Labrundinia reniformis Silva

Silva, Fabio Laurindo Da, Fonseca-Gessner, Alaide Aparecida & Ekrem, Torbjørn, 2014, A taxonomic revision of genus Labrundinia Fittkau, 1962 (Diptera: Chironomidae: Tanypodinae), Zootaxa 3769 (1), pp. 1-185 : 133-135

publication ID

https://doi.org/ 10.11646/zootaxa.3769.1.1

publication LSID

lsid:zoobank.org:pub:705567C6-C912-4A19-9DE2-726254E17076

DOI

https://doi.org/10.5281/zenodo.5621087

persistent identifier

https://treatment.plazi.org/id/676987A8-B786-FF57-FF29-FD97FA90F82D

treatment provided by

Plazi

scientific name

Labrundinia reniformis Silva
status

sp. nov.

Labrundinia reniformis Silva View in CoL sp. n.

( Figs 64–66 View FIGURES 64 A – M View FIGURES 65 A – E View FIGURES 66 A – J )

Labrundinia View in CoL sp. 6 Silva et al. 2013: 600 (DNA barcodes).

Material examined. Type material: Holotype male with pupal and larval exuviae, Brazil: São Paulo, Gália, Caetetus Ecological Station, 1st dam before the Barreiro reservoir, 08.vii.2008, F. L. Silva & J. F. Nunes ( MZUSP). 5 Paratypes: 3 males with pupal and larval exuviae same data as holotype except for, Canchin reservoir, 6.i.2009 ( NTNU). 1 male with pupal and larval exuviae same data as holotype except for, 2.ii.2009 ( NTNU). 1 female with pupal exuviae same data as holotype except for, 2.ii.2009 ( NTNU).

Etymology. Derived from the Latin reniformis , meaning kidney-like, and refers to the shape of pupal thoracic horn.

Diagnostic characters. Labrundinia reniformis sp. n. differs from other Labrundinia species by the combination of the following characters. Adult male: abdominal tergites II–VI with continuous brown transverse band near proximal margin, T VII–VIII almost completely brown; hypopygium pale brown, sternapodeme with much reduced anterior process, hypopygium ratio 1.61–1.77. Pupa: thoracic horn kidney-shaped, preapical indentation reduced, thoracic horn about 1.75–2.08 times as long as wide. Larva: Surface of head capsule covered with small spinules; lateroventral and posteroventral spine groups absent; subbasal seta of posterior parapod simple; serrated claw present; bifid claw with V-shaped lower indentation.

Description. Adult male (n = 5)

Size. Total length 1.9–2.3 mm. Wing length 1.2–1.3 mm. Total length/wing length 1.53–1.71. Wing length/ profemur length 2.94–2.97 (4).

Coloration. Head pale brown with dark brown occipital margin; pedicel and antenna brown; maxillary palp brown. Thorax brown with dark scutum; antepronotum pale brown. Wing membrane transparent without any marking. Legs pale brown. Abdominal tergites II–VI with continuous brown transverse band near proximal margin, T VII–VIII almost completely brown; hypopygium pale brown ( Fig. 64L View FIGURES 64 A – M ).

Head ( Figs 64A–E View FIGURES 64 A – M ). Temporal setae 11–12 (4), uniserial ( Fig. 64B View FIGURES 64 A – M ). Eye ratio 0.89–0.90 (2). Tentorium ( Fig. 64C View FIGURES 64 A – M ) 150–158 (3) Μm long. Clypeus 71–100 (4) Μm long, 57–59 (4) Μm wide at largest part, bearing 11–16 (4) setae. Cibarial pump 177–204 (4) Μm long ( Fig. 64D View FIGURES 64 A – M ), with anterior margin concave. Lengths of palpomeres 1–5 (in Μm): 34–43 (4); 50–65 (4); 114–137 (3); 130–146 (4); 170 (1). Antennal flagellum 676–820 Μm long, diameter of pedicel 103–124 Μm, apical setae single ( Fig. 64E View FIGURES 64 A – M ), AR 1.09–1.27.

Thorax. Antepronotum with 1–2 lateral setae. Acrostichals 30–38, biserial, diverging evenly posteriorly, starting close to antepronotum and almost reaching scutellum; dorsocentrals 16–22, irregularly uniserial; prealars 7; supraalars 2. Anapleural suture ratio 0.47–0.61. Scutellum with transverse row of 6–8 setae and group of numerous fine anterior setae.

Wing ( Fig. 64F View FIGURES 64 A – M ). Width 0.3–0.4 (4) mm. Costa 1.0–1.2 (4) mm long. R2+3 absent. VR 0.72–0.81 (3). WW 0.27– 0.28 (4). Brachiolum with 2 setae. Squama setiferous.

