Nipponomyia Alexander, 1924

Kolcsar, Levente-Peter, Kato, Daichi, Gamboa, Maribet & Watanabe, Kozo, 2020, Revision of Japanese species of Nipponomyia Alexander, 1924 (Diptera, Pediciidae), ZooKeys 1000, pp. 71-105: 71

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Nipponomyia Alexander, 1924


Nipponomyia Alexander, 1924   Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9 , 10 View Figure 10 , 11 View Figure 11 , 12 View Figure 12 , 13 View Figure 13 , 14 View Figure 14 , 15 View Figure 15 , 16 View Figure 16 , 17 View Figure 17 , 18 View Figure 18 , 19 View Figure 19

Type species.

Tricyphona kuwanai   Alexander, 1913 by original designation in Alexander (1924): pages 158-159.

Descriptive notes on Nipponomyia   Alexander, 1924 based on Japanese species.

General coloration yellow to black, with or without conspicuous marking on thorax. Markings of body not differing significantly between sexes.

Head: Rostrum short. Eye appearing bare; however, a few small setae present between ommatidia, near to border of compound eye (Fig. 2A, B View Figure 2 ). Eyes widely separated. Antenna short in both sexes, only little longer than head. Scape 1.2-1.4 × longer and wider than pedicel. Pedicel 1.8-2.2 × wider than first flagellomere. Flagellum 11-13-segmented, evenly narrow toward apical segment. Flagellomeres oval to cylindrical, first 9 or 10 flagellomeres with 1 or 2 long, erected verticils dorsally (Fig. 2C, D View Figure 2 ). Last 3 or 4 flagellar segments with 3 or 4 verticils arranged irregularly. Last flagellar segment with 3 or 4 dark apical verticils, slightly curved upward, differing in shape to other verticils. Ventral part of flagellomeres densely covered with whitish sensilla, shorter than diameter of basal segment (Fig. 2E View Figure 2 ). Additional microtrichia on flagellomere (Fig. 2E View Figure 2 ). Palpi 5-segmented, length varying among species.

Thorax: Elongated in dorso-ventral direction (Fig. 3A, C View Figure 3 ). Cervical sclerite elongated fusiform. Pronotum well developed, medial part of antepronotum with hump and long setae; antepronotal lobe well developed, dorsal part slipping under medial part of antepronotum; postpronotum relative narrow. Prescutum with anterior part rounded, greatly protruding anteriorly, above to the pronotum in lateral view. Scutum usually with conspicuous spots. Presutural area of scutum without longitudinal suture, just with solid line of some long hairs (Fig. 3D View Figure 3 ); area under line of hairs before transverse suture bare in SEM photo ( N. trispinosa   ) (Fig. 3D View Figure 3 ); not evident under stereomicroscopes. Transverse suture deep, V-shaped, generally with dark patch in middle. Mediotergite elongated, dorsal margin almost straight in lateral view (Fig. 3A, C View Figure 3 ). Episternum, epimeron, and laterotergite each virtually not divided. Pit between episternum and epimeron deep (Fig. 3C View Figure 3 ). Meron relatively small, narrow in middle, forming two triangular parts, ventral one bigger. Metepisternum angular, additional divisions indistinct.

Legs: Longer in male than in female. Fore coxa elongated, extending ventrally beyond episternum. Tibia longest segment in both sexes. Male fore tarsomere 1 as long as fore femur or slightly longer. Tibial spur formula: 1, 2, 2, spurs just half length of width of tibia. Tarsomeres with 2 spurs. Male tarsomere 5 shorter than tarsomere 4. Female tarsomere 5 longer than tarsomere 4. Tarsal claw simple, without teeth, covered with small hairs on base, arolium present (Fig. 3E View Figure 3 ). Average relative lengths of each segment (in percentage %) to the total length of corresponding leg (100%) listed in Table 1 for both sexes.

Wing: General wing venation as in Fig. 4A View Figure 4 . Longitudinal veins with setae; crossveins bare. Sc long, ending beyond fork of Rs. Crossvein sc-r before origin of Rs and before or on same level as A2. Usually Rs forking into R2+3+4 and R5 (Fig. 4A-D, F View Figure 4 ) or rarely into R2+3 and R4+5 (Fig. 4E, G View Figure 4 ); highly variable within species. Crossvein r-m before fork of Rs, except in N. khasiana   Alexander, 1936. R1 and R3 approaching each other at position of R2. Cell r4 wider at middle. Usually cell d closed, longer than cell m2. Direction of crossvein m-m variable, usually almost perpendicular (Fig. 4A-E, G View Figure 4 ) or oblique (Fig. 4F View Figure 4 ). Anterior margin of wing with yellow band, bordered with different sized and shaped brown-black patches. Additional transverse markings (dashes, dots) in costal cell present in some species (Fig. 4B-E View Figure 4 ). Additional brown markings along veins, from fork of Rs to m-m and to m-cu (Fig. 4F, G View Figure 4 ).

