Xiphocentron (Antillotrichia) redentor, Vilarino & Cavalcante & Dumas & Nessimian, 2018

Vilarino, Albane, Cavalcante, Bruna Maria Silva, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2018, Four new species of Xiphocentron Brauer, 1870 (Trichoptera: Xiphocentronidae) from the Atlantic Forest, southeastern Brazil, European Journal of Taxonomy 441, pp. 1-16 : 9-12

Xiphocentron (Antillotrichia) redentor sp. nov.

urn:lsid:zoobank.org:act:0D373C30-D012-49BD-867C-53CF480CFBE6

Figs 6–7

Diagnosis

The wing venation of the new species is similar to that of X. tijuca sp. nov., having a peciolate fork II, with the nygma outside the fork. They differ, however, in the morphology of the genitalia. In X. redentor sp. nov., the inferior appendages have a linear row of broad spines, ranging from the basal region to subapically, while in X. tijuca sp. nov. they have only four spines mesally below the mesal sclerite. The preanal appendages are straight subbasaly and not produced as in X. tijuca sp. nov. Moreover, tergum IX in the new species has a produced posterior margin, forming rounded lobes, while in X. tijuca sp. nov. the lobes are very shallow.

Etymology

The specific epithet refers to the Cristo Redentor, an Art Deco statue of Jesus Christ, located at the peak of Corcovado in the Tijuca National Park, overlooking the city of Rio de Janeiro. The statue is listed as one of the New Seven Wonders of the World.

Material examined

Holotype

BRAZIL: Ƌ, Rio de Janeiro State, Rio de Janeiro, Parque Nacional da Tijuca, Gruta Paulo e Virgínia , Rio Archer , 22°57′15.3″ S, 43°17′29.9″ W, alt. 593 m, 11 Nov. 2015, B.M. Silva, L.L. Dumas, J.L. Nessimian and F. Quintarelli leg. ( DZRJ 7336 ).

Paratypes

BRAZIL: 2 ƋƋ, Rio de Janeiro State, Rio de Janeiro, Parque Nacional da Tijuca, Rio Taquaruçú (‘abaixo da cachoeira’ [below the waterfall]), 22°57′36.2″ S, 43°17′36.2″ W, alt. 509 m, 7 Sep. 2016, B.M. Silva, L.L. Dumas, J.L. Nessimian and F. Quintarelli leg. ( DZRJ 7337); 1 Ƌ, same data as for preceding ( MZSP 5413).

Description

Adult

Forewing length 4.0 mm (n = 4). Overall color (in alcohol) nearly uniformly medium brown. Tibial spur formula 2-4-3. Hind tibia apical spurs not modified ( Fig. 6A ). Forewings covered with uniformly fine, brown setae, with opaque region on anterior margin between Sc and R1. Wing venation ( Fig. 6B ). Forewings: forks II and IV present; Sc reaching C; fork II petiolated, nygma outside fork; thyridial cell closed; two anal veins present. Hind wings: forks II and V present; Rs with three branches R2+3, R4 and R5; R1 absent. Abdominal sternum V bearing pair of mammiform glandular regions.

Male genitalia ( Fig. 7 A–E)

Tergum IX, in lateral view ( Fig. 7A ), ventrally broader, anteroventral margin rounded, posterior margin, ventral region roundly produced, dorsal region produced posterad; in dorsal view ( Fig. 7B ), anterior margin presenting deep V-shaped central incision, posterior margin projected with small U-shaped central incision forming rounded lobes; posterolateral margins projected rounded. Sternum IX, in lateral view ( Fig. 7A ), with dorsal margin almost straight, anterior margin with medial apodeme, ventrally straight without acute indentation, ventral margin rounded, posterior margin rounded; apodeme apically acuminate; in ventral view ( Fig. 7C ), posterior margin with shallow medial concavity, anterior margin straight, lateral apodemes half as long as sternum IX, tapered apically.

Segment X semi-membranous; in lateral view ( Fig. 7A ), elongated, apicodorsally rounded, apicoventrally produced; in dorsal view ( Fig. 7B ), wider basally, closed all over its length, apex split into two small rounded lobes; in ventral view ( Fig. 7C ), truncate apically, ventral region of segment triangular, cleft apically.

Preanal appendages elongated, about twice as long as segment X and setose; in lateral view ( Fig. 7A ), basally directed posterodorsally, then bent posterad, constricted at mid-length, apex rounded; in dorsal view ( Fig. 7B ), narrower at base and sinuous, enlarged subapically, apex rounded, slightly rugous. Inferior appendages with articles completely fused; basal region, in lateral view ( Fig. 7A ), broad, posteroventral margin crenated, not produced; apical region slightly longer than basal region, slender, in dorsal view ( Fig. 7B ), with apex strongly enlarged; inner face with row of seven broad spines, ranging from basal region to subapical region; mesal sclerite small, bearing two or three points at apex.

Phallus tubular, long and slender; in lateral view ( Fig. 7D ), apex length about three times as long as base; in dorsal view ( Fig. 7E ), apex not enlarged, semi-membranous.

Figures

Fig. 6. Xiphocentron (Antillotrichia) redentor sp. nov., holotype, adult, Ƌ. A. Tibial spurs of the hind leg. B. Right wings, dorsal view. Scale bar = 0.5 mm.

Fig. 7. Xiphocentron (Antillotrichia) redentor sp. nov., holotype, adult, Ƌ, genitalia. A. Left lateral view. B. Dorsal view. C. Ventral view. D. Phallus apex, left lateral view. E. Phallus, apex in dorsal view. Scale bar = 0.1 mm.