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 Author Sganga, Julieta V. Departamento de Biodiversidad y Biologia Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon II, C 1428 EHA, Buenos Aires, Argentina Author Sganga, Daniela E. National Institute of Aquatic Resources, Technical University of Denmark, Kgs. Lyngby, Denmark Author Iglesias, Monica S. https://orcid.org/0000-0002-3294-4730 Departamento de Biodiversidad y Biologia Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon II, C 1428 EHA, Buenos Aires, Argentina iglesias.fcen@gmail.com text ZooKeys 2022 2022-07-11 1111 389 412 http://dx.doi.org/10.3897/zookeys.1111.80961 journal article http://dx.doi.org/10.3897/zookeys.1111.80961 1313-2970-1111-389 B90A7CF73E834006AEAD7932A9F4F28B 60D15EFDBDF45239BE532352F1DF7927 Smicridea (Rhyacophylax) vermiculata Flint, 1978 Figs 1C , 5A-D Smicridea (Rhyacophylax) vermiculata Flint, 1978: 381. Marinoni and de Almeida 2000 : 286 [distribution; biology]. Blahnik et al. 2004 : 4 [distribution]. Paprocki et al. 2004 : 9 [checklist]. Sganga 2006 : 142 [distribution]. Calor 2011: 321 [checklist]. Paprocki and Franca 2014 : 36 [checklist]. Holzenthal and Calor 2017 : 186 [catalog]. Material examined. Argentina • 27 males ; Misiones , Obera , Centro de Investigacion y Refugio de Selva Antonia Ramos , A ° Ramos ; 17 Nov. 2013 ; JV Sganga col.; light trap . Description. Adult male. General coloration of the body brown. Length of forewings 4.5 mm ( n = 22), coloration similar to that of the body, with a distinct transverse, white band subapically. Head (Fig. 1C ). In dorsal view rectangular, transverse. Internal margins of the eyes, in dorsal view, convergent, postgenal areas triangular. Interocular area trapezoidal. Interocular distance 1.85 x shorter than MHW. Coronal suture 1.47 x shorter than IOD. Maximum eye width 4.35 x shorter than MHW. Anterolateral setose warts present, oval, bifid posteriorly, with mesal lobe shorter than the lateral. Posterior setose warts subtriangular, with a digitate mesal lobe. Maxillary palp formula: I-II-IV-III-V. Male genitalia . Anterolateral margin of segment IX rounded, produced. Tergum of segment X triangular in lateral view, dorsal margin straight, ventral slightly rounded, with a subapical lobe, and a sclerotized Y-shaped area directed anteriorly through segment IX (Fig. 5A ); in dorsal view divided mesally into two triangular hemitergites, with apex rounded and bearing a lateral lobe, mesal margins straight, with an anterior notch (Fig. 5B ). Inferior appendages with two articules, basal article slightly widened distally, apical one curved mesad in dorsal view, apex pointed (Fig. 5A, B ). Phallus long, with a tubular phallobase; basal portion broad, forming an angle of ~ 90° with distal part, which is very long and with apex slightly upturned (Fig. 4A ); phallus bears subapically four spines mesoventrally on each side, which are directed posteriorly (Fig. 5A, C, D ). Internal sclerotized section of ejaculatory duct long (~ 1/2 the phallobase length) and bent ventrad anteriorly in lateral view, distal end curved upwards and with a posterior concavity (Fig. 5A, C ); in dorsal view longitudinally divided in two (Fig. 5D ). Endotheca simple. Figure 5. Male genitalia of Smicridea (Rhyacophylax) vermiculata 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. Systematic considerations. This species seems to be related to S. (R.) dentifera Flint, 1983 and S. (R.) unguiculata . The three species have simple ejaculatory ducts and lateroventral spines at the apex of the phallus. The features that allow the differentiation of S. vermiculata are the position of the spines of the phallus (it has 4 mesoventral spines on each side directed posteriorly), the ejaculatory duct that is curved upwards and bears a posterior concavity, and the presence of the apicolateral lobe on tergum X. Distribution. Argentina, Brazil, Paraguay.