Clinotanypus striatus, Oliveira & Silva & Trivinho-Strixino, 2013
Oliveira, Caroline Silva Neubern de, Silva, Fabio Laurindo da & Trivinho-Strixino, Susana, 2013, Four new species of Clinotanypus Kieffer, 1913 (Diptera: Chironomidae: Tanypodinae) from Neotropical region, Journal of Natural History (J. Nat. Hist.) 48 (5 - 6), pp. 317-343 : 336-342
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Clinotanypus striatus sp. nov.
Holotype male with pupal and larval exuviae, BRAZIL, SP, Pirassununga , Aquaculture Research and Training Center – CEPTA / IBAMA, 21 ◦ 55 ′ 44 ′′ S, 47 ◦ 22 ′ 23 ′′ W, 627 m a.s.l., 2009, S. T. Strixino GoogleMaps . Paratype: pharate pupa with larval exuviae, same data as holotype except 14 September 2010; 2 males GoogleMaps with pupal and larval exuviae, same data as holotype except 14 September 2010 GoogleMaps ; male with pupal and larval exuviae, same data as holotype except 20 September 2010 GoogleMaps ; pharate pupa with larval exuviae, same data as holotype except 20 September 2010 GoogleMaps .
From Latin, striatus , meaning stripe, referring to the three dorsal brown bands on thorax of male.
Clinotanypus striatus sp. nov. differs from other Clinotanypus species by the combination of the following characters. Male: thorax with 3 dorsal brown bands, anal point bilobed and gonostylus with 6 setae. Pupa: base of scar with shagreenation and segment VII with 6 taeniae. Larva: shape of mandible and its row of setae at the lateral outer margin; palp segment and procercus 206–215 µm long.
Adult male (n = 3)
Dimensions. Total length 4.70–5.08 mm. Wing length 1.93–2.32 mm. Total length / wing length 2.03–2.63. Wing length / length of profemur 2.24–2.71.
Coloration. Head, pedicel, antenna and maxillary palp brown. Thorax with microtrichia, yellow; antepronotum with two brown vertical spots; scutellum, postnotum, anepisternum and preepisternum brown. Wing membrane transparent without spots, veins brown and macrotrichia on C and R 1 veins. Legs pale brown with dark brown bands as in Figure 10D–F View Figure 10 . Abdomen pale brown and hypopygium yellow.
Head ( Figure 10A View Figure 10 ). Antenna with 14 flagellomeres, AR 2.08–2.18, flagellum 1331–1600 µm long. Temporal setae 22–26, multiserial ( Figure 10A View Figure 10 ). Eyes bare, with dorsomedian extension containing 3–4 terminal facets. Tentorium 190–249 µm long, stipes not measurable. Clypeus not measurable, bearing 13–25 setae. Cibarial pump with anterior margin concave, 306 (1) µm long. Palpomere lengths 1–5 (in µm): 64–70; 76–100; 160–188, 203–227; 276–342.
Thorax ( Figure 10B View Figure 10 ). Antepronotum with 11–18 lateral setae; acrostichals biserial; dorsocentrals merging with the acrostichals posteriorly; prealars 44–53; supraalars 1; scutellars 15–19; postnotals 34–50; posterior anepisternals 5; epimerals 2–3 (2); preepisternals divided into two groups, group I with 17–31 setae and group II with 15–27 setae, as in Figure 10B View Figure 10 .
Wing ( Figure 10C View Figure 10 ). Width 0.61–0.77 mm long. Costa 1.32–2.30 mm long, produced beyond R 4+5. R 1 with 28–37 (2) setae. VR 0.82–0.85. WW 0.32–0.33. Brachiolum with 2 setae. Squama with 26–34 setae.
