Lamproclasiopa bisetulosa (Cresson)

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 : 76-80

Taxon classification Animalia Diptera Ephydridae

Lamproclasiopa bisetulosa (Cresson) Figs 118-119, 120-123, 139

Ditrichophora bisetulosa Cresson 1939: 7.

Discocerina (Basila) bisetulosa . Cresson 1946: 148 [generic combination]. Wirth 1968: 7 [Neotropical catalog]. Lizarralde de Grosso 1989: 24 [list, Argentina]. - Lizarralde de Grosso et al. 2011: 13 [Argentina catalog]. Mathis and Zatwarnicki 1995: 165 [world catalog].

Lamproclasiopa bisetulosa . Zatwarnicki and Mathis 2001: 39 [generic combination].

Diagnosis.

This species can be distinguished from congeners by the following combination of characters: Small to moderately small shore flies, body length 1.45-2.10 mm. Head: Frons with golden tan to slightly darker microtomentum, parafrons with slightly thinner investment of microtomentum; mesofrons evident by slight lateral lines. An tenna yellow; basal flagellomere with darker dorsal margin. Face completely and more or less uniformly silvery white microtomentose, more thinly microtomentose ventrally except for extreme ventral margin, vertical lacking stripes; 2 prominent facial setae, dorsal seta at midheight, other seta near epistomal margin; parafacial thin, more densely silvery white microtomentose than face. Gena moderately high, gena-to-eye ratio 0.12. Thorax: Mesonotum with golden brown microtomentum, subshiny, although less dense than microtomentum of frons; presutural supra-alar seta well developed; pleural areas more sparsely microtomentose than mesonotum, blackish brown to black, becoming less microtomentose ventrally and posteriorly, subshiny to shiny. Wing completely hyaline, lacking darkened areas; costal vein ratio 0.47-0.60; M vein ratio 0.55-0.75. Forefemur with posteroventral setae slender, not stout and peg-like; femora and tibiae grayish black to black, apical 1/4 of tibiae yellowish; tarsi yellowish, apical 1-2 tarsomeres darkened. Abdomen: Tergites more sparsely microtomentose than mesonotum, shinier black, especially laterally and mostly of tergites 4 and 5. Male terminalia (Figs 120-123): Epandrium in posterior view (Fig. 120) roundly U-shaped, except for ventral gap, oval, widest a midheight, dorsal arch very narrow, gap at ventral margin widely and shallowly U-shaped with lateral margins becoming wider ventrally, each lateral arm widest ventrally with short, medial extension, almost touching opposite medial extension, ventral extension bearing numerous setulae loosely organized as a group; cercus hemispherical, tapered ventrally to narrowly rounded apex, more setulose dorsally; gonite in lateral view (Fig. 123) robustly rod-like, almost straight, wider toward hypandrium, in ventral view (Fig. 122) shallowly curved with extension toward aedeagal base tapered to a narrow apex, apex toward hypandrium widest, with a medial, blunt, short extension; aedeagus in lateral view (Fig. 123) elongate, narrowly triangular, tapered evenly to narrowly rounded apex, in ventral view (Fig. 122) as an elongate, very narrow, rod-like structure, widest sub-basally, thereafter tapered to apex, apex with a short nipple; phallapodeme in lateral view (Fig. 123) as an inverted Y, each arm digitiform, process toward aedeagal base longer than other 2, in ventral view (Fig. 122) narrowly rectangular, robustly rod-like with shallow indentations toward hypandrium, keel digitiform; hypandrium in lateral view (Fig. 123) generally narrow, rod-like, essentially straight, basal third more thinly developed than anterior half, not obtusely angulate, in ventral view (Fig. 122) as a very broad, robust H with long posterior arms, lateral margins conspicuously sinuous, anterior emargination V-shaped, posterior emargination deep, broadly U-shaped.

Type material.

The holotype male of Ditrichophora bisetulosa Cresson is labeled "Paraguay Friebrig/S[an].Bernardino 1907. XI-/TYPE Ditrichophora BISETULOSA E. T. Cresson, Jr. [red; " Ditrichophora BISETULOSA" handwritten]." The holotype is double mounted (minuten pin in a thin rectangular piece of fine foam), is in good condition (some setulae missing or displaced), and is deposited in the ANSP (6574)].

Type locality.

Paraguay. Cordillera: San Bernardino (25°18.8'S, 57°18'W).

Other specimens examined.

ARGENTINA. Buenos Aires: Buenos Aires (34°36'S, 58°22.9'W), 21 Oct 1926, F. & M. Edwards (1♂; USNM); San Isidro (34°29.6'S, 58°32.6'W), 2 Sep 1927, R. C. Shannon (1♀; ANSP. 1♂, 1♀; USNM); José C. Paz (34°31'N, 58° 46'W), 24 Aug 1939, A. Ogloblin (2♂; USNM). Misiones: Santa Ana (27°22.1'S, 55°34.9'W), 9 Dec 1949, H. Aesel (1♂; USNM).

URUGUAY. Montevideo: Montevideo (34°53.3'S, 56°11'W), 15 Jan 1965, E. F. Legnef (2♂; USNM).

Distribution

(Fig. 139). Neotropical: Argentina (Buenos Aires, Misiones), Paraguay (Cordillera), Uruguay (Montevideo).

Remarks.

This species is very similar to Lamproclasiopa aracataca externally and in the shape of structures of the male terminalia. These similarities indicate that these two species are closely related. The differences, although seemingly slight, are consistent, and are the basis for our continued recognition of this species. This species is distinguished from Lamproclasiopa aracataca by being slightly shinier externally and by the shape of structures of the male terminalia: the hypandrium has a less well-developed base, and the phallapodeme has a narrow keel.