Metriocnemus eryngiotelmatus Donato & Paggi, 2005, n. sp.
Creators: name: Donato, Mariano
name: Paggi, Analía C.
Publisher: name: Zenodo
Year: 2005
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Metriocnemus
Metriocnemus eryngiotelmatus

description: Metriocnemus eryngiotelmatus n. sp.   
 Type material: Holotype male with larval and pupal exuviae number 5183/1 (MLP), Punta Lara, 34°51.090'S 57°57.543'W, Buenos Aires, Argentina, 4­vii­2004, M. Donato, leg. Allotype female with larval and pupal exuviae number 5183/2 (MLP), Punta Lara, 34°51.090´S 57°57.543´W, Buenos Aires, Argentina, 4­vii­2004, M. Donato, leg.   
Paratypes: 2 males with larval and pupal exuviae numbers 5183/3–4 (MLP), Punta Lara, 34°51.090´S 57°57.543´W, Buenos Aires, Argentina, 4­vii­2004, M. Donato, leg.; male with larval and pupal exuviae number 5183/5 (MLP), Arroyo El Pescado y Ruta Nac. 11, 34°57.618´S 57°46.628´W, Buenos Aires, Argentina, 15­viii­2004, M. Donato, leg.; male with larval and pupal exuviae number 5183/6 (MLP), Ruta Prov. 51 cerca de Coronel Pringles, 37°54´57.6««S 61ϋ15´41.2´W, Buenos Aires, Argentina, 15­ii­2005, M. Donato, leg.; 3 females with larval and pupal exuviae numbers 5183/7­9 (MLP), Punta Lara, 34°51.090´S 57°57.543´W, Buenos Aires, Argentina, 4­vii­2004, M. Donato, leg.; female with larval and pupal exuviae numbers 5183/10 (MLP), Arroyo El Pescado y Ruta Nac. 11, 34°57.618´S 57°46.628´W, Buenos Aires, Argentina, 15­viii­2004, M. Donato, leg.  
 Other material examined: male with larval and pupal exuviae (MLP), Ruta Prov. 51 cerca de Coronel Pringles, 37°54´57.6 S 61°15´41.2´´W, Buenos Aires, Argentina, 15­ii­ 2005, M. Donato, leg.; 2 females with larval and pupal exuviae (MLP), Balneario Ferrando, Colonia del Sacramento, Uruguay, 10­x­2004, M. Donato, leg.; 5 larvae (MLP), Sierras de Aceguá, 31°51.429´S 54°19.230´W, Cerro Largo, Uruguay, 15­ii­2005, M. Donato, leg.   
 Additional material studied (in the collection of Dr. J. E. Sublette):   
 Metriocnemus costatus Sublette & Sasa: Holotype male, Barretal, Guatemala, number II­51, 22­i­81, Sasa, leg.; Allotype female, Barretal, Guatemala, number II­67 (on same slide with paratype male, pupal exuviae), 25­ii­81, Sasa, leg.; Paratypes: pupal male, Barretal, Guatemala, II­53, Sasa, leg.; 3 males, Barretal, Guatemala, number II­54, Sasa, leg.   
 Metriocnemus lautus Sublette & Sasa: Holotype male, Lavaderos, Guatemala, number II­56, 22­x­81, Sasa, leg.   
 Metriocnemus virgatus Sublette & Sasa: Holotype male, Rincón, Guatemala, number II­77 (larva mounted on same slide), 16­iii­81, Sasa, leg.; Allotype female, Barretal, Guatemala, number II­83 (on same slide with paratype male), 16­iii­81, Sasa, leg.; Paratype pupal male, number II­73, Sasa, leg.   
 Etymology: The species name “ eryngiotelmatus ” refers to Eryngium, the host plant, and telma, from Greek, meaning pool.   
 Male imago (n = 6, except when otherwise stated) (Figs. 2 A, C–E)   
Total length 3.13–3.92, 3.57 mm, Wing length 1.67–2.15, 1.88 mm; width 0.45–0.63, 0.53 mm. Total length/wing length 1.82–1.98, 1.89. Wing length/length of profemur 1.93–2.08, 1.99. Coloration uniformly dark brown with light spots at base of setae, mainly on thorax and abdomen.  
