Oidardis maculiseta, Cezar, Lucas A., Fisher, Eric M. & Lamas, Carlos J. E., 2013

Cezar, Lucas A., Fisher, Eric M. & Lamas, Carlos J. E., 2013, Four new species of Oidardis Hermann, 1912 (Diptera, Asilidae, Laphriinae, Atomosiini) from two major faunistic surveys in the Atlantic Rainforest, ZooKeys 350, pp. 47-74 : 60-64

Oidardis maculiseta sp. n. Figures 1 E–F, 2C, 3C, 4C, 5C,6 G–I,7C,8A,10

Diagnosis.

Leg color pattern: coxae yellow, femora dark-brown dorsally and tibiae yellow dorsally; facial pollinosity golden. Male with dark-brown modified tibial seta, as long as femur, golf-club-shaped with apical 1/4 as a large white lamella with black spot at apex; mid prong of the phallus much longer than lateral prongs; mystax short.

Description.

Holotype. Male. Body shiny black. Total length, excluding antennae, 5.4 mm; length of thorax, 1.3 mm; length of wing, 4.7 mm; greatest width of abdomen, 1 mm.

Head, laterally. Face, between antennal insertion and gibbosity, plane with eye margin; gibbosity slightly prominent, equals ventral 0.26 of face height; dorsal occipital setae dark-brown, lateral occipital setae white, ventral occipital setae white; proboscis 0.48 × the height of head, with numerous white macrosetae ventrally; palpus dark-brown, with yellow setae apically. Antenna. Antenna 0.85 × as long as the height of eye, entirely dark-brown, with dark-brown setae and macrosetae; antennal insertion at dorsal 0.2 of head height; scape slightly longer than pedicel, with medium-sized ventral seta, numerous short setae on a row around the segment; pedicel round; postpedicel elongate, 2.1 × length of basal two segments, brown-pollinose, except for silvery-yellow pollinosity on elliptical sensorial area on inner face, with dorsal spine subapical (3/4 length of postpedicel or beyond). Head, anteriorly. Head 1.35 × as wide as high; face 0.17 × as wide as head, golden-pollinose; mystax short, comprised of 10 golden macrosetae, and few shorter setae between the rows; facial setae, other than mystax, pale-yellow; frons coppery-pollinose; orbital setae dark-brown; vertex coppery-pollinose; ocellar tubercle coppery-pollinose, as high as vertex, 0.39 × as wide as frons, anterior ocellus 0.14 × as wide as frons by the ocellus position.

Thorax. Postpronotal lobe black with yellow spot dorsal to mesothoracic spiracle; scutum shiny black, not punctate, vestiture dark-brown, unequal-sized, reclinate anteriorly and proclinate posteriorly; one; scutellum black, scutellar margin strongly impressed, longest ones slightly longer than scutellum; postalar callosity dark-brown, partly with bright-blue reflections; pleuron shiny dark-brown, with silvery-white pollinosity; setulae on proepisternum, katepisternum, and anepisternum; two anepisternal macrosetae, light-brown; tuft of katatergal macrosetae light-brown; anatergite with golden, hair-like setae.

Legs. Coxae orange-yellow; trochanter yellow, with fine yellow setulae; femora yellow, slightly darkened dorsally, covered with short stout yellow setulae dorsally, with dark setae on apical 1/3 dorsally, ventrally with weak yellow setae in two rows, hind femur with 3 long dark-brown ventral macrosetae; anterior four tibiae yellow dorsally and brown ventrally, with white setulae, long yellow macrosetae and long dark-brown macrosetae; hind tibiae yellow, entirely covered by golden setulae, and medium-sized fine dark-brown setae ventrally; modified tibial setae attached to hind tibia at basal 1/3, dark-brown, as long as femur, golf-club-shaped with apical 1/4 as a large white lamella with black spot at apex; tarsi yellow, with stout yellow setae dorsally and densely covered with thick yellow setae, 5th tarsomere with 3 setae apically, opposite the claws and subequal to them; claws yellow on base and black apically; pulvilli yellow and fringed; empodium shorter than claws.

