Lygistorrhina (Probolaeus) maculipennis, Blagoderov & Pollet, 2020

Blagoderov, Vladimir & Pollet, Marc, 2020, Diversity of Lygistorrhina (Probolaeus) Williston, 1896 (Diptera: Keroplatidae, Lygistorrhininae) of Mitaraka (French Guiana), with descriptions of three new species, Zoosystema 42 (30), pp. 593-606 : 595-596

Lygistorrhina (Probolaeus) maculipennis n. sp.

( Figs 1A , 2A , 3A,B , 4A, B , Table 1 )

urn:lsid:zoobank.org:act:74CF7A8A-8425-4E79-84FE-8D161FA3B61B

TYPE MATERIAL. — Holotype. French Guiana • ♂; Mitaraka , different sites nr base camp and along trails; tropical moist forest (different sites); 14.III.2015; SLAM; Julien Touroult & Eddy Poirier leg.; MITARAKA/191; mounted in Euparal on slide; MNHN-ED-ED10672 ; MNHN.

Paratypes. French Guiana • ♂; same data as holotype; 25.III.2015; SLAM; Julien Touroult & Eddy Poirier leg.; MITARAKA/190; in alcohol; MNHN-ED-ED10673; MNHN • 1 ♂; nr MIT-A-RBF1 (river); 24.III.2015; MT(6 m); Julien Touroult & Eddy Poirier leg.; MITARAKA/193; in alcohol; NMS-10003793 ; NMS .

DIAGNOSIS. — Wing with a small dark spot at the tip; Sc ends free. Thorax brown with pronotum and dorsal part of katepisternum yellow; fore coxa yellow, mid and hind coxa brown; metepimeron longer than hind coxa. Abdominal tergites and sternites 1-6 with a pale-yellow apical band; gonostyli slightly expanded at the tip.

ETYMOLOGY. — The name of this species refers to its infuscate wing apex.

DESCRIPTION

Male

General coloration. Dark brown ( Fig. 1A ); measurements, see Table 1 .

Head. Rounded, dichoptic. Vertex slightly convex. Rounded ommatidia with subequal diameter, interocular setae subequal to ommatidial diameter. Three ocelli arranged almost in a straight line, with median ocellus slightly anteriad of two lateral ocelli. Antenna light brown, flagellomeres 1-6 yellow ( Fig. 1A ); antenna shorter than hind femur, length: 0.9-1.1 mm; 14 flagellomeres, with strong dorsal setae (flagellomeres 1-6: one pair, flagellomeres 7-14: two pairs), subcylindrical, gradually tapering; length of flagellomeres 1-6 1.3-1.6× their width, and 2-4× in flagellomeres 7-14. Face longer than wide. Clypeus with straight ventral edge. Palpus length 1.1 mm, tapering towards apex, with a simple row of long setae. Hypopharynx length 1.5 mm; labellum slightly longer.

Thorax. Brown, with antepronotum, prosternum, anepimeron, dorsal parts of anepisternum and katepisternum, and anterodistal part of mesonotum yellow. Scutum irregularly setose. Scutellum rounded, with 4-6 posterior setae. Antepronotum and proepisternum with 4-5 setae each. Laterotergite lobed, with a row of 13-14 setae. Hind coxa shorter than both metepimeron and laterotergite.

Legs. Fore coxa pale-yellow, in some specimens with dark brown basal part; mid and hind coxa completely dark brown, mid coxa with indistinct light brown spot in the centre. Remainder of fore and mid legs yellow; hind femur pale-yellow basally, dark brown in distal 1/3-1/2; hind tibia brown in distal half; hind tarsus brown.Tibiae irregularly setose. Claws of fore and mid legs curved, apically blunt, with a small incision at apex; claw of hind leg setiform, straight and pointed.

