Bezzia blantoni Spinelli & Wirth 1989
Creators: name: M, Maria
name: Spinelli, Gustavo R.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Ceratopogonidae
Bezzia
Bezzia blantoni

description: Bezzia blantoni Spinelli & Wirth, 1989
(Figs. 1–29)
Bezzia blantoni Spinelli &Wirth 1989: 771 (male, female, pupa; distribution); Spinelli & Wirth, 1993: 63 (in list Argentinean species); Arnaud & Arnaud, 1996: 17; Borkent & Wirth, 1997: 125 (Catalog World species); Borkent & Spinelli, 2000: 61 (Catalog south USA species); Borkent & Spinelli, 2007: 93 (Neotropical catalog); Borkent, 2009: 157 (online Catalog).
Description of fourth instar larva (Figs. 1–12, 16). Exuviae pale yellowish. Head capsule (Figs. 1–5) elongate; apex slightly bent ventrally, setae minute, poorly visible, chaetotaxy as in Figs. 1–2; HL 0.30 mm (028–0.33, n=2), 0.41 mm (0.38–0.45, n=5); HW 0.126 mm (0.12–0.13; n=2), 0.12 mm (0.11–0.13, n=5); HR 2.62 (2.52–2.73; n=2), 3.36 (3.15–3.46, n=5); SGW 0.082 mm (0.076–0.089; n=2), 0.07 mm (0.07–0.08, n=5); SGR 1.52 (1.47–1.57; n=2), 1.64 (1.57–1.71, n=5). Labrum (Figs. 1, 3–5) longer than wide, not extending beyond hypostoma, with pair anterolateral sensilla styloconica (Fig. 5); palatum (Figs. 4–5) with 3 pairs of closely spaced sensillae, 2 trichoidea, one campaniformia (Fig. 5); palatal bar small, situated immediately posterior to messors; messors (Fig. 5) small, thin, curved, gently sclerotized, situated away from mandibles, 5 small scopae (Figs. 10, 16). Maxilla (Figs. 4–7) with blunt sensillum, maxillary palpus long, cylindrical (Fig. 6–7), with 2–3 subapical papillae; galeolacinia with stout, blunt setae (Figs. 6–7). Mandible (Figs. 4–6, 11) hooked, curved, tooth long, fosa mandibularis on ectal surface; MDL 0.05 mm (0.04–0.06, n=5). Hypostoma (Figs. 5–6) simple, finely toothed. Labium small, triangular. Epipharynx (Fig. 12) less massive, with 2 combs: ventral comb with 4–6 stout, short teeth, apical margin concave; dorsal comb with rather long teeth on posterior edge, auxiliary sclerites located near lateral arms; LAW 0.06 mm (n=3); DCW 0.03 mm (n=2). Hypopharynx (Fig. 10) long, thin, gently sclerotized, arms slender, hypopharingeal fringe (Fig. 10) present. Thoracic pigmentation uniformly pale yellowish. Caudal segment (Figs. 8–9) about 4 times longer than wide, posterior end with 6 pairs of setae, 4 of them long, stout, pale brown, the other 2 thin, short, FIGURES 1–9. Bezzia blantoni, larva; 1, head capsule, ventrolateral view; 2, head capsule, dorsolateral view; 3, head capsule, anterolateral view; 4, head capsule, anterolateral view (palatum anterior); 5, head capsule, frontal view (palatum); 6, mouthpart; 7, maxilla, lateral view; 8, insertion of setae of caudal segment; 9, caudal segment, frontal view. Head capsule chaetotaxy: j, collar pits; m, posterolateral pits; n, anterolateral pit; o, parahypostomal setae; p, posterior perifrontal setae; q, postfrontal setae; s, anterior perifrontal setae; t, prefrontal setae; u, mesolateral setae; v, posterolateral setae; w, anterolateral setae; x, paranntenal setae; y, ventral setae; z, frontal pits; collar (CO); antennae (AN); labrum (LB); hypostoma (HY); mandible (MD); palatum (PL); sensilla trichoidea (ST); sensilla styloconica (SS); sensilla campaniformia (SCa); messors (MS); maxilla (MX); galeolacinia (GL); maxillary palpus (MP); lacinial sclerite 1 (LC1); sensilla basiconica (SB); palatal bar (PB). Larva caudal segment chaetotaxy: “o” outer setae; “i” inner setae; l1 first lateral setae.
FIGURES 10–15. Bezzia blantoni, larva; 10–12. 10, hypopharynx, dorsal view; 11, mandible, lateral view; 12, epipharynx. Pupa, 13–15.13, dorsolateral and anterodorsal tubercles; 14; ventral setae; 15, 4th abdominal segment and details. Auxillary sclerite (AS); dorsal comb (DC); fossa mandibularis (MF); hypopharyngeal fringe (HF); ventral comb (VC); scopae (SC). Head, thoracic and 4th abdominal tubercles pupa: dorsolateral (dl) and anterodorsal (ad) tubercles; ventromedian setae (vm), ventrolateral setae (vl); abdominal tubercles: lateral anterosubmarginal tubercle (lasm); dorsal posteromarginal tubercle (dpm); dorsal anterosubmarginal tubercle (dasm); ventral posteromarginal tubercle (vpm); lateral posteromarginal tubercle (lpm); prothoracic respiratory horn (PRH); pedicel (P). Scales: 0.05 mm.
