Smicridea (Rhyacophylax) weidneri Flint, 1972

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) weidneri Flint, 1972

Figs 1B , 4A-D

Smicridea (Rhyacophylax) weidneri Flint, 1972: 238; 1966:8 [as Rhyacophylax brasilianus , distribution]. Marinoni and de Almeida 2000: 286 [distribution; biology]. Paprocki et al. 2004: 9 [checklist]. Sganga 2006: 142 [distribution]. Paprocki and França 2014: 37 [checklist]. Manzo et al. 2014: 166 [distribution]. Holzenthal and Calor 2017: 187 [catalog].

Material examined.

Argentina • 1 male; Misiones, Capiovy ; 5 Apr. 1971; CM & OS Flint Jr. col.; paratype; USNM • 15 males; Misiones, Oberá, Centro de Investigación y Refugio de Selva Antonia Ramos , A ° Ramos ; 17 Nov. 2013; JV Sganga col.; light trap .

Description.

Adult male. Coloration of the body stramineous. Length of the forewings 4.5 mm (n = 16), coloration similar to that of the body, with two transverse, brown bands, one subapical, almost straight and the other sinuous, at midlength.

Head (Fig. 1B ). In dorsal view rectangular, transverse. Mesal margins of the eyes, in dorsal view, concave, postgenal areas small, triangular. Interocular area rectangular, longer than wide. Interocular distance 2.75 × shorter than MHW. Coronal suture 1.08 × longer than IOD. Maximum eye width 3 × shorter than MHW. Anterolateral setose warts present, oval, with a V-shaped notch posteriorly. Posterior setose warts subtriangular. Maxillary palp formula: I-II-IV-III-V.

Male genitalia. Anterolateral margin of segment IX slightly rounded. Tergum of segment X triangular in lateral view, dorsal and ventral margins straight, the ventral one with a sclerotized Y-shaped area directed anteriorly through segment IX (Fig. 4A ); in dorsal view divided mesally into two triangular hemitergites, with apex rounded and mesal margins concave (Fig. 4B ). Inferior appendages with two articles, basal article slightly widened distally, apical one curved mesad in dorsal view, slightly narrowing towards the apex, which is rounded (Fig. 4A, B ). Phallus long, with a tubular phallobase; basal portion broad, forming an angle of ~ 90° with distal part, that is straight and with apex somewhat widened; dorsal periphallic cap present subapically (Fig. 4A ). Internal sclerotized section of ejaculatory duct long and sinuous in lateral view (~ 2/3 the phallobase length), distal end curved upwards (Fig. 4A, C ); in dorsal view longitudinally divided in two, apex spindle-shaped (Fig. 4D ); in lateral view with two romboidal dorsolateral plates in the posterior half of the ejaculatory duct, with ventral and posterior margins serrated and with small spines on its distal surface; dorsal to these plates there are two wide spine-like plates directed posteriorly (Fig. 4A, C, D ). Endotheca simple.

Systematic considerations.

This species seems to be closely related to S. brasiliana and S. nanda (see Systematic considerations section for S. brasiliana ). Smicridea weidneri can be identified by the spindle-shaped distal end of the ejaculatory duct, that is simple in the other two species, and the shape of the two pairs of plates, two rhomboidal, with ventral and posterior margins serrated, and covered with small spines, and two spine-like, wide, directed posteriorly.

Distribution.

Argentina, Brazil.

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 4. Male genitalia of Smicridea (Rhyacophylax) weidneri 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.