Wing ( Fig. 2 A). Membrane hyaline, densely covered with microtrichia; with indistinctly rounded infuscate area at the tip posterior of R 5, not reaching M 1. Sc short, ending free; R 1 at the level of CuA tip; C extending to half the distance between tips of R 5 and M 1. C, R 1 and R 5 with dark setae, rest of the veins bare; M 1, M 2 and M 3+4 almost straight; CuA curved posteriorly, sometimes inconspicuously sinusoid. Anal lobe well developed. Halter white, same length as first abdominal segment.

Abdomen. Dark brown. Segments 1-6 with pale-yellow transversal band in posterior part, occupying 20-30% of segment length; last two segments and terminalia entirely dark brown.

Terminalia ( Figs 3A, B , 4A, B ). Tergite 9 parallel-sided, apex somewhat rounded, with dense unequal short spines. Sternite 9 oval, parallel-sided, with evenly rounded tip. Gonostyli expanded at tip; apical tooth scoop-shaped. Aedeagal complex (tegmen sensu Huerta et al. 2019) moderately sclerotised, rounded, wider than long. Aedeagal apodeme short, directed laterally, not extending width of aedeagal complex. Spines on 9 th tergite and setae on gonostylus gradually denser towards apex.

COMPARISON

Free Sc is present as well in L. brasiliensis Edwards, 1932 , L. barrettoi Lane, 1947 , L. sanctaecatherinae Thompson, 1975 , and L. cerqueirai Lane, 1958 . However, the first three species have wings completely hyaline, without infuscation, and also differ from L. maculipennis n. sp. in the pattern of abdominal markings. L. cerqueirai has abdominal segments 1-6 with pale apical bands similar as the new species, but has a very different pattern of wing spots. In addition, L. cerqueirai has a single dorsal seta on each flagellomere, Costa extends to almost 2/3 of distance between R 5 and M 1, laterotergite and metepimeron are shorter than hind coxa, and M 1 and CuA are conspicuously bent anteriorly and sinusoid.

REMARK

Specimen NMS-10003793 is darker, with thorax and coxae completely dark brown except for extreme tip of fore coxa; abdominal segment 6 has a slightly lighter coloration than the rest of the segment, but the genitalia are of the same structure as the other specimens included in the type series.

Figures

FIG. 1. — Habitus of new species of Lygistorrhina (Probolaeus) Williston,1896:A, Lygistorrhina maculipennis n. sp., with detached head in separate box; paratype MHNH-ED-ED10673; B, Lygistorrhina conica n. sp., paratype NMS-10003795; C, Lygistorrhina mitarakensis n. sp., paratype NMS-10003799. Scale bar: 1 mm.

FIG. 2. — Wings of new species of Lygistorrhina (Probolaeus) Williston, 1896. A, Lygistorrhina maculipennis n. sp.,holotype MNHN-ED-ED10672; B, Lygistorrhina conica n. sp.,paratype MNHN-ED-ED10681; C, Lygistorrhina mitarakensis n. sp., holotype MNHN-ED-ED10691. Scale bar: 0.2 mm.

FIG. 3. — Male genitalia of new species of Lygistorrhina (Probolaeus) Williston, 1896: A, B, Lygistorrhina maculipennis n. sp., holotype MNHN-ED-ED10672; C, D, Lygistorrhina conica n. sp., holotype MNHN-ED-ED10674; E, F, Lygistorrhina mitarakensis n. sp., MNHN-ED-ED10691; A, C, E, dorsal view; B, D, F, ventral view. Scale bar: 50 µm.

FIG. 4. — Aedeagal complex of new species of Lygistorrhina (Probolaeus) Williston, 1896: A, B, Lygistorrhina maculipennis n. sp., holotype MNHN-ED-ED10672; C, D, Lygistorrhina conica n. sp., holotype MNHN-ED-ED10674; E, F, Lygistorrhina mitarakensis n. sp., holotype MNHN-ED-ED10691; A, C, E, dorsal view; B, D, F, ventral view. Scale bar: 20 µm.