Xiphocentron (Antillotrichia) matsigenka, Vilarino & Salles & Bispo, 2023

Vilarino, Albane, Salles, Frederico F. & Bispo, Pitágoras C., 2023, Xiphocentronidae (Trichoptera: Psychomyioidea) from the Andean foothills: first species of Machairocentron and Xiphocentron described in the Peruvian Amazon, European Journal of Taxonomy 860, pp. 62-80 : 73-74

Xiphocentron (Antillotrichia) matsigenka sp. nov.

urn:lsid:zoobank.org:act:4CF69FFC-1792-49B6-B47F-3916DD05F030

Figs 1 , 7

Diagnosis

Xiphocentron matsigenka sp. nov. is similar to X. cuyensis Flint, 1983 and X. caenina Schmid, 1982 by the inner face ornamentation of the inferior appendage. The new species can be distinguished by: a) the preanal appendage wider and straight (narrow and bent in X. cuyensis and X. caenina ), in lateral view ( Fig. 7A ); b) the paraproct shape apicodorsally, rounded with narrow ventral lobe (truncate in X. cuyensis and X. caenina ), in lateral view ( Fig. 7A ); and c) the posterior margin of tergum IX with longer lobes and deeper mesal incision in dorsal view (lobes shorter with shallower incision in X. cuyensis and X. caenina ) ( Fig. 7B ).

Etymology

Named after the Matsigenka, an indigenous people belonging to the Arawak linguistic family, who lives in the Amazon Basin jungle regions of southeastern Peru, east of Machu Picchu.

Material examined

Holotype PERU • ♂; Cusco: La Convención Echarate , Cashiriari-2 , Shell prospecting and development project; 11.86425° S, 72.77933° W; elev. 579 m; 6 Apr. 1997; Córdova leg.; MUSM- ENT-0320566 .

Description of male

BODY. Forewing length 3.6 mm (n =1). Color overall pale brown (in alcohol). Maxillary palp segment length formula (I =II =III) <IV<V. Tibial spur formula 2:4:3; spurs unmodified. Venation: forewing forks II and IV present; fork II petiolate at discoidal cell; discoidal cell twice as long as thyridial cell. Hindwing forks II and V present. Sternum V with flat anterolateral region reticulated.

GENITALIA ( Fig. 7 ). Tergum IX, in lateral view, wider basally, narrower apically, about as long as high ( Fig. 7A ); in dorsal view, anterior margin concave, with U-shaped mesal incision; posterior margin with subdeltoid lobe, with rounded apex and deep narrow mesal incision ( Fig. 7B ). Sternum IX, in lateral view, about 2× as long as high, apex subangular; anterior apodeme narrow, straight, with slender flange along anterior margin ( Fig. 7A ); in ventral view, posterior margin with shallow rectangular mesal incision ( Fig. 7C ). Paraproct, in lateral view, oblong, apically rounded, with narrow ventral lobe ( Fig. 7A ); in dorsal view, each side fused, with sclerotized band on fusion region ( Fig. 7B ); wide basally, divided apicomesally until sclerotized band, with numerous sensillae on semi-membranous apex ( Fig. 7B ). Preanal appendage about 3 × as long as tergum IX, setose; in lateral view, wide, straight and enlarged at basal ⅓ ( Fig. 7A ); in dorsal view, about same width throughout length ( Fig. 7B ). Inferior appendage about 2 × as long as tergum IX, setose; coxopodite and harpago completely fused; basal region wide, with short, weakly sclerotized tubercle-like spines; apical region slender, digitate ( Fig. 7A–C ); in lateral view, slightly longer than basal region, inner face with stout spines, sparsely distributed at midlength, anterodorsal spines distinctly longer; mesal sclerite absent ( Fig. 7A ). Phallus tubular, very long and slender, reaching segment V; basally conical, subapically annulate, weakly sclerotized; apex slightly enlarged ( Fig. 7D ).

Remarks

Xiphocentron matsigenka sp. nov. is described from the South Brazilian dominion, Rondônia Province, and is most similar to X. cuyensis and X. caenina , known from the same dominion, Yungas Province. All these species have a slender flange along anterior margin of sternum IX, inferior appendage with short to medium-length stout spines, basal region spines present, and mesal sclerite absent.

Figures

Fig. 1. Distribution of species of Xiphocentronidae Ross, 1949 in Western South America. Species of Machairocentron Schmid, 1982 are indicated in white boxes, those of Xiphocentron Brauer, 1870 in black circles and those of Caenocentron Schmid, 1982 in white circles. Tropical rainforests are shown in green.

Fig. 7. Xiphocentron matsigenka sp. nov., holotype, male genitalia (MUSM-ENT-0320566). A. Lateral view, with detail of paraproct. B. Dorsal view. C. Ventral view. D. Phallus, dorsal and lateral views, respectively. E. Phallus in full length, dorsal view.