Smicridea (Rhyacophylax) boraceia, Santana & Desiderio & Hamada, 2021

Santana, Vitória, Desiderio, Gleison Robson & Hamada, Neusa, 2021, Two new species of Smicridea (Rhyacophylax) Müller 1879 (Trichoptera Hydropsychidae) from Atlantic Forest, Brazil, Zootaxa 4941 (1), pp. 115-126 : 117-120

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Smicridea (Rhyacophylax) boraceia

sp. nov.

Smicridea (Rhyacophylax) boraceia   sp. nov. Santana, Desiderio & Hamada

Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3

Diagnosis. Smicridea (Rhyacophylax) boraceia   sp. nov. is most similar to S. (Rhyacophylax) scalprum Vilarino, Dias & Calor 2019   by having tergum X concave at its apex in dorsal view, with lateral margins rounded forming a produced flap, strongly sclerotized, and with the apex of the phallotremal sclerite of the phallic apparatus with subtriangular lateral flap. However, S. (R.) boraceia   sp. nov. has six short, stout spines on the ventral region of the apicomesal lobe of tergum X, which are absent in S. (R.) scalprum   . In addition, S. (R.) boraceia   sp. nov. can be recognized by the two medium-sized, apicolateral spines directed posterad and generally three apicoventral spines directed downward on the phallic apparatus (both absent in S. (R.) scalprum   ). Additionally, the new species has a pair of subapical, comma-shaped sclerites on the phallotremal sclerite of the phallic apparatus, in dorsal view.

Description. Adult male. Length of each forewing 7.95–8.16 mm (mean = 8.05, SD = ±0.27, n = 5). General color dark brown (in alcohol) ( Fig. 1A View FIGURE 1 ). Antennae pale brown ( Figs 1 View FIGURE 1 A–1C). Head dark brown, dorsal region with: brown setae ( Fig. 1C View FIGURE 1 ); well-pronounced coronal suture; five setal warts, with anteromesal wart small, rounded, anterolateral pair partially divided, weakly delimited, and posterolateral pair large, ovoid ( Fig. 1C View FIGURE 1 ). Width of one eye, in dorsal view, 1/3 that of interocular distance ( Fig. 1C View FIGURE 1 ). Maxillary palp with segment 3 about 2X longer than either of segments 1 or 2 and about same length as segment 4, segment 5 about 1.2X as long as all previous segments combined ( Fig. 1B View FIGURE 1 ). Thorax dark brown, covered with brown setae ( Fig. 1A View FIGURE 1 ); legs brown, with fore- and mid-leg tarsi yellowish ( Fig. 1A View FIGURE 1 ). Wing venation typical for subgenus ( Figs 1D, 1E View FIGURE 1 ). Forewings, in alcohol, dark brown, with three white transverse bands zigzaging over full length, one subapical band arising on costa, running through half length of R2 and ending at Cu1b; mesal band arising on costa, running through base of R2+3 and ending on apex of Cu2, and basal band arising on subcosta and reaching anal vein ( Fig. 1D View FIGURE 1 ). Sternum V with pair of anterolateral glandular processes 1.2X longer than sternum. Abdominal segments VI and VII without internal glands ( Fig. 1F View FIGURE 1 ).

Male genitalia. Segment IX in lateral view with anterolateral margins sinuous, concave at mid-height, weakly sclerotized ( Fig. 2A View FIGURE 2 ); posterodorsal margins produced, rounded, bearing small spicules ( Figs 2A, B View FIGURE 2 ). Tergum X elongate; in lateral view, ventrolateral margins strongly sclerotized, without processes; each with apex ending in rounded lobe, with shallow subapicoventral notch, ( Fig. 2A View FIGURE 2 ); in dorsal view, lateral margins rounded, each produced as flap; dorsomesal setose area bearing seven to eight pairs of medium-sized, fine setae; apex divided mesally into pair of hemitergites by parallel-sided incision about 1/2 length of tergite ( Fig. 2B View FIGURE 2 ); apex of each hemitergite concave, with one pair of short, stout apicolateral spines, apicomesal lobe strong, rounded, bearing about six short, stout spines ventrally ( Figs 2B, 2C View FIGURE 2 ). Inferior appendages each 2-segmented; basal segment as long as tergum X, slightly inflated distally, covered with medium-sized to long, fine setae, with four long, stout spine-like setae subapically, two dorsal and two on internal margin; apical segment about 1/2 as long as basal segment, thick, covered with medium-sized, fine setae, curved mesad, apex slightly pointed ( Fig. 2B View FIGURE 2 ). Phallic apparatus long and tubular; basal section, in lateral view, enlarged, 3X diameter of phallotheca at its narrowest portion, forming angle of about 63° with apical section; median section of phallotheca strongly curved ventrad, without processes ( Fig. 2D View FIGURE 2 ); apex, in dorsal view, slightly enlarged, without processes or plates; endothecal membranes, in dorsal view, with two medium-sized, dorsolateral spines, directed posterad ( Fig. 2F View FIGURE 2 ); in lateral view, with three medium-sized, apicoventral spines directed downward ( Fig. 2E View FIGURE 2 ) (variation: male paratype INPA-TRI 000100 has only two spines ( Fig. 2G View FIGURE 2 ); male paratype INPA-TRI 000101 also has two spines, one them minute in size ( Fig. 2H View FIGURE 2 )); phallotremal sclerite, in dorsal view, distinct, strongly sclerotized, slightly divided distally into two slender, paired lobes with rounded apices, each lobe bearing one small subtriangular lateral, flap ( Fig. 2F View FIGURE 2 ), accompanied basally with pair of very dark, subapical, comma-shaped sclerites; in lateral view, slender, slightly upturned apically ( Fig. 2D View FIGURE 2 ). Ejaculatory duct of endophallus, in lateral view, distinct, sclerotized. Endothecal membranes distinctly reticulated ( Fig. 2E View FIGURE 2 ), dorsolateral spines upturned when phallic apparatus everted ( Fig. 2H View FIGURE 2 ).

Female and immature stages. Unknown.

Material examined. Holotype male. BRAZIL: São Paulo: Salesópolis, Estaç „o Biológica de Boracéia , Casa Grande , 15.xi.1974, C.G. Froehlich leg., ( MZUSP 000351 View Materials ).  

Paratypes: same data as holotype, 15 males ( MZUSP)   ; same data, except Rio Claro , represa Casa Grande, 23º38’10.3”S, 45º49’57.1”W, 856 m a.s.l., 5 males, 23.i.2011 GoogleMaps   , L.L. Dumas & D.M. Takiya legs., (INPA-TRI 000100–104); same data, except 10 males ( DZRJ) GoogleMaps   ; same data, except 4 males ( DZUP) GoogleMaps   .

Distribution. BRAZIL (Atlantic Forest: S„o Paulo state) ( Fig. 3 View FIGURE 3 ).

Etymology. The specific epithet refers to Estaç„o Biológica de Boracéia where the specimens were collected. The name is a substantive in apposition, with unchanging gender.


Museu de Zoologia da Universidade de Sao Paulo


Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure