Corethrella (Corethrella) globosa Borkent, 2008

Published, First, 2008, The Frog-Biting Midges of the World (Corethrellidae: Diptera), Zootaxa 1804, pp. 1-456 : 67-68

Corethrella (Corethrella) globosa Borkent , new species

DIAGNOSIS: Male adult: unknown. Female adult: only extant species of Corethrella in the New World with flagellomeres 1–3 each very short, flagellomere 4 nearly as long as flagellomere 5 ( Fig. 26L), wing with R 2 elongate (longer than the stem of R 2+3) (Fig. 67G), uniformly pigmented wing (Fig. 67G), thorax ( Fig. 41D), and legs ( Fig. 41D).

DESCRIPTION: Male adult. Unknown.

Female adult. Descriptive statistics: see Tables 6–11. Head: Outline in anterior view somewhat circular (as in Fig. 7A). Coronal suture absent (as in Fig. 16C). Two large setae on frons between ventromedial area of ommatida (as in Fig. 16C). Antenna medium brown; pedicel without distinctive, more elongate, stout, dorsal or dorsolateral setae; flagellomeres as in Fig. 26L, sensilla coeloconica distributed as in Table 1; flagellomere 13 with well-developed apical bifurcation. Mandible with small, pointed teeth. Clypeus ( Fig. 17P) squarish or somewhat wider than long. Palpus ( Fig. 33R) brown; segment 3 swollen apically. Thorax (as in Fig. 41D): nearly uniformly brown, pale sclerites around base of wing. Posterior portion of dorsocentral row with 2 elongate setae situated somewhat lateral to one another. Prescutal suture elongate, interrupted by area of pale cuticle. Posterior portion of dorsocentral row with 2 elongate setae situated somewhat lateral to one another. Prescutal suture short, not extending more than half way to dorsocentral row of setae. Anterior anepisternum divided diagonally by sinuous suture, dorsal portion about equal to ventral portion. Ventral portion of posterior anepisternum not differentiated from dorsal portion, anterior margin more darkly pigmented than posterior margin. Wing (Fig. 67G): Apex of R 2 basal to apex of M 1. Plain, without pattern of pigmented veins and/or scales; veins (other than costa and wing margin) with only setae. Halter as dark as scutellum. Legs (as in Fig. 41D): Uniformly pigmented. With only slender setae, lacking scales (except for some in patch of whip-like setae on posterior portion of hind tibia). Midleg with thick, subapical setae on each of at least tarsomeres 1–3. Claws of each leg equal to those of others; equal on each leg, simple (without inner teeth). Empodia slender. Abdomen: Uniformly dark brown.

Immatures. Unknown.

DISTRIBUTION AND BIONOMICS: Corethrella globosa is known only from the Osa Peninsula in southwestern Costa Rica (Fig. 119A) at an altitude of 300 m. Specimens have been collected with a Malaise trap .

TAXONOMIC DISCUSSION: The type specimens were in only moderate condition, with collapse of some parts. A female from Sector Mata-Mata , PNN Amacayacu, Amazonas, Colombia, 150 m, 11–24-IV- 2000 ( CNCI) was similar to C. globosa but flagellomere 3 was comparatively longer and the apex of the hind femur was paler than the rest of the femur. It likely represents an undescribed species but was identified too late for inclusion in this study .

TYPES: Holotype, female adult on microscope slide, labeled " HOLOTYPE Corethrella globosa Borkent ”, “CR, Puntarenas, Peninsula de Osa, Rio Agujas , Est. Agujas, Send. Purruja. 300 m. 10–20-VIII- 1996. A. Azofeifa, LS 276750 526550, #32629, CD5079" ( INBC). 1 ♀ paratype labeled as for holotype ( CNCI).

DERIVATION OF SPECIFIC EPITHET: The name globosa (ball) refers to the short first flagellomere of females of this species.