Legs ( Figs 64G–K View FIGURES 64 A – M ). Fore leg: width at apex of tibia 32–41 (4) Μm ( Fig. 64G View FIGURES 64 A – M ), tibia with single, apical and pectinate spur 14–17 (4) Μm long ( Fig. 64H View FIGURES 64 A – M ), with three lateral teeth and two preapical setae; ta1-4 without any preapical pseudospurs. Mid leg: width at apex of tibia 30–37 Μm long ( Fig. 64I View FIGURES 64 A – M ), tibia with single, apical and pectinate spur 18–23 Μm long with three lateral teeth ( Fig. 64J View FIGURES 64 A – M ) and two preapical setae; ta1-4 each with two preapical pseudospurs. Hind leg: width at apex of tibia 33–37 Μm long ( Fig. 64K View FIGURES 64 A – M ), tibia without spur; comb with 6 bristles; ta1-4 without any preapical pseudospurs. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 43.

fe ti ta1 ta2 ta3

p1 407–497 437–531 350–434 211–269 153–212 p2 506–630 407–530 537–716 242–321 144–178 p3 500–557 570–688 624–746 263–333 174–211

ta4 ta5 LR BV SV

p1 106–146 73–81 0.80–0.83 2.08–2.20 2.37–2.41 p2 97–123 63–81 1.31–1.46 2.53–2.74 1.56–1.70 p3 112–122 79–88 1.01–1.08 2.64–2.82 1.67–1.78 Hypopygium ( Fig. 64M View FIGURES 64 A – M ). Tergite IX arched, with 8–11 posterior setae. Membranous anal point rounded, apical edge slightly convex. Phallapodeme 44–54 Μm long. Sternapodeme with much reduced anterior process. Gonocoxite cylindrical, 94–106 (4) Μm long, 45–56 (4) Μm wide, with slightly concave inner margin. GcR 1.88– 2.10 (4). Gonostylus simple and slender, 53–69 Μm long; megaseta 9–12 Μm long. HR 1.61–1.77. HV 3.30–3.55.

Adult female (n = 1)

Size. Total length 1.3 mm. Wing length 1.0 mm. Total length/wing length 1.27. Wing length/ profemur length 2.81.

Coloration. Head pale brown with dark brown occipital margin; pedicel and antenna brown; maxillary

palp pale brown. Thorax brown with dark scutum; antepronotum pale brown; supraalar callus pale brown. Wing membrane transparent without any marking. Legs pale brown. Abdomen brown. Seminal capsules brown.

Head. Temporal setae 10, uniserial. Eyes ratio 0.93. Tentorium 137 Μm long. Clypeus 77 Μm long, 57 Μm wide at largest part, bearing 18 setae. Cibarial pump 193 Μm long, as in male. Lengths of palpomeres 1–4 (in Μm): 35; 48; 98; 124; palpomeres 5 broken off. Antennal flagellum not measurable.

Thorax. Antepronotum with 2 lateral setae. Acrostichals 37, irregularly biserial, starting close to antepronotum; dorsocentrals 30, irregularly uniserial; prealars 10; supraalars 2. Scutellum with transverse row of 10 setae and group of numerous fine anterior setae.

Wing. Width 0.4 mm. Costa 0.9 mm long. R2+3 absent. VR 0.68. WW 0.38. Brachiolum with 2 setae. Squama setiferous.

Legs. Fore leg: width at apex of tibia 42 Μm, tibia with single, apical and pectinate spur 18 Μm long, with three lateral teeth and two preapical setae; ta1-4 without any preapical pseudospurs. Mid leg: width at apex of tibia 34 Μm long, tibia with single, apical and pectinate spur 20 Μm long with three lateral teeth and two preapical setae; ta1-4 each with two preapical pseudospurs. Hind leg: width at apex of tibia 43 Μm long, tibia without spur; comb with 5 bristles; ta1-4 without any preapical pseudospurs. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 44.

Genitalia. Gonapophysis VIII broadly rounded, 51 Μm long. Coxosternapodeme 59 Μm long. Postgenital plate rounded. Cerci oval-quadrate, 53 Μm long and 15 Μm wide; with 5 elongated setae. Labia with inconspicuous microtrichia. Notum length 96 Μm long. Seminal capsules oval, 46 Μm long, 28 Μm wide, with conical shaped necks. Length ratio SCa/No 0.48.

Pupa (n = 6 unless otherwise stated)

Size. Abdomen 1.7–2.4 mm long in male.

