Corethrella parallela Amaral & Pinho sp. nov.

urn:lsid:zoobank.org:act: A5BA259E-14FB-4800-AEEE-D66D5B27D481

Figs. 9–10

Type material. Holotype: ♂ adult: CUBA, Guantanamo province, Baracoa Municipality, Alejandro de Humboldt National Park, Monte Iberia, “Pez Pega” stream, site 2, 20°29'44"N, 74°43'32"W. Malaise trap. 29–31.X.2015, Orestes Bello-González leg. (Cuba04) (PERC) . Paratype: as holotype, except: site 3, 20°29'21"N, 74°44'35"W. (Cuba03) (CEMHS) .

Etymology. The specific name refers to the parallel margins of the aedeagus in this species.

Diagnosis. Adult male. Only extant species of Corethrella with posterior anepisternum undivided, dorsoventrally elongate (Fig. 9C); non-marginal wing veins with only setae (Fig. 9D); vein R 2 about same length or longer than R 2+3; R 2 reaching in steep angle; CuP reaching wing margin; aedeagus with parallel margins, abruptly tapering apically (Fig. 9D).

Description

Adult male (n = 2).

Head (Fig. 9A). Medium brown. Outline of head in anterior view laterally elongate; head W/L 1.37. Coronal suture complete, reaching ventral margin of interocular space (Fig. 10A). Clypeus nearly square, 1.15–1.35 times wider than long, with 3 dorsal setae (Fig. 10A). Palpus more lightly pigmented than the head; third segment clavate, about 1.25 the length of fifth. Mandibles not clearly visible, lacinia weakly sclerotized, with smooth margins. Antenna (Fig. 9A): pedicel medium brown, with at least one thicker, distinctive elongate dorsal seta; flagellum more lightly pigmented than head; flagellomeres I–II short, III moderately elongate, XI–XIII elongate; flagellomere XIII with apical bifurcation. Sensilla coeloconica distribution: 1(XII–XIII), 2(I). Cranial sensilla (Fig. 10A): Ocular row with 1 thick offset seta at ventral part; 10–11 thick setae extending shortly beyond vertex; vertex with few slender setae; Subocular row inconspicuous; Postgenal row with 7 slender setae. With 2 ventromedial thick setae.

Thorax (Fig. 9C). Light/medium brown, with a pale lateral band comprising anepisternum, dorsal portion of anepimeron, laterotergite, and metanepisternum. Prescutal suture elongate, almost reaching dorsocentral row of setae (Fig. 10B). Anterior anepisternum divided longitudinally by a sinuous suture. Posterior anepisternum undivided, dorsoventrally elongate. Sensilla (Fig. 10B): antepronotum with 4 intermediate setae distributed on anterior and central portions. Postpronotum with 1 thick dorsal seta and 3 slender/intermediate more posteriorly. Scutum, prescutal area, 2–3 thick setae on ventral anterior portion, with about 5 intermediate/thick setae surrounding. Antealar area with 1 thick seta near prescutal suture, with 3 thick setae on posteroventral region and about 17 slender/intermediate setae spread from ventral to dorsal portions. Supraalar area with 2 thick setae longitudinally aligned; about 5 slender setae surrounding. Dorsocentral row, posterior part with 2 thick setae; about 17 thick, 10 slender/intermediate setae completing the row. Scutellum with 6 thick setae. Posterior anepisternum with 3 intermediate setae centrally located. Anepimeron with 1 slender seta.

Wings (Fig. 9D). Light brown, without any pattern of pigmentation. Non-marginal veins with setae. Apex of R 2 basal to apex of M 1. Halter as dark as scutellum. Wing length 0.80–0.84 mm. R 3 /R 1: 0.44–0.50. R 2+3 /R 2: 1.07–1.20.

Legs (Fig. 9B). Medium brown; hind femur with basal 0.75 pale; hind tibia uniformly pigmented. Legs without scales. Midleg tarsomeres 1–3 with thick subapical setae. Tarsal claws on foreleg unequal; mid-, hind leg equal; apically inserted. Empodium thick, intermediate length, with 6 bifid branches (Fig. 10C). Apices of fore-, midtarsi not bilobed. Ta1/Ta2: 2.49–2.60. Ta3/Ta4: 1.17–1.24.

Abdomen (Fig. 9E). Uniformly medium brown.

Genitalia (Figs. 9E; 10D, E). Gonocoxite (Fig. 10D) uniformly medium brown, elongate; without distinctively elongate spicules on anteromedial area; dorsomedial row well-defined.With 5 dorsal to dorsomedial setae, somewhat thicker than other setae on gonocoxite, strongly tapering distally. With 1 dorsomedial stout seta, strongly tapered at apex, located at 0.39 gonocoxite length from base; without sclerotized plate at base. Gonostylus slender, curved subapically; subbasal seta stout, simple and dorsally located.Apical seta peg-shaped, blunt and squat (with its length only slightly exceeding its diameter). Aedeagus slender, with parallel margins, abruptly converging in pointed apex (Fig. 10E).

Adult female: Unknown

Immatures: Unknown

Remarks. This species keys to couplet 30 - C. yucuman Caldart & Pinho in Amaral et al. (2023). Corethrella parallela sp. nov. presents synapomorphies of species in the rotunda group proposed by Borkent (2008). These are: the posterior anepisternum undivided (unique apomorphy), wing without pattern of pigmentation (homoplastic across the family), and non-marginal veins with only setae (without scales). The latter only occurs in the clade composed of C. kerrvillensis (Stone), C. remiantennalis Borkent, C. blandafemur Borkent, C. brevivena Borkent, and C. globosa Borkent, plus the unplaced but probably related species, C. yucuman Caldart & Pinho, C. xokleng Amaral, Pinho & Mariano, and C. doryphallica sp. nov. It is possible to distinguish C. parallela sp. nov. from both C. yucuman and C. doryphallica sp. nov. by the pattern of pigmentation of the thorax: light/medium brown, with a pale band in C. parallela sp. nov., and uniformly medium/dark brown in C. doryphallica sp. nov. Moreover, the aedeagus with parallel margins is characteristic of C. parallela Amaral & Pinho sp. nov.