 Head. AR 1–1.25, 1.1 (n = 5). Antennae with 13 flagellomeres. Ultimate flagellomere 427.1–579.6, 503.9. Temporal setae 34–48, 39. Clypeus with 21–37, 32 setae. Cibarial pump, tentorium, and stipes as in Fig. 2 C. Tentorium 166.7–217.2, 194.9 µm long; 30.3– 45.4, 36.6 µm wide. Stipes 88.4–103.5, 96.9 µm long (n = 5); 30.3–63.1, 49.5 µm wide (n = 5). Palp segment lengths 42.9–50.5, 46.7; 35.3–65.6, 45.1; 189.4–284.7, 229.1; 138.9– 213.5, 172.7 (n = 5); 194.5–244.1, 215.1 (n = 5).   
Thorax (Fig. 2 D). Antepronotum with 9–16, 12 lateral setae. Dorsocentrals 61–102, 81; acrostichals 46–50, 48; prealars divided in two groups, anterior 13–21, 16, and posterior 13–29, 18; supraalars 2–3. Scutellum with 12–23, 16 fine setae, and 16–30, 22 coarse setae. Preepisternals 5–14, 10.  
Wing (Fig. 2 A). VR 1.19–1.28, 1.23. C extension 75.7–223.7, 158.8 µm long and with 45–74, 58 non marginal setae. Brachiolum with 6–9, 8 setae; R with 65–95, 76; R1 with 45–67, 55; R4+5 with 94–138, 122; RM with 3–9, 6; M with 16–33, 22; M3+4 with 53–70, 58; Cu with 53–95, 78; Cu1 with 31–54, 37; PCu with 117–153, 139. Wing membrane with setae covering most cells. Squama with 15–28, 21 setae.  
 Legs. Spur of front tibia 78.3–101.7, 88.5 µm long; spurs of middle tibia: 37.8–51, 43.0 and 42.9–53, 49.3 (n = 4); of hind tibia: 40.4–48, 44.4 and 75.7–98.5, 86.7 µm long (n = 5). Width at apex of front tibia 45.4–60.6, 53.8; of middle tibia 50.5–60.6, 55.1; of hind tibia 50.5–71.9, 63.3. Comb with 9–10 setae. Lengths (in µm) and proportions of legs in Table 1.   
 Hypopygium (Fig. 2 E). Without anal point. Setae on tergum IX 46 –52, 48 (n = 3), laterosternite IX with 5–7, 6 setae. Phallapodeme 108.6–98.5, 194.2 µm long; transverse sternapodeme 116.2–101.0, 111.7 µm long with oral projections. Without virga. Gonocoxite 285.4–227.3, 261.8 µm long; inferior volsella flat, ending at 0.59–0.66, 0.62. Gonostylus 143.9–118.7, 129.6 µm long; crista dorsalis low, almost straight; megaseta 10.3–8.8, 9.8 µm long. HR 2.15–1.8, 2.01; HV 3.04–2.6, 2.76.   
 Female imago (n= 5, except when otherwise stated) (Figs. 2 B, F–G)   
Total length 2.7–4.2, 3.2 mm, Wing length 1.57–2.02, 1.72 mm; width 0.5–0.7, 0.6 mm. Total length/wing length 1.6–2.1, 1.8. Wing length/length of profemur 1.85–1.95, 1.91. Coloration as in male.  
 Head. AR 0.2–0.32, 0.26. Lengths (in µm) of flagellomeres: 65.4–101.0, 86.3; 60.6– 75.7, 68.2; 58.1–90.9, 73.7; 58.1–85.8, 69.2; 73.2–88.4, 81.3. Temporal setae 48–82, 59. Clypeus with 37–54, 44 setae. Tentorium 138.9–161.6, 148.0 long; 20.2. 25.2, 24.2 wide. Stipes 85.8–113.6, 104.8 long; 53.1–75.7, 68.2 wide (n = 5. Palp segment lengths (in µm): 30.3–58.1, 44.9; 32.8–60.6, 47.4; 146.5–232.4, 197.5; 149.0–189.4, 173.7; 181.8–242.5, 220.2.   
Thorax. Antepronotum with 8–20, 13 lateral setae. Dorsocentrals 51–110, 80 in some specimens including 9 or 10 on humeral area; acrostichals 24–50, 36; prealars divided in 2 groups, anterior 8–31, 16, and posterior 14–35, 21; supraalars 2 or 3. Scutellum with 12– 20, 16 fine setae, and 14–35, 21 coarse setae.  
