Hydrochasma miguelito, 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 : 59-60

18. Hydrochasma miguelito sp. n. Figs 101-105

Diagnosis.

This species is distinguished from congeners by the following combination of characters: Small to moderately small shore flies, body length 1.60-2.05 mm. Head: Not subglobose or broad, oral opening small. At least pedicel black, otherwise antennal coloration variable; parafacial silvery white, concolorous with facial coloration; gena-to-eye ratio 017-0.18. Thorax: Mesonotum grayish tan to golden brown. Wing with costal vein ratio 0.66-0.68; M vein ratio 0.51-0.54. Forecoxa mostly silvery gray to gray with some yellowish coloration at ventral apex; 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 3-4 with deep, gray to silvery gray wedges at lateral margins; tergite 5 of male mostly to entirely gray, sometimes with posterior margin darkened. Male terminalia (Figs 101-104): Combined structures generally moderately elongate, in posterior view height about twice width; epandrium with dorsal arch narrowly connected above cerci; dorsal half more or less generally sparsely setulose, ventral half with sparse, very short setulae; in posterior view (Fig. 101) as an inverted, angulate, moderately narrow U, ventral epandrial extension narrowed to just before greatly expanded, apical third, apical portion broad as an arrow point with broad, medial incision apically, in lateral view (Fig. 102) narrowly elongate, parallel-sided except for extended base of arrow point; aedeagus in lateral view (Fig. 104) elongate, about 5 × longer than greatest width, tubular, becoming wider and more membranous apically, in ventral view (Fig. 103) with basal 2/3 narrow, parallel sided, apical third abruptly enlarged, bulbous, slightly tapered apically; phallapodeme in lateral view (Fig. 104) narrowly elongate, almost parallel sided, hypandrial end slightly expanded, in ventral view (Fig. 103) narrowly I-shaped with expanded end toward aedeagus and with subapical, short crossbar at hypandrial end; gonite in lateral view (Fig. 104) narrowly elongate, very shallowly sinuous, bar-like, in ventral view (Fig. 103) more conspicuously sinuous; hypandrium in lateral view (Fig. 104) narrowly elongate, shallowly curved, in ventral view (Fig. 103) with anterior 2/3 somewhat quadrate, anterior margin broadly truncate, posterior margin deeply, widely emarginate with short, lateral apices.

Type material.

The holotype male of Hydrochasma miguelito is labeled "HONDURAS. Cortés: San Pedro Sula (8 km S)[,] 15°25.7'N, 88°01.4'W [,] 25-26 September1995[,] Dianne & W.N.Mathis/USNM ENT 00138962 [plastic bar code label]/HOLOTYPE ♂ Hydrochasma miguelito 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 (3♂, 4♀; USNM) bear the same label data as the holotype.

Type locality.

Honduras. Cortés: San Pedro Sula (8 km S; 15°25.7'N, 88°01.4'W).

Other specimens examined.

Neotropical. COSTA RICA. Guanacaste: Nandayure, Río Morote, Finca Palmichal (10°03'N, 85°12'W; 0-50 m), 26 Mar 2006, W. Porras (1♂; INBio). Puntarenas: Bosque Esquinas (08°44'N, 83°17'W; 200 m), May 1994, M. Segura (1♂; INBio); Jacó (5 km E; 9°34.7'N, 84°35.6'W), 10 Jun 2003, D. and W. N. Mathis (4♂; USNM).

Distribution

(Fig. 105). Neotropical: Costa Rica (Guanacaste, Puntarenas), Honduras ( Cortés).

Etymology.

The species epithet, miguelito, is to recognize Michael W. Mathis who is also known as "Don Miguel" or “Miguelito.” Michael guided us while conducting field work in Honduras where this species was collected. We are treating miguelito as a noun in apposition.

Remarks.

Structures of the male terminalia readily distinguish this species from congeners, especially those of the incisum group. Certainly unique to this species is the greatly expanded apical portion of the ventral, epandrial process, which is like a broad arrowhead. The expanded, ventral, epandrial process can be seen in ventral and somewhat in lateral views. The rectangular hypandrium that has a moderately deep and wide posterior emargination is also characteristic.