Labrundinia amandae 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 : 10-16

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.5621027
persistent identifier	https://treatment.plazi.org/id/676987A8-B70B-FFDE-FF29-FB11FBA5FD0E
treatment provided by	Plazi
scientific name	Labrundinia amandae Silva
status	sp. nov.

Treatment

Labrundinia amandae Silva View in CoL sp. n.

( Figs 1–3 View FIGURES 1 A – M View FIGURES 2 A – E View FIGURES 3 A – I )

Labrundinia View in CoL sp. 10 Silva et al. 2013: 601 (DNA barcodes).

Material examined. Type material: Holotype male with pupal and larval exuviae, Brazil: São Paulo, São Carlos, Ecological Park, 19.iv.2010, F. L. Silva ( MZUSP). 5 Paratypes: 1 male with pupal and larval exuviae same data as holotype ( NTNU); 1 male with pupal and larval exuviae same data as holotype except for Canchin reservoir, 25.vii.2007 ( NTNU); 1 female with pupal and larval exuviae same data as holotype except for Monjolinho stream, 11.iv.2011 ( NTNU); 2 pupa with larval exuviae same data as holotype ( NTNU).

Etymology. Named in honour of Amanda Carvalho de Andrade from Rio de Janeiro, in recognition for her friendship, kindness and continuous support.

Diagnostic characters. Labrundinia amandae sp. n. differs from other Labrundinia species by the combination of the following characters. Adult male: tentorium 149–192 Μm long; abdomen including hypopygium completely brown; sternapodeme with reduced anterior process. Pupa: thoracic horn semi-globose, preapical indentation moderately deep; abdominal segment VII with 4 LS-setae; male genital sac extending much beyond apex of anal lobe. Larva: surface smooth with small, dark brown spots ventrally, lateroventral and posteroventral spine groups absent; paraligula multi-toothed, with 4 teeth; subbasal seta of posterior parapod simple; bifid claw with V-shaped lower indentation.

Description. Adult male (n = 3)

Size. Total length 2.2–2.5 mm. Wing length 1.2–1.3 mm. Total length/wing length 1.75–2.04. Wing length/ profemur length 2.95–3.01.

Coloration. Head pale brown with dark occipital margin; pedicel and antenna brown; maxillary palp pale brown. Thorax pale brown with dark scutum. Wing membrane transparent without any marking. Legs pale brown. Abdomen including hypopygium brown ( Fig. 1L View FIGURES 1 A – M ).

Head ( Figs 1A–E View FIGURES 1 A – M ). Temporal setae 12, uniserial ( Fig. 1B View FIGURES 1 A – M ). Eye ratio 0.84–0.85 (2). Tentorium ( Fig. 1C View FIGURES 1 A – M ) 149– 192 Μm long. Clypeus 76–87 Μm long, 55–72 Μm wide at largest part, bearing 14–16 setae. Cibarial pump 183–191 Μm long ( Fig. 1D View FIGURES 1 A – M ), with anterior margin concave. Lengths of palpomeres 1–5 (in Μm): 41–45 (2); 47–52 (2); 98– 105 (2); 147–156 (2); 211 (1). Antennal flagellum 790–797 Μm long, diameter of pedicel 125–129 (2) Μm, apical setae single ( Fig. 1E View FIGURES 1 A – M ), AR 1.21–1.29.

Thorax. Antepronotum with 2 (2) lateral setae. Acrostichals 38–55, biserial, diverging evenly posteriorly, starting close to antepronotum and almost reaching scutellum; dorsocentrals 22–26, irregularly uniserial; prealars 8–9; supraalars 2. Anapleural suture ratio 0.48–0.53. Scutellum with transverse row of 10–11 setae and group of numerous fine anterior setae.

Wing ( Fig. 1F View FIGURES 1 A – M ). Width 0.4 mm. Costa 1.1–1.2 mm long. R2+3 absent. VR 0.69–0.76. WW 0.30–0.32. Brachiolum with 2 setae. Squama setiferous.