Wing. Brownish, darker along upper margin; cell r1 with long slightly-concave stalk (2.5 × the length of r-m); crossvein r-m medially in cell d, distal to the end of Sc; cell m3 narrowing distally (M2 and M3 converging by the end of cell m3), with stalk slightly longer than r-m, apex of m3 and apex of cell d parallel and aligned; crossvein bm-cu short, base of M3 and CuA1 arranged almost as an “X”; cell cup with stalk shorter than r-m; posterior margin of wing slightly concave at distal half; calypters white, with light-brown margin and fringe of short yellow setae; halter with yellow stem, brown knob.

Abdomen. Black, not punctate, with sides diverging posteriorly, T2 1.6 × wider than long; vestiture longer and lighter laterally and ventrally, several light-yellow macrosetae present on lateral margin of T1 and T2. Male terminalia. Hypopygium very conspicuous; hypandrium regular-sized (2/3 the width of hypopygium or more), much wider than long, anterior margin straight to slightly convex, posterior margin smoothly convex; gonocoxites partially fused to hypandrium, gonocoxal prolongation thin, smoothly curved inwards, with 2 spines at apex; gonostylus reduced, round, laterally flattened, free, attached to the base of gonocoxite; apex of phallus with three unequal-sized prongs, mid prong much longer than the others; epandrium straight in lateral view; lobes of hypoproct protruding.

Female. Total length, excluding antennae, 5.7-7.2 mm, (n=3); length of thorax, 1.5-1.7 mm, (n=3); length of wing, 5.2-6.2 mm, (n=3); greatest width of abdomen, 1.3-1.6 mm, (n=3). Differs from male as follows: gibbosity that equals ventral 0.28-0.3 of face height; proboscis 0.39-0.56 × the height of head; antenna 0.78-0.95 × as long as the height of eye; antennal insertion at dorsal 0.19-0.2 of head height; postpedicel 1.8-2 × length of basal two segments; head 1.4-1.5 × as wide as high; face 0.16 × as wide as head; mystax long (extending beyond the apex of proboscis); ocellar tubercle 0.33 × as wide as frons; anterior ocellus 0.11-0.17 × as wide as frons by the ocellus position; postpronotal lobe dark-brown; proepisternum, anepisternum and katepisternum with golden setulae; trochanter orange-yellow; femora yellow and dark-brown dorsally; femora covered with short, stout brown setulae dorsally; hind femur with 3 long yellow ventral macrosetae; tibiae yellow dorsally and brown ventrally, hind tibia reddish-brown, yellow dorsally on basal 1/3; tibiae with white setulae, long yellow macrosetae, long dark-brown macrosetae, and thick spines; hind tibiae entirely covered by dark-brown setulae; hind tibia with light-brown setulae ventrally, yellow macroseta inserted ventrally on the middle, fine, medium-sized dark-brown setae dorsally, and long, dark-brown macrosetae anterodorsally; modified tibial setae absent; tarsi dark-brown, with claw-like dark-brown setae ventrally, stout dark-brown setae dorsally, and densely covered with thick spine-like dark-brown setae; claws reddish on base and black apically, mid tarsi with yellow-and-black claws; apex of cell m3 and apex of cell d angled and unaligned, apex of m3 beyond apex of d; posterior margin of wing slightly convex at distal half; halter with orange stem; T2 1.47-1.84 × wider than long; white macrosetae on T1-2; one lateral marginal macrosetae present on T4, T5, T6, and T7. Female genitalia. Three spermathecae; reservoirs cylindrical, coiled; spermathecal ducts opening independently at the bursa; genital fork rectangular, U-shaped, arms anteriorly thick, posteriorly slender, divergent; accessory glands oval.

