Argentinomyia puntarena Montoya, 2020

Montoya, Augusto L. & Wolff, Marta, 2020, Description of six new large species of Argentinomyia Lynch-Arribalzaga, 1891 and redescription of Talahua fervida (Fluke, 1945) (Diptera, Syrphidae, Syrphinae), ZooKeys 929, pp. 19-51 : 19

Argentinomyia puntarena Montoya sp. nov. Figures 6 , 7 , 16

Differential diagnosis.

Antenna orange ventrally, oval, longer than wide. Costal cell hyaline, bare basally. Alula bare medially. Pro- and mesofemur yellow. Metafemur orange on basal 1/5 and apical 3/5. Probasitarsomere, meso- and metabasitarsomere I-II yellow. Second tergum with a broad macula reaching apical 1/3. Third tergum with a broad macula, short in fourth. Sternite fourth to fifth black pilose. Argentinomyia puntarena sp. nov. is similar in appearance to Argentinomyia talamanca sp. nov., but in A. talamanca sp. nov. the antenna is brown; alula and costal cell are extensively microtrichose; femur is extensively brown; the second tergum has a pair of small maculae on basal 1/5 (see 'diagnostic features’ under each species or key).

Type locality.

Costa Rica, department of Puntarenas, Coto Brus municipality, Sendero entre Estación Tres Colinas y Laguna Seca, 9°1.279'N, 82°, 50.337'E, 2100-2550 m a.s.l.

Description.

Male. Head (Fig. 6A, C ). Black, covered with white pollinosity, ocellar triangle, and a large triangular macula on the front, brown pilose, pile on front black, on gena and face white pilose, on ocellar triangle black pilose, on the occiput white except for the dorsal pile, which are black, frontal triangle golden metallic. Antennae brown, orange-red ventrally, oval, longer than wide pedicel and the lower basal corner of basoflagellomere, ratio 1.0:1.1:2.9, arista orange, dark brown toward the tip. Thorax (Fig. 6C ). Black, scutum shining, with iridescent to opaque reflections, with two median brownish pollinose vittae on anterior half. Wing (Fig. 6C ). Slightly smoky, the stigma brownish, membrane microtrichose, except for extensive bare areas on basal half (cells, sc, r1, dm and bm); costal cell hyaline, bare on basal 1/2; marginal maculae restricted to surrounding areas of veins R1, R4+5 and M1 apically; tegula black pilose, basicosta yellow pilose, alula bare medially, calypter whitish, border whitish, fringe yellow, plumula yellow, halter yellow, knob white. Legs (Fig. 6C ). Yellow, pro- and mesofemur yellow; metafemur brown, except orange on basal 1/5 and apical 1/5; pro and mesotibia orange, metatibia extensively brown, only orange brownish on basal 2/3; probasitarsomere, meso- and metabasitarsomere I-II yellow, the pile yellow, black on the metatibia and above on the tarsi. Abdomen (Fig. 6B ). Elongate, black, the first tergum shining black, orange laterally, the second tergum with a broad macula reaching apical 1/3 laterally; third tergum with a broad triangular macula, which is short in the fourth tergum; fourth and fifth sterna black pilose. Pile orange on the sides basally, as well as in the maculae, black down the middle and on the terga apex. Male genitalia as Fig. 7 .

Female. (Fig. 6D-F ). Similar to male except for normal sexual dimorphism. Frons with pollinose transversal maculae below. Abdominal maculae are comparatively shorter than in the male and indistinguishable in the fourth tergum.

Length (N = 4). Body 12.4-12.6 mm; wing 11.3-11.5 mm.

Etymology.

The specific epithet puntarena is a noun in apposition and refers to the province where the type series was collected.

Distribution.

Argentinomyia puntarena sp. nov. (N = 5) is distributed through the west slope of the Talamanca Cordillera in Costa Rica (Puntarenas, San José) at an elevation between 1000 to 2550 m. a.s.l., in the province of Puntarena-Chiriquí (Fig. 16 ). Argentinomyia puntarena sp. nov. occurs in sympatry with A. talamanca sp. nov. in the Puntarena-Chiriquí province.

Type material.

Holotype. COSTA RICA ♂, Puntarenas, Coto Brus , Sendero entre Estacion Tres Colinas y Laguna Seca . "Original label: "Costa Rica: Puntarenas, Coto Brus, Sendero entre / Estación Tres Colinas y Laguna Seca / 9°1.279'N, 82°50.337'E (L.S. 344300_565800), 2100-2550 m a.s.l. / 24.vii.2000, Manual, A. Picado Leg., #59166 ( INBio 000311623 )". "HOLOTYPE / Argentinomyia huitepecensis / Montoya 2020" [red, handwritten except the first line]". The holotype is in good condition and deposited at the INBio museum, in Costa Rica. "identified as Argentinomyia sp. 16 by Thompson". Paratypes. COSTA RICA • 1 ♂, Puntarenas, Monteverde, San Luis, 10°16.644'N, 84°47.271'E (L.S. 250850_449250), 1000-1350 m a.s.l., 7.iv.1995, Fuentes #4801 (INBio CRI002202643); 1♀, San José, San Gerardo de Dota, Sevegre Lodge near Rio Sevegre, 9°33.000'N, 83°48.000'E (L.S. 387400_482700), 2200 m a.s.l., 18-21.viii.1995, A.L. Norrbom (USNM ENT 00036925); 1♀, same data as for preceding, 2000-2500 m a.s.l., 22.ii.1992, Tachinidae and Syrphidae course (INBio CRI000406820); 1♀, Farm Zacatales, 2100 m a.s.l., 8-10.viii.1995, M.A. Zumbado, #6280 (INBio CRI002427774).

Comments.

Argentinomyia puntarena sp. nov. and Argentinomyia talamanca sp. nov. can be confused or mistakenly identified as Xanthandrus mexicanus Curran, 1930 due to the superficial similarity of these species. However, X. mexicanus can be distinguished by the presence of the antennal cavity broadly confluent (synapomorphy for Xanthandrus ); the central portion of epistoma moderately prominent; the face entirely white pollinose and pilose; the pleura black with white pollinosity; metaepisternum with some fine subappressed long pile (distinctive of Xanthandrus ); the abdomen oval, wide and flat, opaque, with yellow-orange triangular maculae on second to the fourth tergum, and the male genitalia with surstylus elongated, apically widened ( Borges and Pamplona 2003:162, figs 33-37).

Figures

Figure 6. Argentinomyia puntarena sp. nov., male (InBio CRI 000311623): A head, frontal, male B dorsal view C lateral view. Female (InBio CRI 002427774): D head, frontal view E dorsal view F lateral view. Scale bars: 5 mm.

Figure 7. Argentinomyia puntarena sp. nov., male genitalia: A whole genitalia including epandrium, cercus, and surstylus, lateral view B epandrium, dorsal view C hypandrium, ventral view. Scale bar: 0.05 mm.

Figure 16. Biogeographical distribution of Argentinomyia huitepecensis sp. nov. (green), A. talamanca sp. nov. (red) and A. puntarenas sp. nov. (blue).