Legs ( Figs 1G–K View FIGURES 1 A – M ). Fore leg: width at apex of tibia 31–37 Μm ( Fig. 1G View FIGURES 1 A – M ), tibia with single, apical and pectinate spur 18–19 Μm long ( Fig. 1H View FIGURES 1 A – M ), with three lateral teeth and two preapical setae; ta1-4 without any preapical pseudospurs. Mid leg: width at apex of tibia 32–38 Μm long ( Fig. 1I View FIGURES 1 A – M ), tibia with single, apical and pectinate spur 23–30 Μm long with lateral three lateral teeth ( Fig. 1J View FIGURES 1 A – M ) and two preapical setae; ta1-4 each with two preapical pseudospurs. Hind leg: width at apex of tibia 34–42 Μm long ( Fig. 1K View FIGURES 1 A – M ), tibia without spur; comb with 7 bristles; ta1- 4 without any preapical pseudospurs. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 2.

fe ti ta1 ta2 ta3

p1 400–436 385–430 304–340 181–188 128–137 p2 584–616 456–493 480–487 253–275 131–145 p3 526–545 519–561 546–563 252–257 166–168

ta4 ta5 LR BV SV

p1 86–98 56–58 0.75–0.79 2.50–2.51 2.95–3.07 p2 93–100 75–82 0.98–1.07 2.65–2.75 2.13–2.29 p3 109–112 88–91 1.00–1.05 2.57–2.69 1.93–1.97 Hypopygium ( Fig. 1M View FIGURES 1 A – M ). Tergite IX arched, with 8 posterior setae. Membranous anal point small, apical edge rounded. Phallapodeme 58–71 (2) Μm long. Sternapodeme with reduced anterior process. Gonocoxite cylindrical, 143–154 Μm long, 72–75 Μm wide, with slightly concave inner margin. GcR 1.93–2.12. Gonostylus simple and slender, 97–106 Μm long; megaseta 15–16 Μm long. HR 1.46–1.48. HV 2.21–2.40.

Adult female (n = 1)

Size. Total length 1.3 mm. Wing length 0.8 mm. Total length/wing length 1.48. Wing length/ profemur length 2.76.

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. Wing membrane transparent without any marking. Legs pale brown. Abdomen completely dark brown. Seminal capsules brown.

Head. Temporal setae 12, uniserial. Eyes ratio 0.94. Tentorium 149 Μm long. Clypeus 85 Μm long, 61 Μm wide at largest part, bearing 19 setae. Cibarial pump 174 Μm long, as in male. Lengths of palpomeres 1–3 (in Μm): 31; 44; 85. Antennal flagellum 333, AR 0.34 Μm long, diameter of pedicel 51 Μm.

Thorax. Antepronotum with 2 lateral setae. Acrostichals 35, irregularly uniserial, starting close to antepronotum; dorsocentrals 35, irregularly biserial; prealars 15; supraalars 3. Scutellum with transverse row of 10 setae and group of numerous fine anterior setae.

Wing. Width 0.3 mm. Costa 0.8 mm long. R2+3 absent. VR 0.69. WW 0.38. Brachiolum with 2 setae. Squama setiferous.

Legs. Fore leg: width at apex of tibia 36 Μm, tibia with single, apical and pectinate spur 15 Μm, with three lateral teeth and two preapical setae; preapical pseudospurs on ta1-4 not observed. Mid leg: width at apex of tibia 44 Μm long, tibia with two preapical setae, apical spur not observed; preapical pseudospurs on Ta1-4 not observed. Hind leg: width at apex of tibia 41 Μm long, tibia without spur; comb with 7 bristles; preapical pseudospurs on ta1-4 not observed. Claws slender, hooked; pulvilli absent. Lengths and proportion of leg segments as in Table 3.

fe ti ta1 ta2 ta3 p1 315 305 262 128 101 p2 495 369 – – – p3 439 488 – – –

ta4 ta5 LR BV SV p1 63 59 0.86 2.51 2.37 p2 – – – – – p3 – – – – – Genitalia. Gonapophysis VIII broadly rounded, 63 Μm long. Coxosternapodeme 69 Μm long. Postgenital plate rounded. Cerci oval-quadrate, 35 Μm long and 11 Μm wide; with 4 elongated setae. Labia with inconspicuous microtrichia. Notum length 90 Μm long. Seminal capsules oval, 36 Μm long, 28 Μm wide, with conical shaped necks. Length ratio SCa/No 0.40.

Pupa (n = 6 unless otherwise stated)

Size. Abdomen 1.8–2.2 (4) mm long in male, 1.7 (1) mm long in female.

