Mesosmittia museophila, Donato, Mariano, 2011

Donato, Mariano, 2011, A new species of the genus Mesosmittia Brundin, 1956 (Diptera: Chironomidae) from the Neotropics with a cladistic analysis of the genus using quantitative characters, Zootaxa 2836, pp. 51-61 : 53-56

publication ID	https://doi.org/ 10.5281/zenodo.206685
DOI	https://doi.org/10.5281/zenodo.5686083
persistent identifier	https://treatment.plazi.org/id/039587A0-FFC0-FFD6-91F6-F9D7FADDFECC
treatment provided by	Plazi
scientific name	Mesosmittia museophila
status	sp. nov.

Treatment

Mesosmittia museophila View in CoL n. sp.

Material examined. Holotype male, MLP number 5307/1, ARGENTINA, Buenos Aires, La Plata, 34º 54’ 30.9’’S – 57º 56’ 21.8’’W, 8–IV–2005, sweep net, M. Donato; paratypes: 7 males, MLP numbers 5307/2–6 and 2 males in ZMBN, same data as holotype.

Other material examined. Mesosmittia mina Saether , holotype male, U.S.A., Georgia, Clarke Co., Athens, Oconee River ( ZMBN). Examined by Professor Ole A. Saether.

Etymology. Referring to the species swarming in the forest surrounding the La Plata Museum, using the Greek philus = friend as a suffix.

Diagnosis. distinguished from all other species of the genus by the presence of a notch on the ventral margin of the gonocoxite, except for Mesosmittia mina . M. museophila is separable from this species by the shorter and blunter preapical projection of the gonocoxite instead of the preapical projection sharply pointed and triangular in M. mina .

Male imago (n = 8–10)

Total length 1.96–2.43, 2.13 [2.36] mm. Wing length 1–1.13, 1.08 [1.11] mm. Total length/wing length 1.81– 2.23, 2.00 [2.13]. Wing length/length of profemur 2.29–2.76, 2.51 [2.47]. Coloration uniformly dark brown with legs light brown.

Head. Antennae with 13 flagellomeres, AR 1.17–1.48, 1.34 [1.43], ultimate flagellomere length 350–430, 400 [430]. Temporal setae 6–9, 7 [6], divided in 1–3, 2 [1] inner verticals and 4–6, 5 [5] outer verticals. Clypeus with 4– 9, 8 [6] setae. Cibarial pump, tentorium and stipes as in Figure 1 View FIGURES 1 – 4 . Tentorium 123–152, 137 [152] long and 17–27, 24 [25] wide. Stipes 100–118, 110 [118] long and 7–12, 7 [7] wide. Palpomere lengths: 24–29, 27 (9) [27]; 39–56, 49 [56]; 69–86, 78 [78]; 64–83, 69 [78]; 93–113, 100 [100].

Thorax. Antepronotum with 0–2, 1 [0] lateral setae. Dorsocentrals 6–9, 7 [8]; acrostichals 8–12, 10 [10]; prealars 3–5, 4 [3]; supraalars 1; scutellars 5–8, 5 [6].

Wing ( Fig. 2 View FIGURES 1 – 4 ). VR 1.26–1.45, 1.39 [1.43]. C extension 12–24, 20 [22] long. Brachiolum with 1 seta; R with 0– 2, 1 [0]; R1 with 0–1, 0 [0]; R4+5 with 0–1, 0 [0]; squama with 2–7, 4 [4] setae.

Legs. Spur of fore tibia 32–44, 39 [32] long (9); spurs of mid tibia: 15–17, 17 [17] and 17–24, 20 [24]; of hind tibia: 12–17, 16 [15] and 29–42, 37 [39] long. Width at apex of fore tibia 24–32, 29 [27]; of mid tibia 24–37, 29 [29]; of hind tibia 32–47, 38 [39]. Comb with 9–12, 9 [9] setae. Lengths (in mm) and proportions of legs in Table 1 View TABLE 1 .

Hypopygium ( Figs. 3–6 View FIGURES 1 – 4 View FIGURES 5 – 6 ). Without microtrichia on apex of “anal point”. Setae on tergite IX 9–15, 11 [9], laterosternite IX with 4–7, 5 [5] setae. Phallapodeme 37–54, 46 [54] long; transverse sternapodeme 74–103, 92 [96] long. Virga 27–42, 29 [29] long. Gonocoxite 169–203, 195 [196] long; length of gonocoxite to apex of inferior volsella/ length of gonocoxite 0.16–0.24, 0.22 [0.22], distance along inner margin from gonocoxite to apex of inferior volsella 71–91, 86 [91]. Ventral margin of gonocoxite with a notch. Gonostylus 83–105, 91 [91] long; crista dorsalis low, almost straight; megaseta 5–7, 5 [5] long. HR 1.86–2.23, 2.09 [2.15]; HV 2.07–2.61, 2.34 [2.59].

Figures

Tables

TABLE 1. Lengths (in μm) and proportions of legs of Mesosmittia museophila sp. n. (male) (n = 8 – 10) ..

p1 p2 p3	fe 380–450, 435 [420] 430–500, 470 [460] 450–540, 490 [490]	ti 520–630, 575 [530] 470–550, 495 [490] 540–630, 580 [570]	ta1 240–290, 260 [260] 200–220, 210 [200] 300–320, 310 [300]	ta2 140–170, 155 [150] 100–120, 110 [120] 150–170, 170 [160]
p1 p2 p3	ta3 100–120, 115 [110] 80–100, 85 [90] 130–150, 140 [130]	ta4 70–90, 80 [70] 50–70, 60 70–80, 75 [80]	ta5 60–70, 70 [70] 50–70, 60 60–70, 70 [70]	LR 0.43–0.49, 0.46 [0.49] 0.38–0.43, 0.41 [0.41] 0.49–0.58, 0.53 [0.53]
p1 p2 p3	BV 2.90–3.16, 3.05 [3.03] 3.55–3.94, 3.81 2.93–3.27, 3.11 [3.09]	SV 3.65–4.00, 3.76 [3.65] 4.57–5.00, 4.75 [4.75] 3.19–3.77, 3.51 [3.53]