Forcipomyia (Metaforcipomyia) rursa Spinelli, Marino & Borkent, 2012, n. sp.
Creators: name: Spinelli, Gustavo R.
name: Marino, Pablo I.
name: Borkent, Art
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Ceratopogonidae
Forcipomyia
Forcipomyia rursa

description: Forcipomyia (Metaforcipomyia) rursa n. sp.
(Figs. 72–81, 115, 142)
Diagnosis. Male: only species of Neotropical Forcipomyia (Metaforcipomyia) with a hind tarsal ratio of 2.07–2.38, hind tarsomere 1 brown, wing with a dark patch on its anterior margin and at the apices of M2, CuA1 and CuA2, plume brown, parameres present and posterior margin of aedeagus with apical lobes separated by a very shallow gap. Female: only species of Neotropical Forcipomyia (Metaforcipomyia) with the spermathecae elongate, unequal in size.
Description. Male. Head. Brown. Eyes abutting medially for length of four ommatidia. Antenna (Fig. 72) with plume setae well developed, flagellomere 10 1.45–1.75 (1.59, n = 20) X longer than flagellomere 11, 10–13 elongate; flagellomere 13 with apical nipple, slightly constricted basally; AR 1.02–1.18 (1.09, n = 20). Palpus (Fig. 73) brown; segment 3 slightly swollen proximally, with shallow sensory pit opening at midlength; PR 2.27–2.70 (2.44, n = 20). Labrum tapering apically.
Thorax. Brown except scutellum, postscutellum dark brown; scutellum with aproximately 8 strong setae. Legs pale brown except tarsomeres 2–5 slightly paler; apex of hind tibia with 4 spines; tarsomeres with pectinate scales; tarsomere 1 of foreleg with row of 14 spine-like bristles, tarsomere 1 of hind leg with two rows of thick setae; foreleg TR 2.42–2.89 (2.67, n = 20), midleg TR 1.83–2.20 (2.04, n = 20), hind leg TR 2.07–2.38 (2.22, n = 20); claws curved, moderately stout. Wing (Figs. 74, 115) with pattern of pigmented membrane, with dark patch on its anterior margin and at the apices of M2, CuA1 and CuA2; distribution of macrotrichia showing two light spots in r3, one behind of second radial cell, one subapical, faint distal light spots in m1 and distinct light spots in m2, cua1 and anal cell; M2 only visible at wing margin; intercalary vein not visible; first radial cell obliterated, second well developed; fork of cubitus situated proximad to level of apex of costa; wing length 0.90–1.28 (1.09, n = 20) mm; breadth 0.34–0.44 (0.37, n = 20) mm; CR 0.42–0.45 (0.44, n = 20). Halter whitish.
Abdomen. Tergites uniformly brown. Genitalia (Fig. 75): Brown except gonostyli pale. Tergite 9 short, only extending to 1/3 length of gonocoxite; posterior margin broadly rounded; cercus lobe-like, slightly produced beyond midlength of gonocoxite; sternite 9 broad, with posterior margin slightly concave. Gonocoxite slender, 2.15 X longer than greatest breadth; gonostylus 0.85 length of gonocoxite, nearly straight, tip pointed. Parameres represented by a posteromesally directed projection slender apically, arising from the distal portion of the nearly straight gonocoxal apodemes. Aedeagus (Fig. 76) stout, shield-shaped, as long as broad, with two narrow posterior sclerotizations, posterior margin broad with apical lobes well developed, separated by a narrow gap; basal arch extending to 1/5 of total length; lateral arms nearly straight.
Female. As for male, with following differences; antenna pale brown with flagellomeres 1–4, vasiform, longer than broad; 5–8 bottle-shaped; flagellomeres 9–13 elongate, proportions as shown in Fig. 77; AR 0.74–0.86 (0.79, n = 14). Palpus (Fig. 78) pale; segment 3 slightly swollen proximally with irregular, shallow sensory pit opening at midlength; segments 4, 5 completely fused, slightly shorter than segment 3; PR 1.92–2.50 (2.25, n = 15).
Thorax. Legs pale brown, foreleg TR 2.44–2.89 (2.69, n = 15), midleg TR 1.91–2.22 (2.10, n = 15), hind leg TR 2.09–2.55 (2.27, n = 15), claws curved. Wing (Fig. 79) with first radial cell reduced; second radial cell narrow; wing length 0.92–1.22 (1.08, n = 13) mm; breadth 0.38–0.54 (0.46, n = 8) mm; CR 0.45–0.48 (0.47, n = 13). Abdomen. Tergites brown. Genital sclerotization (Fig. 80) closed, anterior margin rounded. Two spermathecae (Fig. 81) elongate, heavily sclerotized, with moderately slender, short necks, unequal in size, measuring 0.056 by 0.032 mm, neck 0.006 mm, and 0.042 by 0.028 mm, neck 0.004 mm. Cercus brown.
Distribution. This species is known only from higher elevations in Costa Rica, from 1100–2959 meters (Fig. 142).
Taxonomic discussion. Males and females were collected together at the same locality and date at the type locality. This species is similar to F. pseudocerifera. Characters to distinguish female and male of both species may be found under the discussion of F. pseudocerifera.
Forcipomyia rursa is also very similar to F. albipluma. The male of the latter species is readily distinguished from F. rursa by flagellomere 10 being 1.80–2.00 X longer than flagellomere 11, and by the paler flagellomeres 2–9 and plume. Characters to distinguish the females of both species may be found in the key.