Wing (Fig. 2 B). VR 1.26–1.38, 1.31. Brachiolum with 8–16, 11 setae. Wing membrane with setae covering most cells. Squama with 15–22, 18 setae.  
Legs. Spur of front tibia 65.6–88.4, 75.2 long; spurs of middle tibia: 27.2–40.4, 31.7 and 32.8–42.9, 35.3; of hind tibia: 30.3–41.6, 35.1 and 32.8–42.9, 38.8 m long. Width at apex of front tibia 47.9– 63.1, 54.0; of middle tibia 50.5–65.6, 55.8; of hind tibia 60.6– 83.3, 71.2. Lengths (in µm) and proportions of legs in Table 2.  
 TABLE 1. Measurements (µm) and proportions of legs of male Metriocnemus eryngiotelmatus n. sp. Abbreviations: Femur (Fe); Tibia (Ti); Tarsomeres 1–5 (Ta1–5); Leg Ratio (LR), ratio of metatarsus to tibia; “Beinverhältnisse” (BV), combined length of femur, tibia, and basitarsus divided by combined length of tarsomeres 2–5; “Schenkel­Scheine­verhältnis” (SV), ratio of femur plus tibia to metatarsus.   
SV  
P1 2.61–2.8, 2.72  
P2 3.94–4.55, 4.34  
P3 3.72–3.98, 3.83  
 Genitalia (Fig. 2 F). Gonocoxite IX with apicomedial projection and rounded at end, with 26–36, 32 setae (n = 3). Gonapophysis VIII as shown in Fig. 2 G. Tergite IX subrectangular with 34–60, 50 setae (n = 3). Cercus 65.6–80.8, 73.2 µm long. Seminal capsule 68.2–88.4, 79.3. Notum 126.3–184.3, 155.6 µm long.   
 Pupa (n = 6, except when otherwise stated) (Figs. 3 F–J)   
Total length 4.03– 5, 4.35 mm. Exuviae hyaline.  
 Cephalothorax (Fig. 3 I). Frontal apotome sexually dimorphic; female apex (Fig. 3 F) more acute than male apex (Fig. 3 G). Distance between Dc1 and Dc2 18.9–63.1, 37.6 (n = 5); between Dc2 and Dc3 12.6–27.7, 23.04 (n = 4); between Dc3 and Dc4 7.5–15.1, 11.3 (n = 4).   
SV  
P1 2.72–2.84, 2.78  
P2 4.52–4.82, 4.7  
P3 3.58–3.94, 3.79  
 Abdomen (Fig. 3 H). Tergites III–VIII with apical row of tubercles. Tergum III–VIII with tubercles as follows (n = 5); 26–33, 29; 25–29, 27; 25–29, 28; 27–32, 29; 27–29, 28; 17–26, 23. Tergites III–VIII with basal band of clustered microtrichia of 3 types: simple, with 2 microtrichia usually clustered at base, and with 3 or 4 microtrichia usually clustered at base. Total number of microtrichia on Tergum III 152–182, 167 (n = 4). Anal lobe angular with 2 pale setae. Anal lobe length 214.7–265.2, 234.9 (n = 5). Genital sac length 176.8–237.4, 209.3 (n = 4).   
 Larva (n = 5, except when otherwise stated) (Figs. 3 A–E)   
 Total length 0.5–0.62, 0.54 mm (n = 3). Head capsule 99–120, 110 µm long. Coloration yellowish with head somewhat darker than body.   
 Head. Lengths of antennal segments (in µm): 20–23, 21.2; 4–7, 5.4; 1–3, 2.1; 1–2, 1.4; 0.5–1.5, 1. AR 0.4–0.5, 0.46. Basal antennal segment 8–9, 8.8 µm wide; distance from base to ring organ 5–6, 5.75 (n = 4); to basal mark of seta 8–10, 9.5; blade 9–12, 10.3 (n = 3). Setae I plumose; labral lamellae plumose. Mandible (Fig. 3 C) 53–65, 59.2 µm long, with 7 setae in seta interna. Mentum (Fig. 3 A) with central teeth lower than first pair of lateral teeth. Postmentum 69–80, 74.6 µm long.
description: Published as part of Donato, Mariano & Paggi, Analía C., 2005, A new Neotropical species of the genus Metriocnemus van der Wulp (Chironomidae: Orthocladiinae) from Eryngium L. (Apiaceae) phytotelmata, pp. 1-14 in Zootaxa 1050 on pages 3-10, DOI: 10.5281/zenodo.169974