Lamproclasiopa triangularis, Costa, Daniel N. R., Mathis, Wayne N. & Marinoni, Luciane, 2016

Costa, Daniel N. R., Mathis, Wayne N. & Marinoni, Luciane, 2016, A revision of the shore-fly genus Lamproclasiopa Hendel (Diptera, Ephydridae), ZooKeys 631, pp. 1-99 : 22-26

Taxon classification Animalia Diptera Ephydridae

Lamproclasiopa triangularis sp. n. Figs 18-19, 20-23, 81

Diagnosis.

This species is distinguished from other congeners by the following combination of characters: Small to moderately small shore-fly species, body length 1.65-2.10 mm; generally black, subshiny to shiny. Head: Frons generally mostly brownish black to black, moderately microtomentose, subshiny; mesofrons more microtomentose, tan to brown; some specimens with 2 gray spots along ventral margin just dorsad of antennal bases. Antenna mostly black, especially scape and pedicel, only basal flagellomere with ventrobasal area with some yellow to yellowish orange coloration. Ventral half of face with a microtomentose triangle (Fig. 18), sometimes dorsal angle of triangle extended dorsally to level of base of antennae, base of triangle sometimes partially bare, otherwise face largely bare, black except for yellow to yellowish orange lateral margins adjacent to parafacial and antennal grooves; bearing 2 larger facial setae, dorsal seta at about midfacial height, dorsomesoclinate; ventral seta just dorsad of epistomal margin, slightly dorsoclinate; parafacial silvery white. Gena relatively short, gena-to-eye ratio 0.06-0.10. Thorax: Mesonotum uniformly whitish gray microtomentose; pleural area very sparsely microtomentose, mostly dark brown, partially subshiny; presutural supra-alar seta lacking or indistinguishable from surrounding setae. Wing hyaline, lacking any pattern or markings; costal vein ratio 0.74-0.79; M vein ratio 0.55-0.59. Legs, except tarsi, black; forefemur with posteroventral setae slender, not stout and peg-like; tarsi yellow; apical tarsomere slightly darker than other tarsomeres. Abdomen: Generally black, subshiny to mostly shiny, dorsum of tergites very sparsely and finely microtomentose, faintly whitish gray; sternite 3 of male rectangular, parallel sided, length twice width; sternite 4 of male rectangular, length almost twice width; sternite 5 of male a single, deeply U-shaped plate, length about twice width, opening of U posterior. Male terminalia (Figs 20-23): Epandrium in posterior view (Fig. 20) almost as wide as high, as an inverted U, dorsal arch very thin, verticolateral arms gradually becoming wider, width wider than width of cercus, in lateral view (Fig. 21) narrow, elongate, overall as a robust, irregular tear drop with an anteroventral, short, shallowly pointed projection; cercus in posterior view (Fig. 20) bar-like, elongate, narrow, with dorsal half wider than ventral half, slightly tapered from dorsum to ventral margin, not fused with ventral margin of cercal cavity, in lateral view (Fig. 21) elongate, dorsal half slightly wider than ventral half; gonite in ventral view (Fig. 22) as an inverted, robust comma, in lateral view (Fig. 23) bar-like, shallowly arched; aedeagus in lateral view (Fig. 23) robust, narrowly and irregularly rectangular, widest basally, thereafter slightly tapered to truncate apex, in ventral view (Fig. 22) elongate, narrow, narrowly ovate, acutely pointed apically; phallapodeme in lateral view (Fig. 23) as a deeply dissected triangle, extended keel rounded apically, each extended arm narrow, in ventral view (Fig. 22) narrow spindle shaped with a medial bulge, basal and apical widths subequal; hypandrium in ventral view (Fig. 22) as a robust V-shaped structure, vertex especially robust, in lateral view (Fig. 23) narrow, elongate, shallowly arched.

Type material.

The holotype male of Lamproclasiopa triangularis is labeled "PERU. Madre de Dios: Manu, Rio Manu, 250 m[,] Pakitza, 12°7'S, 70°58'W [11°56.6'S, 71°16.9'W], 9-23 Sep 1988[,] Amnon Freidberg/ USNM ENT 00118309 [plastic bar code label]/HOLOTYPE ♂ Lamproclasiopa triangularis Costa, Mathis & Marinoni, USNM [red]." The holotype is double mounted (minuten pin in a block of plastic), is in excellent condition, and is deposited in the USNM. Forty three paratypes (21♂, 22♀; DZUP, INPA, USNM) bear the same label data as the holotype but with W. N. Mathis as the collector.

Type locality.

Peru. Madre de Dios: Río Manu, Pakitza (11°56.6'S, 71°16.9'W; 250 m).

Other specimens examined.

BRAZIL. Amazonas: Manaus, Universidade Federal do Amazonas (03°05.9'S, 59°58.2'W; 50 m), 7 May 2010, D. and W. N. Mathis (3♂, 6♀; INPA, USNM). Paraná: Antonina, Reserva Natural Rio Cachoeira (25°19'S, 48°41,6'W), 8 Feb 2010, D. Negoseki (1♂; DZUP). São Paulo: Ubatuba, Cachoeira da Lage (23°17.6'S, 44°52.1'W; 100 m), 30 Mar 2010, D. and W. N. Mathis (1♂, 3♀; DZUP, USNM).

ECUADOR. Orellana: Rio Tiputini (0°38.2'S, 76°8.9'W), 12-26 Aug 1999, W. N. Mathis, A. Batista, M. Kotrba (7♂, 2♀; USNM).

GUYANA. Kaieteur Falls (5°10.7'N, 59°29.2'W; 570 m), 7 Apr 1994, W. N. Mathis (1♂, 2♀; USNM). Kanuku Mountains, Kumu River and Falls (3°15.9'N, 59°43.5'W), 28-30 Apr 1995, W. N. Mathis (1♂; USNM). Kanuku Mountains, Moco Moco River (3°18.2'N, 59°38.9'W), 29 Apr 1995, W. N. Mathis (2♂, 1♀; USNM). Lethem (25 km SE; 3°18.2'N, 59°38.9'W), 4-5 Apr 1994, W. N. Mathis (2♂; USNM).

PERU. Madre de Dios: Río Manu, Pakitza (11°56.6'S, 71°16.9'W; 250 m), 9-23 Sep 1988, A. Freidberg, W. N. Mathis (21♂, 23♀; USNM).

Distribution

(Fig. 81). Neotropical: Brazil (Amazonas, Paraná, São Paulo), Ecuador (Orellana), Guyana, Peru (Madre de Dios).

Etymology.

The species epithet, triangularis , is of Latin derivation, meaning triangular, and refers to the small triangular microtomentose area on the face of this species.

Remarks.

This species is distinguished from congeners by the triangle-shaped facial spot that is sparsely microtomentose. The triangle is situated medially on the ventral half of the face and is sometimes slightly elongated. Also distinguishing this species are the robust (thick) aedeagus in lateral view with its truncate apex and the narrow and elongated keel of the phallapodeme.