Chrysotus keyensis Runyon & Capellari, 2018

Runyon, Justin B. & Capellari, Renato S., 2018, Palpi aplenty: new species in the Chrysotus longipalpus species group (Diptera: Dolichopodidae), Zootaxa 4399 (4), pp. 579-585 : 581

Chrysotus keyensis Runyon & Capellari , sp. nov.

( Figs 4a, b , 5 )

Description. Male. Body length, 1.3–1.4 mm. Wing length, 1.1–1.2 mm, width, 0.4–0.5 mm. Head: Frons dark brown to black, with violet reflections; antenna wholly yellow; face yellow; proboscis yellow with yellow setae; palpus ( Figs 4a, b ) long, yellow, broadest basally, tapered and ending in nearly round, mostly black lamella; basal half with several long, yellow setae (ratio tibia I:palpus, 20:22) (MSSC). Thorax: Mesonotum and scutellum metallic green with violet reflections; mesopleuron brown with some bluish reflections and little pruinosity. Wing: Halter yellow, calypter brownish at apex. Legs. I: 24, 20, 11, 4, 3, 2, 2. II: 24, 24, 12, 6, 4, 2, 2. III: 28, 30, 7, 7, 4, 2, 2. Legs yellow except coxa II, base of coxa III, and apical tarsomeres which are brown. Setae on coxae yellow. Femur III with rather long, yellow ventral setae (longest about half width of femur) along full length (Key West specimen) or with long ventral setae only at base (Big Pine Key specimen). Hypopygium brown, not dissected; cercus yellow, short, with some brown hairs. Female. Body length, 1.4–1.5 mm. Wing length, 1.4–1.5 mm, width, 0.5–0.6 mm. Similar to male, except without MSSC and as noted. Head. Palpus a little enlarged, as long and as broad as face, dark brown, covered by brown setae that appear yellow in certain lights, with longest setae along apical margin. Antennal postpedicel brown. Legs. I: 22, 22, 12, 5, 3, 2, 2. II: 26, 29, 14, 6, 4, 3, 2. III: 30, 32, 8, 8, 4, 3, 2.

Etymology. Named for the Florida Keys, the coral archipelago where specimens were collected (Big Pine Key and Key West).

Material examined. HOLOTYPE ♂, “FLA: Monroe Co., Big | Pine Key (north end) | V-14-20-1990 | E. G. Riley, Malaise | trap, Pinelands”, “HOLOTYPE | ♂ Chrysotus | keyensis | Runyon & Capellari 2018 [red label]”. (USNM, type number USNMENT01447152). Paratypes: same data as holotype (1 ♀, USNM); Florida, Monroe Co., Key West, 22 November 2002, R. Hurley & J. Runyon (1 ♂, 3 ♀, MTEC).

Distribution. USA: Florida.

Remarks. There are small differences in the shape of the palpi and size of ventral setae on femur III between the male from Big Pine Key and the male from Key West. More specimens are needed to assess morphological variation and determine if these specimens might represent two species.

Specimens from Key West were collected south of the airport between salt ponds and the road (Road A1A) by sweeping moist, sandy soil of shaded trails.

Figures

FIGURE 5. Lateral male habitus of the holotype of Chrysotus keyensis sp. nov. Scale bar = 1 mm.

FIGURES 1–4. Heads of males of new species in the Chrysotus longipalpus species group. 1. Chrysotus plumarista sp. nov., dorsolateral view; inset shows male arista. 2. Chrysotus mystax sp. nov., anterior view. 3. Chrysotus mccreadiei sp. nov., anterior view.4. Chrysotus keyensis sp.nov.; a. anterodorsal view; b. lateral view. Scale bar = 0.5 mm.