Forcipomyia (Metaforcipomyia) grandiseta, Spinelli, Gustavo R., Marino, Pablo I. & Borkent, Art, 2012

Spinelli, Gustavo R., Marino, Pablo I. & Borkent, Art, 2012, A revision of Biting Midges of the Subgenera Forcipomyia (Metaforcipomyia) and F. (Saliohelea) from Costa Rica (Diptera: Ceratopogonidae), Zootaxa 3419, pp. 1-52: 16-18

publication ID 10.5281/zenodo.215031

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Forcipomyia (Metaforcipomyia) grandiseta

n. sp.

Forcipomyia (Metaforcipomyia) grandiseta  n. sp.

( Figs. 46–51View FIGURES 46 – 51, 112View FIGURES 112 – 115, 141View FIGURES 140 – 141)

Diagnosis. Male: only species of Neotropical Forcipomyia (Metaforcipomyia)  with a hind tarsal ratio of 2.17–2.20, flagellomere 10 1.10–1.35 X length of flagellomere 11, tarsomere 2 of the foreleg with thick, reinforced setae, and parameres present. Female: unknown.

Description of male. Head. Brown. Eyes abutting medially for length of 4–5 ommatidia. Antenna ( Fig. 46View FIGURES 46 – 51) pale brown with plume setae well developed, flagellomeres 2–4 spherical, flagellomere 10 1.10–1.35 (1.20, n = 3) X longer than flagellomere 11, flagellomeres 10–13 elongate; flagellomere 13 with apical nipple, slightly constricted basally; AR 1.17–1.32 (1.25, n = 3). Palpus ( Fig. 47View FIGURES 46 – 51) pale brown; segment 3 slightly swollen at midlength, with shallow sensory pit opening at midlength; PR 2.27–2.45 (2.37, n = 3). Labrum tapering apically.

Thorax. Uniformly dark brown; scutellum with approximately 8 strong setae and numerous minor ones. Legs brown, apex of hind tibia with 5 spines; tarsomeres 1–5 brown although progressively paler with pectinate scales; tarsomere 1 of foreleg with row of reinforced setae, tarsomere 2 of foreleg with 3–4 thick, basally setae ( Fig. 48View FIGURES 46 – 51), tarsomere 3 of foreleg with one setae weaker that latter ones, tarsomere 1 of hind leg with two rows of spine-like bristles; foreleg TR 2.50–2.60 (2.55, n = 3), midleg TR 2.10–2.37 (2.23, n = 2), hind leg TR 2.17–2.20 (2.18, n = 3); claws curved, moderately stout. Wing ( Figs. 49View FIGURES 46 – 51, 112View FIGURES 112 – 115) with abundant scales on costa, membrane infuscated with at most a dark patch on anterior margin of wing, distal to apex of radial cells; M 2 poorly visible at base; first radial cell obliterated; second radial cell well developed; fork of cubitus situated at level of apex of costa; wing length 0.80–1.02 (0.90, n = 3) mm; breadth 0.26–0.32 (0.28, n = 3) mm; CR 0.44 (0.43–0.45, n = 3). Halter whitish.

Abdomen. Tergites brown. Genitalia ( Fig. 50View FIGURES 46 – 51): Dark brown except gonostyli pale. Tergite 9 short, only extending to 1 / 4 length of gonocoxite; posterior margin nearly straight; cercus lobe-like, produced beyond midlength of gonocoxite; sternite 9 broad, with posterior margin with shallow posteromedian excavation. Gonocoxite stout, 1.80 X longer than greatest breadth; gonostylus 0.85 length of gonocoxite, almost straight, tip blunt. Parameres represented by a pointed posteromesally directed projection, gonocoxal apodemes slightly concave. Aedeagus ( Fig. 51View FIGURES 46 – 51) stout, shield-shaped, lateral margins heavily sclerotized, posterior margin broad, with two apical lobes well developed, separated by narrow gap; basal arch low, heavily sclerotized; lateral arms nearly straight.

Female. Unknown.

Distribution. This species is known only from southern Costa Rica at 3–1320 meters ( Fig. 141View FIGURES 140 – 141). The male from 3 km E of Cahuita was swept from a swamp forest just NW of the camping area in Cahuita National Park.

Taxonomic discussion. The reinforced setae on fore tarsomere 2 are shared with F. longiflagellata  , and F. macroseta  . Characters to distinguish all three species may be found in the key.

The aedeagus of this species is very similar to F. ronderosae  , but in the latter species the apex of the aedeagus is concave.

Type material. Holotype male on microscope slide, labeled “ HOLOTYPE Forcipomyia (Metaforcipomyia) grandiseta Spinelli, Marino and Borkent  , Costa Rica, Puntarenas prov., Golfito, Estación Agujas, 250–350 m, 15 - VI / 15 -VII- 1999, J. Azofeifa, Malaise tp. LS 276750View Materials 526550 # 52838, CD 5156 ” ( INBC). Paratypes, 2 males as follows: Costa Rica, 3 km E Cahuita, 29 -X- 1993, A. Borkent, CD 1641, 1 male ( CNCI). Costa Rica, Puntarenas prov., Coto Brus, Progreso, Fca. Cafrosa, 2 km al NNE de la Escuela de Progreso, 1320 m, 23 -XI- 1995, M. Chinchilla, LS 318900View Materials N/ 595630 E # 7473, CD 5025, 1 male ( MLPA).

Derivation of specific epithet. The name grandiseta  – grand (large) seta refers to the stout setae on the foretarsomere 2 of the adult males of this species.



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