Helicopsyche turbida Navás

Rueda Martín, Paola A. & Miranda, Águeda Verónica Isa, 2015, Association of immature stages of some caddisfly species from northwestern Argentina with description of a new species of Helicopsyche (Trichoptera: Helicopsychidae), Zootaxa 3949 (2), pp. 203-216 : 208-211

Helicopsyche turbida Navás

(Figs 4–6)

Helicopsyche turbida Navás 1923: 200 [Type locality: Argentina, Alta Gracia; MZBS; female]. Schmid 1949: 419 [male, female; redescription]. Flint 1967 [as synonym of H. muelleri ]; 1982 [as valid species].

FIGURE. 4. Helicopsyche turbida Navás 1923 , adult male: 4A, habitus, left lateral; 4B, genitalia, left lateral; 4C, genitalia, dorsal.; 4D, inferior appendages, ventral; 4E, phallic apparatus, left lateral. ix=segment IX; x=segment X; ap=preanal appendages; ai=inferior appendages.

The female of this species was described by Navás (1923). The redescription made by Schmid (1949) does not include characters of the male phallic apparatus. Flint (1967) considered this species as a synonym of H. muelleri , a species that is also recorded for the study area, but later the same author ( Flint 1982) separated the species again.

Helicopsyche turbida is recognizable by the basomesal lobe of the inferior appendage which is round and fused with the internal margin of the inferior appendage, whereas in H. muelleri the lobe is longer and is not fused with the internal margin of the inferior appendage.

Adult (Fig.4). Mean length of each forewing: 6.5 mm (6–7, n=12).

Maxillary palps each two-segmented in male and female. Generally light brown with yellowish spots on legs. Abdominal sternites III–IV with reticulate pattern (Fig. 4A). Lobe of sternite VI absent.

Male genitalia (Fig. 4). Segment IX annular, with posterior margin slightly sinuous; anterior margin broadened medially in lateral view (Fig. 4B: ix). Tergum X with apex slightly broadened and round in lateral view (Fig. 4B: x); with short subapicolateral spines and long subapicodorsal setae and with shallow U–shaped apical excision and Y–shaped re-inforcing sclerotization in dorsal view (Fig. 4C). Preanal appendages small and round (Fig. 4B: ap). Inferior appendages large, apicodorsally broadened with serrate posteroventral margin bearing setae in lateral view (Fig. 4B: ai). In ventral view (Fig. 4D), inferior appendages curved, each with internal margin concave, basal process round and bearing short and strong spines, apex curved mesad and blunt. Phallic apparatus slightly curved, with dorsal apex membranous and internal sclerite oval (Fig. 4E).

FIGURE. 5. Helicopsyche turbida Navás 1923 , larva: 5A, head, dorsal.; 5B, head, ventral; 5C, labrum, dorsal; 5D, mandibles, ventral; 5E, pronotum, dorsal; 5F, mesonotum, dorsal; 5G, metanotum, dorsal; 5H, right foreleg, right posterolateral; 5I, right midleg, right posterolateral; 5J, right hind leg, right posterolateral.

5th instar larva (Figs. 5–6). Mean total length: 8.0 mm (7.9–8.1, n=10). Head round in dorsal view with frontoclypeus and adjoining parietal areas nearly flat and margined with semicircular carina (Fig. 5A). Head generally light brown with pale spots on anterior area of frontoclypeus, around stemmata, and around frontoclypeal excision; posterior area of frontoclypeus and lateral sclerites of head with light brown muscle scars (Fig. 5A). Head in ventral view (Fig. 5B) lighter than dorsal area, bearing brown muscle scars (Fig. 5B). Mandibles as in Fig. 5D. Labrum translucent, with many short setae on anterior margin and 6 longer setae on mesodorsal area (Fig. 5C). Pronotum light brown with dark muscle scars and postero–internal angles uncolored; spines of anterior margin yellowish; bearing scarce short setae on anterior area of each pronotal plate (Fig. 5E). Mesonotum lighter than pronotum with muscle scars in various brown shades; posterior margins angulate (Fig. 5F). Metanotum with 2 pairs of sclerites, anteromesal one (sa 1) subtriangular and not subdivided, and posterolateral sclerite (fused sa 2 and sa 3 sclerites) irregular and larger than anteromesal one (Fig. 5G). Thoracic legs with chaetotaxy as in Figs 5H–J. Anal prolegs each with lateral sclerite curved; anal claw elongate with accessory parallel teeth pectinate, arranged as comb; basal tooth bigger than apical ones ( Fig. 6 A).

Larval case. Mean anterior diameter: 5.0 mm (n=10). Similar that of H. obscura sp. nov.

Pupa ( Fig. 6 ). Mean body length: 5.0 mm (4.9–5.1, n=10). Generally light brown. Mandibles with wide bases, each twice as long as basal width, with internal margin serrate ( Fig. 6 B). Abdominal tergites II–V each with pair of anterior dorsal hook plates; tergite IV with paired anterior and posterior hook plates. Hook plates of abdominal segment II asymmetrical. Detail of dorsal hook plates in Fig. 6 C. Terminal segment bearing two divergent, digitate processes with wide bases, each process bearing 1 subapical and 3 apical setae ( Fig. 6 D).

Biological notes. The larvae of H. turbida were collected in environments similar to those of H. obscura sp. nov. The adults were collected during the day, especially at midday when the sun was high.

Distribution. Argentina.

Material examined. Male Holotype: ARGENTINA: Catamarca: Arroyo El Pintado, Cerca de La Viña, 18.x.1973, O. S. Flint Jr. col., 1 male ( NMNH). Cordoba: Alta Gracia, Sierras de Córdoba, 28.i.1927, C. Briuch col., 1 male ( NMNH). Salta: Metán, Río Las Conchas, 2528'05''S, 06503'00'' W, 935 m, 9.xi.2005, Molineri col., 1 male (IBN). Tucumán: Río La Hoyada (Garabatal), 2642'04''S, 06531'29''W, 1270 m, 12.ix.2006. E. Domínguez et al. cols., 1 male (IBN); Río Grande, 20.x.05, 15 males (IBN); Río San Javier, 21.iv.2004, Rueda Martín col., 2 males, 9 larvae (IBN); Río Los Noques, 21.iv.2009, Rueda Martín col., 2 male metamorphotypes, 29 larvae, 24 pupae (IBN).

Compared material. H. muelleri : BRASIL: Santa Catarina: N 18, F. Müller col., 1 male ( NMNH).

Figures

FIGURE 6. Helicopsyche turbida Navás 1923: 6 A, larval right anal proleg, right lateral. 6 B – D, pupa: 6 B, mandibles, ventral; 6 C, abdominal segments I – V, dorsal, with details of dorsal hook plates; 6 D, terminal abdominal segment, dorsal. 2 a – 5 a = one each of paired anterior dorsal hook plates of abdominal segments II – V; 4 p = one posterior dorsal hook plate of abdominal segment IV.