonostyli pale yellow with brown apex. Gonocoxites with sparsely distributed stiff setae; gonostylus porpoise-head shaped apically, densely pilose on inner margin, with short, stiff hairs on outer apical surface; typical subbasal long seta present on inner margin; additional long seta present at about mid-length on inner margin. Tergite 9 with dense spikey, villa-like setation along caudal margin, strong setae sparsely distributed throughout dorsal surface.Female. As in male except as follows: Head with eyes much smaller, spherical, not globular; occiput and vertex much more prominent, predominantly black with pale brown along inner eye margins; occiput and vertex sparsely black setose. Abdomen thicker than male, all brown; tergites with yellow on anterolateral portion of segments III–VI; sternites with small yellow spots on apical portions of segments III–VI. Genitalia not dissected; cerci rounded apically, pale yellow.
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