Smicridea (Rhyacophylax) nanda Flint, 1983

Sganga, Julieta V., Sganga, Daniela E. & Iglesias, Monica S., 2022, Review and redescription of species in the brasiliana group of Smicridea (Rhyacophylax) (Trichoptera, Hydropsychidae, Smicrideinae): exploration of the utility of geometric morphometrics as a method for delimitation and characterization of species in the genus, ZooKeys 1111, pp. 389-412 : 389

Smicridea (Rhyacophylax) nanda Flint, 1983

Figs 1E , 7A-D

Smicridea (Rhyacophylax) nanda Flint, 1983:65. Sganga 2006: 142 [distribution]. Holzenthal and Calor 2017: 177 [catalog].

Material examined.

Argentina • 1 male; Misiones, Río Iguazú, camp. Nandu ; 25 Feb. 1973; OS Flint Jr. col.; paratype; USNM .

Description.

Adult male. General coloration of the body light brown. Length of forewings 6.8 mm (n = 1), coloration similar to that of the body, with a soft darkening on the crossveins and a pale, subapical, transverse band.

Head (Fig. 1D ). In dorsal view rectangular. Internal margins of the eyes, in dorsal view, concave, postgenal areas small, triangular. Interocular area trapezoidal. Interocular distance 2.6 × shorter than MHW. Coronal suture 1 × the length of IOD. Eyes slightly produced anteriorly, maximum eye width 3.25 × shorter than MHW. Anterolateral setose warts present, very subtle, oval, bifid posteriorly. Posterior setose warts subtriangular. Maxillary palp formula: I-II-III-IV-V.

Male genitalia. Anterolateral margin of segment IX slightly rounded on the dorsal half (Fig. 7A ). Tergum of segment X subtriangular in lateral view, with rounded apex, dorsal and ventral margins straight, ventral one with a sclerotized H-shaped area directed anteriorly through segment IX; in dorsal view divided mesally into two subtriangular hemitergites with rounded apex and mesal margins straight (Fig. 7B ). Inferior appendages with two articules, curved mesally in dorsal view, basal article slightly widened distally, apical article narrow, short, apex pointed (Fig. 7A, B ). Phallus with long and tubular phallobase; basal portion slightly broad, bending ventrad mesally, distal part straight (Fig. 7A ); basal and dista parts of the phallus forming an angle of ~ 90°; dorsal periphallic cap present at midlength. Sclerotized part of ejaculatory duct curved dorsad at midlength; tip directed upwards in lateral view; with two dorsolateral elongated, oval plates in lateral view and two spine-like sclerites beneath them (Fig. 7A, C, D ). Endotheca wrinkled (Fig. 7D ).

Systematic considerations.

This species seems to be related to S. brasiliana and S. weidneri (see Systematic considerations section for S. brasiliana ). Smicridea nanda is characterized by the ejaculatory duct that is curved dorsad at midlength and distally upturned, and the shape of the two pairs of sclerotized plates: the dorsolateral ones elongated, oval in lateral view and the other two spine-like lying beneath them.

Distribution.

Argentina.

Figures

Figure 1. Heads in dorsal view of the species of the Smicridea brasiliana group A Smicridea (Rhyacophylax) brasiliana B S. (R.) weidneri C S. (R.) vermiculata D S. (R.) atrobasis E S. (R.) nanda. Abbreviations: CSL length of the coronal suture, IOD interocular distance, MEW maximum eye width, MHW maximum head width. Scale bar: 1 mm.

Figure 7. Male genitalia of Smicridea (Rhyacophylax) nanda A segments IX, X, inferior appendages and phallus, lateral view B segments IX, X and inferior appendages, dorsal view C tip of the phallus, lateral view D tip of the phallus, dorsal view.