Morphological variation. Total length, excluding antennae, 6.0-6.6 mm, (n=4); length of thorax, 1.4-1.5 mm, (n=4); length of wing, 4.9-5.4 mm, (n=4); greatest width of abdomen, 1.0-1.1 mm, (n=4). Some specimens differed from the holotype, as follows: gibbosity that equals ventral 0.23-0.26 of face height; proboscis 0.4-0.57 × the height of head; antenna 0.82-0.86 × as long as the height of eye; antennal insertion at dorsal 0.18-0.24 of head height; postpedicel 1.8-1.9 × length of basal two segments; head 1.37-1.4 × as wide as high; face 0.15-0.17 × as wide as head; mystax comprised of 8-10 macrosetae; ocellar tubercle 0.34-0.37 × as wide as frons; anterior ocellus 0.13-0.16 × as wide as frons by the ocellus position; T2 1.42-1.56 × wider than long.

Distribution.

Brazil ( Goiás, São Paulo and Paraná).

Remarks.

There is a group of females from Fênix (PR) that differs from the paratypes assigned by presenting an oblong postpedicel, dark-brown coxae and homogeneously directed vestiture on the scutum. Therefore, these specimens are not included as paratypes for the species, since they vary in such consistent characters; instead, these specimens are listed under "additional material examined".

Oidardis maculiseta occur mainly in Atlantic Semi-deciduous Forest. As noted above for Oidardis falcimystax , they were also found in the Cerrado area, at Corumbá de Goiás, a locality which has a Lower Diptera fauna similar to the Semi-deciduous Forest ecorregion (D. S. Amorim, unpublished data).

Etymology.

from the Latin, macula = spot, and seta = bristle. Refers to the singular morphology of the modified tibial seta.

Type-material examined.

Holotype: Brazil: Paraná, Fênix, Reserva Estadual ITCF, (23°55'0.05"S, 51°57'38.26"W), 3.xi.1986, coll. Lev. Ent. PROFAUPAR - male (DZUP). Paratypes: Brazil: Goiás, Corumbá [de Goiás], Fazenda Monjolinho, (15°55'0.12"S, 48°46'0.12"W), xi.1945, coll. Barretto - 1 male (MZUSP); Paraná, Fênix, Reserva Estadual ITCF, (23°55'0.05"S, 51°57'38.26"W), 6.x.1986, coll. Lev. Ent. PROFAUPAR - 1 male (DZUP); same locality, 20.x.1986, coll. Lev. Ent. PROFAUPAR - 1 male (DZUP); same locality, 3.xi.1986, coll. Lev. Ent. PROFAUPAR - 2 males (DZUP, MZUSP); same locality, 10.xi.1986, coll. Lev. Ent. PROFAUPAR - 3 males (DZUP); same locality, 17.xi.1986, coll. Lev. Ent. PROFAUPAR - 2 males (DZUP, MZUSP); same locality, 24.xi.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP, MZUSP); same locality, 8.xii.1986, coll. Lev. Ent. PROFAUPAR - 2 males (DZUP); same locality, 22.xii.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); same locality, 29.xii.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); São Paulo, Barão de Antonina, (23°37'38.07"S, 49°33'40.68"W), i.1946, coll. Barretto - 2 females, 1 male (MZUSP); São Paulo, (23°32'56.19"S, 46°38'19.74"W), xii.1940, coll. M. Carrera (Horto Florestal) - 1 male (MZUSP). Additional material examined. Brazil: Paraná, Fênix, Reserva Estadual ITCF, (23°55'0.05"S, 51°57'38.26"W), 20.x.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); same locality, 27.x.1986, coll. Lev. Ent. PROFAUPAR - 1 females (MZUSP); same locality, 10.xi.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); same locality, 24.xi.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); same locality, 8.xii.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); same locality, 15.xii.1986, coll. Lev. Ent. PROFAUPAR - 1 female (DZUP); Foz do Iguaçu, (25°32'48.83"S, 54°35'17.42"W), 7.xii.1966, coll. Exc. Dep. ZOO - 1 female (DZUP).