FIGURES 21–29. Bezzia blantoni, pupa; 21, entire pupa, dorsal view; 22, prothoracic respiratory horn; 23, prothoracic respiratory horn, anteroventral view; 24, head, dorsolateral view operculum; 25, dorsolateral tubercle detail; 26, dorsal tubercles; 27, 4th abdominal segment, ventral view; 28, 4th abdominal segment, lateroventral view; 29, female, caudal segment, ventral view. Anteromarginal tubercle (am); caudal segment (CS); dorsal tubercles (d); dorsolateral tubercles (dl); posterolateral proceses (PP); prothoracic respiratory horn (PRH); pedicel (P); basal sensillum (bs); operculum (O); spiracle (sp); lateral anterosubmarginal tubercle (lasm) and lateral posteromarginal tubercle (lpm); ventral posteromarginal tubercle (vpm).
brown; CSL 0.69 mm (0.62–0.73, n=4), CSW 0.12 mm (0.09–0.18, n=4), CSR 6.01 (4.00–7.10, n=4), OD 0.04 (0.03–0.06, n=5), OL 0.546 mm (0.53–0.55 mm; n=2), 0.60mm (0.57–0.66, n=4), OLODR 15.7 (10.00– 22.00, n=4).
Description of pupa (Figs. 13–15, 17–29) Length with SEM 3.35 mm. Exuviae brownish. Cephalothorax length 1.29 mm, width 0.60 mm. Operculum (Figs. 17, 21, 24) anterior margin rounded, grooved midway on lateral margins, midportion spiculate, with 3 pairs of tubercles: anteromarginal tubercle (am) with one single, thin, medium-sized seta, basal sensillum (bs) present; remaining two without setae; OL 0.12 mm (n=3), OW 0.24 mm (0.23–0.25, n=3), OW/OL 2.02 (1.91–2.08, n=3), anterior margin rounded, grooved midway on lateral margins, midportion spiculate, with 3 pairs of tubercles: anteromarginal tubercle (am) with one single, thin, medium-sized seta, basal sensillum (bs) present; remaining two without setae. Ventral setae (Figs. 14, 19–20) in tubercles with base rounded: 2 thin, medium-sized ventrolateral setae (vl), 2 stout, long ventromedian setae (vm). Abdominal segments with scattered small spinules. Thoracic tubercles and sensilla as follows: anterodorsal tubercle (ad) with one short, stout seta, base rounded (Fig.18); dorsolateral tubercle (dl) with 2 long, thin setae, one long, one medium-sized (Figs. 13, 21, 25); 5 rounded dorsal tubercles (Figs. 21, 26), as follows: i–iv with stout, subequal, long, thin setae, v pore. Prothoracic respiratory horn (Figs. 13, 21, 22–23) PRH 0.31 mm (n=1), 0.31 mm (0.26–0.35, n=3); 4.7–5.0 times longer than wide, surface smooth, apex curved, with convoluted row of 40–50 apical spiracles (Figs. 22–23); pedicel stout, short, P 0.019 mm (n=1), 0.03 mm (0.02–0.04, n=3); P/PRH 0.06 (n=1), 0.09 (0.07–0.11, n=3) (Figs. 13, 22). Abdominal segments with scattered small spinules. Fourth abdominal segment (Figs. 15, 27–28) with 2 dorsal anterosubmarginal tubercles (dasm): i–ii base cylindrical, with medium-sized, thin seta; 3 dorsal posteromarginal tubercles (dpm): i base triangular, with 2 long, stout setae, ii pore, iii base rounded, seta minute; 2 ventral posteromarginal tubercles (vpm): i base small, short seta, ii triangular, base rounded, with 2 thin setae longer than i; 2 lateral posteromarginal tubercles (lpm), both triangular, base flattened, i with medium-sized, stout seta, ii with 2 long setae, one stout, other thin; one lateral anterosubmarginal tubercle (lasm) with base rounded, small, one long, thin seta. Caudal segment (Figs. 21, 29) 2.83 times longer than wide, dorsal surface with abundant posteriorly directed spinules; posterolateral processes slightly curved mesad in posterior end, with strong tubercles; posterolateral processes length 0.263 mm (0.25–0.27, n=3). Male CSL 0.43 mm (0.41–0.45, n=3), CSW 0.15 mm (0.14–0.16, n=3). Female CSL 0.044 mm (n=1), 0.41 mm (n=1); CSW 0.13 mm (n=1), 0.15 mm (n=1).
Distribution: Belize, Honduras, Costa Rica, Puerto Rico, Argentina (Buenos Aires and Corrientes provinces).
Specimens examined. Argentina, Buenos Aires prov., isla Martín García, Arenal Chico, 20.vii.2006, M. Ronderos – F. Díaz col., 4 larvae, 2 pupae; same data except 14.ix.2006, 1 pupa, same data except 11.x.2006, 1 larva, 1 pupa.
For SEM: same data, 3 larvae, 1 female pupa.
Physicochemical variables of the water in the pond: temperature: 21.25 (16.0–23.6 °C); conductivity: 19 µs; total disolved solids (TSD): 13 mg /l; PH: 5.59 (5.54–5.68)
description: Published as part of M, Maria & Spinelli, Gustavo R., 2009, Description of the immatures of the predaceous midge Bezzia blantoni Spinelli & Wirth (Diptera: Ceratopogonidae), pp. 46-54 in Zootaxa 2295 on pages 47-52, DOI: 10.5281/zenodo.191573