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

Cephalothorax ( Figs 2A–C View FIGURES 2 A – E ). Frontal apotome smooth ( Fig.2A View FIGURES 2 A – E ). Wing sheath smooth 0.7–1.0 mm long. Thoracic horn 203–239 Μm long and 73–87 Μm wide ( Fig. 2B View FIGURES 2 A – E ), THR 2.57–2.81, preapical indentation moderately deep. Membranous preapical papilla 23–43 Μm long ( Fig. 2C View FIGURES 2 A – E ), PTH 0.09–0.17, aeropyle tube simple, short, 18–28 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 8–10 conical tubercles ( Fig. 2B View FIGURES 2 A – E ).

Abdomen ( Figs 2D–E View FIGURES 2 A – E ). Tergite I with scar 114–132 Μm long. T I–VI without shagreen, T VII–VIII with shagreen basal concentrated. Abdominal chaetotaxy as in figure 2D. Abdominal segment VII with 4 LS-setae. A VIII with 5 LS-setae. Anal lobe 263–318 Μm long and 142–185 Μm wide ( Fig. 2E View FIGURES 2 A – E ), outer margins sclerotized, with 8–10 spines, longest spine 10–14 Μm long, inner margins of lobes membranous. ALR 1.48–2.20. Male genital sac extending much beyond apex of anal lobe.

4th instar larva (n = 6 unless otherwise stated)

Coloration. Head pale yellow, with small, dark brown spots ventrally; 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. 3A View FIGURES 3 A – I ). Length 464–514 Μm, 283–317 Μm wide. Surface smooth; lateroventral and posteroventral spine groups absent; IC 0.56–0.67. Ventral cephalic setae S9, S10 and SSm forming a straight line diagonal to longitudinal axis of head capsule ( Fig. 3A View FIGURES 3 A – I ).

Antenna ( Figs 3B–C View FIGURES 3 A – I ). Length 311–348 Μm, A1 219–244 Μm long, with ring organ located 0.86–0.90 (4) from base, A2 83–89 Μm long. AR 2.32–2.45. Blade longer than A2 over-reached by accessory blade.

Maxilla ( Fig. 3D View FIGURES 3 A – I ). Basal palp segment 23–32 Μm long and 7–11 wide at the middle, with ring organ located 0.76–0.84 (5) from base. PR 2.82–3.28. APR 7.31–10.2.

Mandible ( Fig. 3E View FIGURES 3 A – I ). Length 63–86 Μm. Sensillum campaniformium located 0.67–0.75 from apex, basal tooth bifid, with seta subdentalis projecting from sloping end towards apical tooth, accessory tooth present, AMD 2.56– 3.89.

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

Hypopharyngeal complex ( Figs 3F–G View FIGURES 3 A – I ). Ligula 41–58 Μm long, 22–26 Μm wide, with row of 5 teeth. IO 0.92– 0.98, MO 1.00–1.04. Paraligula multi-toothed, with 4 teeth, 19–27 Μm long, inner tooth 13–19 Μm long, shorter than outer tooth. Pecten hypopharyngis with 8 teeth almost equal in size.

Body ( Figs 3H–I View FIGURES 3 A – I ). Without lateral fringe. Anterior parapods with simple claws. Procercus 146–171 (5) Μm long, 20–33 (5) Μm wide, with 7 anal setae, 518–552 (3) Μm long. L/ W 4.47 –7.48 (5). Supraanal seta well developed. Anal tubules not measurable. Posterior parapod 324 (1) Μm long; subbasal seta serrated, with 3–4 (5) spines basally ( Fig. 3H View FIGURES 3 A – I ); parapod apex with numerous simple claws; bifid claw with V-shaped lower indentation ( Fig. 3I View FIGURES 3 A – I ). B/C 1.02 (1).

Remarks. Labrundinia amandae is very similar to L. unicolor in the adult males, but can be separated from the former by the longer tentorium (149–192 Μm in L. amandae vs 90–126 Μm in L. unicolor ). The pupal exuviae are perhaps most similar to those of L. multidentata and L. tenata , but can be distinguished from these species by having 4 LS-setae on the abdominal segment VII. The larvae are apparently most similar to those of L. unicolor , but L. amandae can be separated by having a yellow head with small, dark brown ventral spots. Labrundinia amandae , L. tenata and L. unicolor can also be separated by their partial COI gene sequences ( Silva et al. 2013). Labrundinia amandae has so far been recorded from two localities in São Paulo State, Brazil. The larvae were collected in small dams characterized by a predominance of aquatic macrophytes.