Legs ( Figure 10D–I View Figure 10 ). Fore leg: tibia one apical spur 66–75 µm long ( Figure 10G View Figure 10 ). Mid leg: tibia with two apical spurs 65–69; 49–60 µm long ( Figure 10H View Figure 10 ); tarsomeres 1–3 each with two pseudospurs 37–41, 37–40 and 35–39 µm, respectively. Hind leg: tibia with two apical spurs 82–94; 57–63 µm long ( Figure 10I View Figure 10 ); tarsomeres 1–3 each with one pseudospur 41–42, 33–34 and 25–26 µm, respectively; double comb present. All legs with claws pointed. Pulvilli absent. Lengths and proportion of leg segments as in Table 4.
Hypopygium ( Figure 10J View Figure 10 ). Tergite IX with irregular row of 18–38 (2) dorsal setae. Anal point bilobed. Phallapodeme long and wide, 94–96 µm long. Sternapodeme curved anteriorly, 135–139 µm long. Gonocoxite conical, 230–255 µm long, with slightly concave inner margin. Gonostylus simple, 114–122 µm long; megaseta 17–18 (2) µm long. HR 2.03–2.10. HV 3.88–4.46.
Pupa (n = 3)
Coloration. Exuviae pale brown with brown spots. Thoracic horn mostly brown.
Cephalothorax ( Figure 11A View Figure 11 ). Wing sheath 1.46–1.61 mm long and 0.51–0.58 mm wide. Frontal apotome (1) µm wide. Thoracic horn 449–500 µm long and 144–164 µm wide, with spinules on the surface; plastron plate large, 198–219 µm long ( Figure 11A View Figure 11 ); aeropyle tube 254–285 µm long. Respiratory atrium tubular. Basal lobe present.
Abdomen ( Figure 11B View Figure 11 ) 3.69–4.15 mm long. Tergites I–VII with shagreen consisting of sparse and solitary spinules. T I with pigmented scar, 156–190 µm long, with shagreenation at the base. Dorsal chaetotaxy as in Figure 11B. T View Figure 11 VII with 6 taeniae. T VIII with 5 taeniae. Anal lobe as in Figure 7H View Figure 7 , 763–831 (2) µm long and 688–775 (2) µm wide, with two anal macrosetae. Genital sac smaller than anal lobe, with 294–319 µm long. GS / AL 0.38–0.42.
Fourth instar larva (n = 3)
Coloration. Head pale yellow, postoccipital margin brown; antenna pale yellow; distal tooth of mandible brown; ligula pale yellow. Abdomen pale yellow, procercus, anal setae and posterior parapod claws pale yellow.
Antenna. Length 682–696 µm long, A 1 636–650 µm long, with ring organ placed 486–575 µm from base, A 2 31–39 µm long. AR 13–14.
Maxilla ( Figure 12B View Figure 12 ). Palp segment 123–132 µm long and 14–15 µm wide, with ring organ 54–69 µm from base,A 1 / P 14.83 –5.21, A 2 / P 1 0.23–0.32.
Mandible ( Figure 12C View Figure 12 ). Length 96–118, with 3 lateral setae. A 1 / MD 5.50–6.62. Row of setae at the lateral outer margin present.
Hypopharyngeal complex ( Figure 12 View Figure 12 Ea,b). Ligula 96–97 (2) µm long, maximum width 44 –45 (2) µm, with 6–7 accessory teeth, anterior toothed margin slightly concave. Paraligula pectinate, 50–55 (2) µm long. Pecten hypopharyngis with 20 teeth equal in size.
Body. With lateral fringe. Anterior parapods with simple claws. Procercus 206–215 µm long, 60–66 µm wide, with 14 anal setae 733 (1) µm long. L / W 3.12–3.58. Supraanal seta 664 (1) µm long. Anal tubules not measurable. Posterior parapod apex with 10 simple and 5 hook-shape claws.
The larva of Clinotanypus striatus was collected from sandy sediments in a reservoir at the Aquaculture Research and Training Center, in Pirassununga, São Paulo.
Tavera, Department of Geology and Geophysics
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