Abdomen: Covered with relative long and dense hairs. Membranous area of second sternite well developed, shaped as in Fig. 3A, B View Figure 3 . Usually tergites and sternites each with longitudinal dark line on lateral side (Figs 8B View Figure 8 , 10B View Figure 10 , 14B View Figure 14 , 15B View Figure 15 , 18B View Figure 18 ) and/or with spots and transverse lines (non-Japanese species).

Male terminalia: Relatively simple. Tergite 9 (epandrium) and sternite 9 (hypandrium) fused; border indistinct, forming wide ring, bulging in ventral side (Figs 5E, F View Figure 5 , 11E, F View Figure 11 , 16E, F View Figure 16 , 19E, F View Figure 19 ). Tergite 9 simple without any lateral projections/arms. Gonocoxite well developed, stout, membranous on inner side. Basal lobe on ventral side of gonocoxite variable in size among species. Apical lobe of gonocoxite (sometimes referred to as outer gonostylus) partly separated from gonocoxite, elongated and directed dorso-ventrally, covered with short dark spines (Fig. 5A, B, G, H View Figure 5 ). Interbase long, well developed, fused with gonocoxite (Fig. 5G, H View Figure 5 ), with a few pale setae on ventral side. Gonostylus with two parts (Fig. 5B View Figure 5 ); inner (anterior) part of gonostylus always elongated, directed inwards; outer (posterior) part of gonostylus always shorter, wide (Figs 5G, H View Figure 5 , 11G, H View Figure 11 ) or slender (Figs 16G, H View Figure 16 , 19G, H View Figure 19 ) bearing 2-14 black spines. Aedeagus complex simple in shape as in most species of Pediciidae   ; difference among species more distinct in lateral view (Figs 5I, J View Figure 5 , 11I, J View Figure 11 , 16I, J View Figure 16 , 19I, J View Figure 19 ). Aedeagus complex fused with sternite 9; relatively hard to separate from it; fused part referred in this article as aedeagal guide. Shape and length of aedeagus variable among species.

Female terminalia, ovipositor: Elongated, tergites 8-10 fused (Fig. 6A, B View Figure 6 ). Pair of small pits situated between tergites 8 and 9. Tergite 8 at least twice as wide as tergite 9 in lateral view. Cercus longer than combined length of tergites 8-10. Cercus almost straight (Fig. 12C, E View Figure 12 ) or curving dorsally (Figs 6B View Figure 6 , 12A View Figure 12 ). Hypogynal valve dorsally with 5-7 strong setae pointing caudally, terminal seta well separated from penultimate one and situated laterally to anterior setae (Fig. 6B, C View Figure 6 ). Genital fork well-developed, spoon-like or cruciform. Pair of membranous invaginations ("interbase sheath") present on ventral side of genital fork, holding interbases during copulation (Fig. 7B View Figure 7 ). Sternite 9/genital plate with two sclerites lateral of genital fork, variable in shape and development among species and even within species (Figs 7A, B View Figure 7 , 12B, D, F View Figure 12 ). Pair of sclerotized (darker) area between genital fork and genital opening present in some species. Area around genital opening sclerotized, T- or Y-shaped; Three small, light brown spermathecae closely situated to genital opening (Figs 6D View Figure 6 , 7C View Figure 7 ). Sternite 10 rounded apically, with 5-10 longer hairs (Figs 6D View Figure 6 , 7B View Figure 7 , 12B, D, F View Figure 12 ).

Larva: Unknown.

Pupa: Unknown.


Eastern Palearctic and Oriental (Fig. 1 View Figure 1 ).


Adults swarm in the air close to the ground or above the vegetation, in shadow and windless conditions. They rest on ventral surfaces of substrates like leaves, spreading their wings horizontally, even during copulation. Nipponomyia kuwanai   and N. trispinosa   males walk fast on the vegetation and fly short distances to find females. Nipponomyia kuwanai   females were observed ovipositing in muddy, wet soil, near mosses on a mountain lakeshore. A N. trispinosa   female was observed searching for oviposition sites around wet soil, rich of organic matter next to a waterfall, but the oviposition has not yet been observed. Sometimes N. kuwanai   , N. trispinosa   , and N. pentacantha   inhabit the same habitat.