Type material. Holotype male on microscope slide, labeled “ HOLOTYPE Forcipomyia (Metaforcipomyia) rursa Spinelli, Marino and Borkent, Costa Rica, Tapantí NP, 8 km SE Orosí, 1200 m, 11-XII-1999, A. Picado – A. Borkent, 193200N/560200E, CD 5032” (CNCI). Paratypes, 43 males and 30 females (1 male, 2 females, USNM; 2 males, 2 females, MLPA; 6 males, 6 females, CNCI; 34 males, 20 females, INBC) as follows: same data as holotype, 2 females, CD 5032 (CNCI). Costa Rica, Limón prov., P. Int. La Amistad, Valle del Silencio, zona de acampar, 2400 m, 16-IX / 16-XI-2001, D. Rubí, Malaise tp., 5 males, 2 females (INBC). Costa Rica, Limón prov., Valle del Silencio, Send. Ref. a Hoffman, 2453 m, 20-IX / 5-X-2003, Rubí, González, Delgado & Alfaro, Malaise tp., 2 males, 1 female (CNCI). Same data except Send. a Hoffman, 2475 m, 2 males, 2 females (MLPA). Costa Rica, Limón prov., PILA., Valle del Silencio, Área abierta, 2484 m, 20-IX / 5-X-2003, Rubí, González, Alfaro & Delgado, Malaise tp., 5 males, 2 females (INBC). Costa Rica, Limón prov., PILA., Valle del Silencio, Alrededor del Refugio, 2460 m, 19-VI / 5-VII-2003, Rubí, González, Delgado & Alfaro, Malaise tp., 1 female (INBC). Same data except 2480 m, 20/ 26-IX-2003, Amarilla tp., 1 female (INBC). Costa Rica, Limón prov., PILA., Ref. Valle del Silencio, 2460 m, 17-III / 2-IV-2003, González, Delgado, Alfaro & Rubí, Malaise tp., 1 male, 2 females (USNM). Costa Rica, Limón prov., Send. a Cerro Hoffman, 2460 m, 17-III / 2-IV-2003, González, Rubí, Delgado & Alfaro, Malaise tp., 1 male (INBC). Costa Rica, Limón prov., PILA., Send. Toma de Agua, 2460 m, 19-VI / 4-VII-2003, González, Rubí, Delgado & Alfaro, intersection tp., 2 males, 1 female (INBC). Same data except 20-IX / 5-X-2003, Malaise tp., 1 male, 1 female (CNCI). Same data except 2450 m, 27-VI-2003, luz mercurio/balde, 5 males, 5 females (INBC). Costa Rica, Guanacaste prov., Macizo Miravalles, Est. Cabro Muco, 1100 m, 22/IX-5-X-2003, J. D. Gutiérrez, Malaise tp., 1 female (INBC). Same data except 24/IX-5-X-2003, B. Hernández, 1 female (INBC). Same data except 27/ 29-IX-2003, luz mercurio/balde, 1 female (INBC). Costa Rica, Cartago prov., Tapantí NP, Paraíso, Orosí, no date, M. Alfaro, CD 5043, 2 males (INBC). Costa Rica, Cartago prov., Tapantí, río Dos Amigos, 1500 m, 3- VI / 6-VII-1995, R. Delgado, Malaise tp., CD 5180, 1 male (INBC). Costa Rica, Cartago prov., Sector La Represa, costado Torre ICE entre ríos Porras y Villegas, 1800 m, III-1997, R. Delgado, Malaise tp., CD 5166, 1 male (INBC). Costa Rica, Cartago, Tapantí NP, La Represa Torre ICE entre ríos Porras y Villegas, 1800 m, VIII-1997, R. Delgado, LS – 560100N/186150E, #47549, CD 5016, 1 male (INBC). Same data except I-1999, LS – 186150N/ 160100 E, #47544, CD 5013, 4 males, 1 female (INBC). Costa Rica, San José prov., Madre Selva, Fca. Los Lagos, 2000–2600 m, IX/ X-1995, M. M. Chavarría, CD 5046, 4 males, 3 females (INBC). Costa Rica, San José prov., Est. Santa Elena, 1850 m, 6-VII / 6-VIII-1997, Alfaro – Segura, CD 5073, 1 male, 1 female (INBC). Costa Rica, San José prov., ACLA-P., Pérez Zeledón, Chirripó NP, Est. Santa Elena, Send. El Llano, 1800 m, 28-X / 27-XI-1996, E. Alfaro, Manual (red, libre), CD 5151, 1 male (INBC). Costa Rica, Puntarenas prov., Potrero Grande, Send. Cerro Kasir, 2959 m, 19-VII-2000, A. Picado, CD 5333, 1 male (in Chusquea) (INBC). Costa Rica, 15 km N. San Isidro, Avalon Reserva Privada, 2250 m, 11/ 12-III-1999, A. Borkent, trampa de luz, CD 5001, 1 male, 1 female (CNCI). Same data except 13/ 14-III-1999, CD 5002, 2 males, 1 female (CNCI).
Derivation of specific epithet. The name rursa (reverse) refers to the contrast between dark tarsomere 1 and the pale tarsomeres 2–5 of adults of this species.
description: Published as part of 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), pp. 1-52 in Zootaxa 3419 on pages 24-27, DOI: 10.5281/zenodo.215031