Cyamops alessandrae Mathis and Sueyoshi

Mathis, Wayne N. & Sueyoshi, Masahiro, 2011, New species of the genus Cyamops Melander from New Zealand (Diptera, Periscelididae, Stenomicrinae), ZooKeys 114, pp. 29-40 : 33-36

Cyamops alessandrae Mathis and Sueyoshi sp. n. Figs 1-4

Description.

Adult body length 1.90-2.60 mm; wing length 2.10-3.00 mm; wing width 0.70-1.10 mm.

Head: Ocellar tubercle polished; shiny spot on vertex large and distinct, extended from ocellus 2/3 distance to eye margin; depressed region of frons deep, velvet. Pedicel brownish on dorsal half, otherwise yellow; basal aristal rays minutely bifurcate apically; basal flagellomere yellow, infuscate dorsally. Face constricted medially by the anteroventral margin of the eyes, expanded into a ventral triangular region below level of pseudovibrissae and bearing a vertical, midfacial, yellow carina, facial triangle microtomentose, yellow to whitish yellow, bordered dorsolaterally with yellow stripe, facial setulae in yellow stripe, some specimens with blackish yellow on ventrolateral margin; gena when viewed anteriorly conspicuously silvery white microtomentose, in lateral view more yellowish tan; labellum and palpus pale yellow; face produced, very shallowly angulate. Chaetotaxy: Inner fronto-orbital setae slightly divergent, slightly smaller than lateral vertical seta; arista bearing 6-7 dorsal, 3 ventral rays; pseudovibrissae oriented dorsally; peristomal setae 6-7.

Thorax: Halter brown yellow to yellow; scutellum triangular, posteroapical angle rounded, orientation of scutellum moderately more elevated than scutum, disk a little convex; postpronotum sparsely microtomentose, subshiny to dull. Chaetotaxy: Dorsocentral setae 0+2, length of anterior seta subequal to posterior seta; mesonotal setulae moderately well-developed; scutellar setae 2, basal seta 1/2 length of apical seta. Wing: Hyaline, slightly fuscous; cells bm and dm separated by crossvein bm-cu; 1st costal ratio 2.6-2.9; 2nd costal ratio 2.2-2.7; wing ratio 0.35-0.36; crossvein bm-cu present. Legs mostly yellow; femora mostly yellow, gradually becoming blackish on apical 1/3; tibiae yellowish, blackish basally and especially apically; apical and subapical tarsomere of each leg blackish brown, 3rd tarsomere brown, basal 2 yellowish.

Male abdomen (Figs 1-4): 6th tergite about same width as dorsal portion of 7th tergite, both sclerites almost without setae; 4th and 5th sternites with well-developed lateral setae and a row of setae along posterior margin; 5th sternite twice as wide as long; 6th and7th sternite asymmetrically bilobed, left lobe much larger than medial lobe. Male terminalia (Figs 2-4): right surstylus in posterior view paddle-like with extended portion angulate ventromedially, lateral margin irregularly rounded, bearing setulae ventrally, basal stem narrowed, broadly stem-like; left surstylus elongate, somewhat digitiform, narrower than right surstylus, basal portion vertical, thereafter oriented ventromedially, apex moderately pointed, in lateral view elongate, almost parallel sided, pointed apically.

Female: Head: Ventral midfacial triangle black with silvery white microtomentum; gena densely microtomentose, silver except on facial carina where microtomentum is thin; basal flagellomere infuscate dorsally.

Thorax: Legs with femora and tibiae mostly brown.

Abdomen: 7th tergite and sternite separate; 7th tergite about 3/4 length of 6th tergite; 2 subequal, spherical spermathecae; sclerotized portion of spermathecal duct about 1/5 length of spermatheca.

Type material.

The holotype male is labeled "NEW ZEALAND [North Island:] WO Whangamarino Peat Bog [37°20.9'S, 175°06.8'E], malaise [sic] trap[,] 22 Nov-20 Dec 2006[,] C. H. Watts/Site 2: Manuka/Baumea/Empodisma/N.Z. Arthropod Collection, NZAC Private Bag 92170 AUCKLAND New Zealand [yellow]/HOLOTYPE ♂ Cyamops alessandrae Mathis and Sueyoshi NZAC [red]." The holotype is double mounted (glued to a paper point), is in fair condition (head partially collapsed), and is deposited in the NZAC. Twelve paratypes (8♂, 4♀; NZAC, USNM) bear the same locality label data as the holotype. Other paratypes are as follows:

NEW ZEALAND. North Island. WO: Kawhia, Taharoa (38°09'S, 174°44'E; Malaise trap), 22 Nov-20 Dec 2006, C. H. Watts (1♀; NZAC); Kopuatai Peat Bog (37°24.1'S, 175°34.1'E; Site 1: Sporodanthus & Site 2: Sporodanthus-Empodisma; Malaise trap), 22 Nov-20 Dec 2006, C. H. Watts (5♂, 4♀; NZAC).

Etymology.

The species epithet, alessandrae, is a genitive Latin patronym to honor and recognize the numerous contributions of Dr. Alessandra Rung to the study of Periscelididae and to the genus Cyamops specifically.