Coloration. Exuviae mostly pale brown; thoracic horn and apex of anal lobe brown.

fe ti ta1 ta2 ta3

p1 366 383 349 165 122 p2 540 411 494 242 163 p3 456 545 560 206 128

ta4 ta5 LR BV SV p1 92 75 0.91 2.42 2.13 p2 118 90 1.20 2.35 1.92 p3 84 80 1.02 3.13 1.78 Cephalothorax ( Figs 65A–C View FIGURES 65 A – E ). Frontal apotome smooth ( Fig. 65A View FIGURES 65 A – E ). Wing sheath smooth 0.7–1.0 mm long. Thoracic horn 247–307 Μm long and 124–169 Μm wide ( Fig. 65B View FIGURES 65 A – E ), THR 1.75–2.08, preapical indentation moderately deep. Membranous preapical papilla 21–38 Μm long ( Fig. 65C View FIGURES 65 A – E ), PTH 0.07–0.14, aeropyle tube simple, short, 17–26 (3) Μm long; plastron plate small. Horn sac well developed, completely filling respiratory atrium. External membrane with pale spinules basally concentrated. Basal lobe wedge-shaped. Thoracic comb with 7–9 conical tubercles ( Fig. 65B View FIGURES 65 A – E ).

Abdomen ( Figs 65D–E View FIGURES 65 A – E ). Tergite I with scar 108–136 Μm long. T I–VI without shagreen, T VII–VIII with shagreen basally concentrated. Abdominal chaetotaxy as in figure 65D. Abdominal segment VII with 3 LS-setae. A VIII with 5 LS-setae. Anal lobe 282–305 (5) Μm long and 131–176 (5) Μm wide ( Fig. 65E View FIGURES 65 A – E ), outer margins sclerotized, with 6–11 spines, longest spine 20–23 (5) Μm long, inner margins of lobes membranous. ALR 2.06– 2.30 (5). Male genital sac not surpassing apex of anal lobe.

4th instar larva (n = 5 unless otherwise stated)

Coloration. Head pale yellow, without maculation; postoccipital margin brown. Second antennal segment brown; distal tooth of mandible and apex of ligula brown. Abdomen pale yellow; procercus and anal setae pale brown. Posterior parapod claws all pale yellow.

Head ( Fig. 66A View FIGURES 66 A – J ). Length 434–525 Μm, 271–323 Μm wide. IC 0.59–0.65. Surface covered with small spinules; lateroventral and posteroventral spine groups absent. Ventral cephalic setae S9 and S10 and SSm forming a straight line diagonal to longitudinal axis of head capsule ( Fig. 66A View FIGURES 66 A – J ).

Antenna ( Figs 66B–C View FIGURES 66 A – J ). Length 253–285 Μm, A1 170–195 Μm long, with ring organ located 0.88 (1) from base, A2 70–80 Μm long. AR 1.93–2.15. Blade longer than A2 over-reached by accessory blade.

Maxilla ( Fig. 66D View FIGURES 66 A – J ). Basal palp segment 22–30 Μm long and 0.56–0.71 Μm wide at the middle, with ring organ located 14–17 (2) from base. PR 2.68–4.15. APR 5.88–7.84.

Mandible ( Fig. 66E View FIGURES 66 A – J ). Length 61–85 Μm. Sensillum campaniformium located 0.64–0.81 from apex, basal tooth bifid, with seta subdentalis projecting from sloping end towards apical tooth, accessory tooth present, AMD 2.25– 2.85.

Mentum and M appendage . Dorsomental teeth reduced; pseudoradula uniformly granulate.

Hypopharyngeal complex ( Figs 66F–G View FIGURES 66 A – J ). Ligula 52–62 Μm long, 25–26 Μm wide, with row of 5 teeth. IO 0.95– 0.99, MO 1.01–1.07. Paraligula bifid, 24–29 Μm long, inner tooth 19–22 Μm long, shorter than outer tooth. Pecten hypopharyngis with 6 teeth almost equal in size.

Body ( Figs 66H–I View FIGURES 66 A – J ). Without lateral fringe. Anterior parapods with simple claws. Procercus 137–165 (4) Μm long, 28–29 Μm wide, with 7 anal setae, 379–448 Μm long. L/ W 4.83 –5.64 (4). Supraanal seta well developed. Anal tubules not measurable. Posterior parapod not measurable; subbasal seta on posterior parapod simple, with 3– 4 small spines basally ( Fig. 66H View FIGURES 66 A – J ); parapod apex with numerous simple claws and one serrated claw; bifid claw with V-shaped lower indentation ( Fig. 66I View FIGURES 66 A – J ). B/C 1.13–1.18 (2).

Remarks. Adult males and immatures of Labrundinia reniformis appear most similar to those of L. parareniformis and differences are discussed under this species. Labrundinia reniformis has been recorded from two localities in São Paulo State, Brazil. The larvae were collected in the Barreiro reservoir, characterized by a predominance of the aquatic macrophyte, Eichhornia azurea . The species was also collected in the Canchin reservoir, a small dam characterized by a predominance of the aquatic macrophyte, Salvinia auriculata .

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

NTNU

National Taiwan Normal University

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Chironomidae

Genus

Labrundinia

Loc

Labrundinia reniformis Silva

Silva, Fabio Laurindo Da, Fonseca-Gessner, Alaide Aparecida & Ekrem, Torbjørn 2014
2014
Loc

Labrundinia

Silva 2013: 600
2013
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