Ablabesmyia monticola Dantas & Hamada 2019, sp. n.
Creators: name: Dantas, Galileu P. S.
name: Hamada, Neusa
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Ablabesmyia
Ablabesmyia monticola

description: Ablabesmyia monticola sp. n.
Type material. Holotype: male, BRAZIL, Roraima, Serra da Mocidade, 01°42'22.5"N, 61°47'07.9"W, 29– 30.i.2016, light-trap, J.M. Cavalcante (INPA). Paratypes: 1 male, as holotype.
Diagnostic characters. Adult male: Tergite IX with 3 dorsal setae on each side; transversal sternapodeme robust, anteriorly projected, with anterior margin rounded; dorsal lobe club-shaped, with some apical tubercles bearing setae; aedeagal blades striated, slightly curved at apex; forefemur with 3 bands, fore tibia with 5 bands, the third small and incomplete. Mid femur with 2 bands, mid tibia with 4 bands. Hind femur with 1 band, hind tibia with 3 bands.
Etymology: From Latin montis = mountain and incola = inhabitant, referring to the mountainous habitat where the specimens were collected.
Adult male (n = 1–2). Total length 3.45–3.76 mm. Wing length 1.82–2.07 mm. Total length/wing length 1.82– 1.90. Wing length/length of forefemur 2.26–2.52.
Coloration. Thorax brown (Fig. 6B). Wing with patterns of brown spots as in figure 6C. Forefemur with 3 bands, foretibia with 5 bands, the third small and incomplete. Mid femur with 2 bands, mid tibia with 4 bands. Hind femur with 1 band, hind tibia with 3 bands. Abdomen (Fig. 7A) pale yellow with dark markings; tergites III–V with 2 dark brown spots anterolaterally; tergites VI–VII mostly dark brown; tergites VIII light brown; hypopygium mostly pale yellow.
Head (Fig. 6A). Antennal flagellum 1070 µm long, apical flagellomere 98 µm long, 25 µm wide, pre-apical seta 28 µm long, pedicel 155 µm wide, with 3 setae. AR 1.49. Eyes bare; dorsomedial extension well developed, 137 µm long, 72 µm wide, medially separated by distance of 119 µm. Temporal setae 36–45, multiserial anteriorly and uniserial posteriorly. Clypeus 124–130 µm long, 80–91 µm maximum width, with 37–54 setae. Cibarial pump with anterior margin strongly concave, 305–313 µm long, orifice located 131 µm from apex. Tentorium 185–200 µm long. Palpomeres 1–4 (µm): 45–47; 98–105; 130–140;122–130. Third palpomere with 1 campaniform sensilla.
Thorax (Fig. 6B). Antepronotum with 17–18 lateral setae. Acrostichals about 60–66, biserial, diverging posteriorly; dorsocentrals 35–40, multiserial anteriorly and uniserial posteriorly; prealars 24–26, multiserial; supraalar 1. Scutellum with 35–36 setae.
Wing (Fig. 6C). Width 0.60–0.66 mm. Costal vein 1.69–1.94 mm long, not produced beyond apex of R 4+5, ending before apex of M 1+2. Brachiolum with 4–5 setae. Squama with 42–46 setae. Anal lobe well developed. VR 0.84–0.88. WW 0.32–0.33.
Legs (Figs. 1 D–F). Foretibia 48–54 µm wide at apex, with one apical spur 52–60 µm long, bearing 11–13 lateral teeth. Mid tibia 46–53 µm wide at apex, with two apical spurs, 42–45 and 56–61 µm long, bearing 6 and 8 lateral teeth, respectively. Hind tibia 52–58 µm wide at apex, with two apical spurs, 50–52 and 57–62 µm long, bearing 6 and 7–8 lateral teeth, respectively; tibial comb indistinct, with 5 bristles. Lengths and proportions of leg segments as in Table 3.
Hypopygium (Figs. 7 B–E): Tergite IX with 3 dorsal setae on each side; anal point partially covering aedeagal complex; phallapodeme 55 µm long; transversal sternapodeme robust, anteriorly projected, with anterior margin rounded (Fig. 7D), 40 µm long at base; gonocoxite 158–165 µm long; gonostylus 165 µm long, with 4 apical teeth, and tapered megaseta; HR 1.0; HV 2.28. Aedeagal complex with striated blade 39–42 µm long, slightly curved at apex and widened at the base; dorsal lobe club-shaped, 11–14 µm long and 11–14 µm wide, with some apical tubercles bearing setae (Figs. 7 B–C, E); lateral lobe present; lateral filaments well developed; basidorsal lobe evident.
Female imago and immatures. Unknown.
Taxonomic remarks. Ablabesmyia monticola sp. n. resembles A. martha Neubern and A. akemiae sp. n. by the general coloration pattern of the legs, but it is easily distinguished by the number of bands on femurs and tibiae and the morphology of the dorsal lobe. The numbers of bands in the fore, mid and hind femurs are 3, 2, 1, respectively, in A. monticola sp. n., whereas 2, 2, 1, respectively, in A. martha and A. akemiae sp. n. Likewise, the numbers of bands in the tibiae are 5, 4, 3, respectively, in A. monticola sp. n., whereas 4, 4, 3, respectively, in A. martha and 5, 4, 4, respectively, in A. akemiae sp. n.. Furthermore, in A. monticola sp. n. transversal sternapodeme is robust and anteriorly projected and dorsal lobe is club-shaped, with some apical tubercles bearing setae. In contrast, in A. martha the transversal sternapodeme is slender and the dorsal lobe pointed, while in A. akemiae sp. n. the transversal sternapodeme is robust and somewhat rectangular-shaped and dorsal lobe is club-shaped, with apical brush.
Notes on biology. The males of Ablabesmyia monticola sp. n. were collected with light-trap in a mountainous region at about 1000 m above s.l. The trap was placed over a small stream (1–2 meters wide), with sand bottom, partially covered with deciduous leaves from a dense riparian forest.
Distribution. The species is known only from the type locality in the Serra da Mocidade National Park, Caracaraí, Roraima State, Brazil (Fig. 5).
description: Published as part of Dantas, Galileu P. S. & Hamada, Neusa, 2019, Three new neotropical species of Ablabesmyia Johannsen, 1905 (Diptera: Chironomidae), pp. 111-129 in Zootaxa 4567 (1) on pages 119-122, DOI: 10.11646/zootaxa.4567.1.6, http://zenodo.org/record/2593054