Hydrochasma andeum, Mathis, Wayne N. & Zatwarnicki, Tadeusz, 2013

Mathis, Wayne N. & Zatwarnicki, Tadeusz, 2013, A revision of the shore-fly genus Hydrochasma Hendel (Diptera, Ephydridae), ZooKeys 363, pp. 1-161 : 71-73

24. Hydrochasma andeum sp. n. Figs 132-136

Diagnosis.

This species is distinguished from congeners by the following combination of characters: Small shore flies, body length 1.55-1.90 mm. Head: Subglobose, very broad ventrally, oral opening comparatively large; at least pedicel black, otherwise antennal coloration variable; parafacial silvery white, concolorous with facial coloration; parafacial silvery white, concolorous with face; gena-to-eye ratio 0.13-0.16. Thorax: Mesonotum tan to golden brown; pleural area gray. Wing with costal vein ratio 0.72-0.75; M vein ratio 0.48-0.49. Forecoxa mostly yellowish, with some silvery gray areas basally and laterally; forefemur lacking a distinctive, comb-like row of stout setulae along anteroventral surface; tibiae mostly gray; hindtibia lacking a long, spur-like seta ventroapically. Abdomen: Tergites 2-4 with lateral margin of distinctly darkened area essentially straight, sharply contrasted with gray lateral and ventral surfaces. Male terminalia (Figs 132-135): Epandrium generally elongate, length nearly 3 × width, elongate, in posterior view (Fig. 132) elongate diamond shaped, ventral portion double length of dorsal portion, both tapered; cerci fused ventrally with epandrium, height about twice width in lateral view, in lateral view (Fig. 133), elongate, narrow, anterior margin sinuous, posterior very shallowly sinuous; aedeagus in lateral view (Fig. 135) elongate, narrow, tubular, almost parallel sided, in ventral view (Fig. 134) also tubular, elongate narrow; phallapodeme in lateral view (Fig. 135) elongate, narrow, curved, slightly wider medially, epandrial end shallow bifurcate, in ventral view (Fig. 134) elongate, T-shaped with double crossbars, these pointed; gonite in lateral view (Fig. 135) elongate, narrow, curved toward hypandrial end, in ventral view (Fig. 134) elongate, narrow, bar-like; hypandrium in lateral view (Fig. 135) elongate, narrow, tapered at both ends, in ventral view (Fig. 134) robustly U-shaped with greatly enlarged, thick, anterior portion of U, anterior margin truncate, posterior margin deeply emarginate, emargination U-shaped.

Type material.

The holotype male of Hydrochasma andeum is labeled "ECUADOR: Guayas Pr. Boliche (14.5 km S.)[,] 14 Jan 1978[,] Wayne N. Mathis/USNM ENT 00117965 [plastic bar code label]/HOLOTYPE ♂ Hydrochasma andeum Mathis & Zatwarnicki, USNM [red]." The holotype is double mounted (minuten in a block of plastic), is in excellent condition, and is deposited in the USNM. Seven paratypes (1♂, 6♀; USNM) bear the same label data as the holotype. Other paratypes are as follows: ECUADOR. Guayas: Pedro Carbo (01°48.7'S, 80°13.9'W), 11 Jan 1978, W. N. Mathis (5♂ in glycerin; 1♂, 3♀; USNM). Manabí: Bahia de Caraquez (0°36.5'S, 80°25.8'W), 10 Jan 1978, W. N. Mathis (3♂, 2♀; USNM).

Type locality.

Ecuador. Guayas: Boliche (02°07.7'S, 79°35.5'W).

Other specimens examined.

Neotropical. ECUADOR. Azuay: Río Rircay (03°20'S, 79°19'W), 31 Oct 1954, R. Levi-Castillo (1♂, 1♀; USNM). El Oro: El Guabo (03°13'S, 79°47.7'W), Dec 1955, R. Levi-Castillo (1♀; USNM); El Pasaje (03°19.6'S, 79°48.3'W), 1 Nov 1954, R. Levi-Castillo (1♂; USNM); Machala (03°15.6'S, 79°57.8'W), Dec 1955, R. Levi-Castillo (2♂, 3♀; USNM), Puerto Bolivar (03°16'S, 80°W), Dec 1955, R. Levi-Castillo (2♂, 3♀; USNM). Guayas: Balao (02°55'S, 79°49'W), Dec 1955, R. Levi-Castillo (1♂, 2♀; USNM); Barranco Chico (02°03.5'S, 79°48.2'W), 28 Aug 1955, R. Levi-Castillo (2♂, 3♀; USNM); Chobo (02°09'S, 79°38'W), Jun 1955, R. Levi-Castillo (8♂, 4♀; USNM); Cone (02°10.1'S, 79°38'W), Jun 1955, R. Levi-Castillo (3♂, 3♀; USNM); Gala (03°0.7'S, 79°44.3'W), Dec 1955, R. Levi-Castillo (1♂, 1♀; USNM); Naranjal (02°40'S, 79°37'W), Dec 1955, R. Levi-Castillo (2♂, 3♀; USNM); Quatro Hermanitos Experimental Farm (4 km WNW Guayaquil; 02°10.4'S, 79°56.2'W), R. Levi-Castillo (1♀; USNM); Taura (02°18.6'S, 79°43.9'W), Dec 1955, R. Levi-Castillo (1♂; USNM); Tenguel (02°59.9'S, 79°47.3'W), Dec 1955, R. Levi-Castillo (15♂, 8♀; USNM). Loja: Catamayo (03°59'S, 79°21'W), Dec 1955, R. Levi-Castillo (21♂, 12♀; USNM); Vilcabamba (04°15.7'S, 79°13.3'W), Dec 1955, R. Levi-Castillo (1♂; USNM). Manabí: Bandurria (0°45.7'S, 80°30.7'W), Aug 1955, R. Levi-Castillo (1♂, 2♀; USNM); Estero Balsa (02°02'S, 80°43'W), 9 Sep 1955, R. Levi-Castillo (2♂; USNM); Guale (01°37.9'S, 80°14.3'W), 23 Apr 1955, R. Levi-Castillo (3♂, 2♀; USNM); La Palma (0°45.7'S, 80°30.7'W), Aug 1955, R. Levi-Castillo (2♂, 1♀; USNM). Pichicha: Guare, Los Ríos (01°41'S, 79°42'W), Aug 1955, R. Levi-Castillo (5♂, 4♀; USNM).

Distribution

(Fig. 136). Neotropical: Ecuador (Azuay, El Oro, Guayas, Loja, Manabí, Pichicha).

Etymology.

The species epithet, andeum, is a Latinized word that refers to the general area in South America where this species was collected. The word is treated as a noun in apposition.

Remarks.

This species is similar and evidently closely related to Hydrochasma annae , especially the similar shapes of their respective epandriums. It is distinguished from Hydrochasma annae by having more sinuous margins of the epandrium in posterior and lateral views (Figs 132-133) and in the more robustly developed hypandrium that is thickly developed on the anterior two-thirds. This species is known thus far only from Ecuador, and Hydrochasma annae is from western United States.