Claudiotendipes, Andersen & Mendes & Pinho, 2017

Andersen, Trond, Mendes, Humberto Fonseca & Pinho, Luiz Carlos, 2017, TWO NEW NEOTROPICAL CHIRONOMINAE GENERA (DIPTERA: CHIRONOMIDAE) Abstract, CHIRONOMUS Journal of Chironomidae Research 30 (30), pp. 26-54 : 32-33

Claudiotendipes new genus

http://zoobank.org/ 4377891C-B29C-4CB5-8171- 180517119AA4

Type species: Claudiotendipes froehlichi n. sp.

Other included species: Claudiotendipes epleri n. sp.

Etymology: Named in honor of Professor Dr. Claudio G. Froehlich for his many important contributions to aquatic entomology and for initiating, with all his kindness and knowledge, the formation of many Brazilian research groups in ecology and systematics of aquatic insects. The suffix -tendipes, is a common ending among Chironominae genera. For the purposes of nomenclature, the gender of the genus name is masculine.

Diagnostic characters: The males can be separated from all other Chironomini by the combination of an antenna with 13 segments, antennal ratio 0.3–1.1; squama bare; wings lacking markings; fore tibia with weakly developed, shallow scale without spur; mid- and hind tibiae with short, fused combs, with single spur; anal tergite bands separate; setae on tergite IX restricted to posterior margin; anal point long, parallel-sided to weakly spatulate; superior volsella digitiform without basomedial group of setae; median volsella reduced to single setae; and inferior volsella apically forked.

The pupa can be separated from all other Chironomini except Paratendipes by the combination of a thoracic horn with few branches; cephalic tubercles and frontal setae present; tergites II–VI with anterior bands of weak shagreen; large pedes spurii B on segment II; segment II with 2–3 non-taeniate L setae, segments III–IV each with 3 non-taeniate L setae; and anal lobe with fringe and dorsal seta. It can be separated from Paratendipes by the bare conjunctive III/IV.

The larva can be separated from all other Chironomini except Omisus and Paratendipes by the combination of a plumose S I; mentum with four pale median teeth, the inner pair of which are smaller and shorter; and antenna with 6 segments and alternate Lauterborn organs. It can be separated readily from Omisus and Paratendipes by the presence of 3 inner teeth on the mandible; the shape of the ventromental plates; and the simple pecten epipharyngis with about 12 teeth.

Generic description

Male. Small to medium sized species, with wing length 1.0–2.0 mm.

Coloration. Whitish to pale yellowish, wing translucent without dark markings.

Antenna. With 13 flagellomeres. AR 0.28–1.13.

Head. Eyes bare, with well-developed dorsomedial extension containing either 5 or 6 ommatidia in each lateral facet diagonal. Frontal tubercle absent. Temporal setae 9–13, uniserial, composed of 3–5 strong inner verticals, 2–4 weak outer verticals and 2–4 weak postorbitals. Clypeus with 8–14 strong setae. Palp with 5 segments, not shortened; third palpomere with 2–6 sensilla subapically, sometimes grouped in pit, longest 11–20 µm long.

Thorax. Antepronotal lobes separated medially; each lobe narrowing dorsally, with 0–1 lateral seta. Scutum overreaching antepronotum, tubercle absent. Acrostichals 6–13, all decumbent, starting close to antepronotum. Dorsocentrals 7–15, uniserial; prealars 2–3; supraalars absent. Scutellum with 5–9 setae, uni- to partly biserial.

Wing. VR 1.16–1.26. Wing membrane bare, with fine punctation. Anal lobe absent to weakly developed. Costa not extended, reaching wing tip; R 2+3 ending close to apex of R 1; FCu distal to RM. Brachiolum, R, R 1 and R 4+5 with setae, remaining veins bare. Squama bare.

Legs. Fore tibia with weakly developed, shallow scale without spur. Mid and hind tibiae with short, fused combs, with single spur per tibia. Pseudospurs and sensilla chaetica absent. Pulvilli vestigial. LR 1 1.33–1.46.

Abdomen. Tergites and sternites with sparse, irregular setation. Segment VIII subtriangular, tapering anteriorly.

Hypopygium. Anal tergite bands separate, ending slightly above or reaching base of anal point. Tergite IX in dorsal view ( Figs 3F , 6F ) with posterior margin subtriangular, with few marginal setae to each side of anal point only. Anal point parallel-sided to weakly spatulate, one-third to one-fourth the length of gonostylus, with microtrichia at base only. Laterosternite IX without or at most with three setae. Transverse sternapodeme well developed, nearly straight, with slightly higher lateral corners. Phallapodeme narrow. Superior volsella without setose base, curved to nearly straight, tapering towards apex, without microtrichia, with two dorsal-lateral and two distal-medial setae. Median volsella possibly represented by one to two setae on single, small protuberance. Inferior volsella apically foot-shaped, with microtrichia, with 5–7 simple setae on main branch and 3–5 simple or apically split setae on side branch. Gonostylus well developed, with simple setae along inner margin, and with or without apical field of elongate trichia along inner margin. HR 0.85–1.13.

Female. Unknown.

Pupa and larva. See description under C. froehlichi .

Remarks

Larvae of Claudiotendipes n. gen. have been recorded repeatedly in studies of Brazilian lotic systems as morphotypes unassigned to genus, provisionally named “aff. Omisus ” ( Sanseverino and Nessimian 1998; Suriano and Fonseca-Gessner 2004; Henriques-Oliveira et al. 2003 a, 2003b), “cf. Omisus ” ( Henriques-Oliveira et al. 1998), “cf. Paratendipes ” ( Sanseverino and Nessimian 2008) or “prox. Paratendipes ” ( Trivinho-Strixino 2011). However, such overall resemblance to Omisus and Paratendipes does not reflect close phylogenetic relationship ( Fig. 2 ).

Key to males in Claudiotendipes n. gen.

1. Anal point weakly spatulate, wing length about 1.7 mm, AR = 1.0. Bahia, Rio de Janeiro, São Paulo, and Santa Catarina States, Brazil. ……….....................………… C. froehlichi n. sp.

– Anal point parallel-sided, wing length about 1.0 mm, AR = 0.28. Guanacaste Province, Costa Rica …………....................…………. C. epleri n. sp.

Figures

Figure 3. Claudiotendipes froehlichi n. sp., male.A, Head. B, Tentorium, stipes and cibarial pump. C, Thorax. D, Apex of fore tibia. E, Wing. F, Hypopygium, dorsal view. G, Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.

Figure 6. Claudiotendipes epleri n. sp., male. A, Head. B, Tentorium, stipes and cibarial pump. C, Thorax. D, Apex of fore tibia. E, Wing. F, Hypopygium, dorsal view. G, Hypopygium with anal point and tergite IX removed, dorsal aspect to the left and ventral aspect to the right.

Figure2.Cladogram obtainedfromdata matrix performing search usingimplied weightingof characters (k= 15.263673).