Xiphocentron (Antillotrichia) ashaninka, 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 : 69-70

Xiphocentron (Antillotrichia) ashaninka sp. nov.

urn:lsid:zoobank.org:act:CAE28FA9-AE66-4480-A930-62838EB3F7C3

Figs 1 , 5

Diagnosis

Xiphocentron ashaninka sp. nov. is most similar to X. sturmi Sturm, 1960 and X. regulare Flint, 1991 , based on the shape of tergum IX and the sclerotized lateral margin of the paraproct as seen in dorsal view. It can be distinguished by: a) the narrower incision at the posterior margin of tergum IX, in dorsal view ( Fig. 5B ) (incision wider in the other species); b) the shorter spines of the inferior appendage ( Fig. 5A–C ) (the other species have long spines at the mesal sclerite region); c) the narrower and longer preanal and inferior appendages, in lateral view ( Fig. 5A ); and d) the enlarged preanal appendage, in dorsal view ( Fig. 5B ).

Etymology

Named after the Ashaninka, a people from the Arawak linguistic family. The Ashaninka are the most populous native Amazonian group in Peru, with over 55000 people in the country identifying as Ashaninka.

Material examined

Holotype PERU • ♂; Cusco, La Convención Echarate , Pagoreni-8 , Shell prospecting and development project; 11.70326° S, 72.90134° W; elev. 486 m; 27 May 1997; Córdova leg.; MUSM- ENT-0320562 .

Additional material

PERU • 2 ♀♀; same collection data as for holotype; MUSM- ENT-0320563 .

Description of male

BODY. Forewing length 5.2 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 sessile at discoidal cell; discoidal cell about half of thyridial cell length. Hindwing forks II and V present. Sternum V with flat anterolateral reticulated region.

GENITALIA ( Fig. 5 ). Tergum IX, in lateral view, wider basally, narrower apically, about 1.5× as long as high ( Fig. 5A ); in dorsal view, anterior margin with deep, wide concave incision; posterior margin with deep U-shaped mesal incision, anterior and posterior incisions almost touching each other ( Fig. 5B ). Sternum IX, in lateral view, about 2× as long as high, apex deltoid; anterior apodeme narrow, straight, tapering to slender flange ( Fig. 5A ); in ventral view, posterior margin with shallow V-shaped mesal incision ( Fig. 5C ). Paraproct, in lateral view, oblong, apically rounded, with small ventral lobe ( Fig. 5A ); in dorsal view, each side fused, with sclerotized band on fusion region and sclerotized strips coming from lateral sides ( Fig. 5B ); wide basally, tapering apically; divided apicomesally until sclerotized band, with numerous sensillae on semi-membranous apex ( Fig. 5B ). Preanal appendage about 4× as long as tergum IX, setose; in lateral view, narrow, bent at basal ⅓, wavy curved, slightly enlarging apically ( Fig. 5A ); in dorsal view, enlarged at midlength, narrow at apex ( Fig. 5B ). Inferior appendage about 3× as long as tergum IX, setose; coxopodite and harpago partially fused, with dorsal incision between them; basal region wide, without spines; apical region slender, digitate ( Fig. 5A–C ); in lateral view, about 2 × length of basal region; inner face with various short, tubercle-like spines, more concentrated at midlength; mesal sclerite absent ( Fig. 5A ). Phallus tubular, very long and slender, reaching segment V; basally conical, subapically annulate, weakly sclerotized; apex slightly enlarged ( Fig. 5D ).

Remarks

The new species is described from the South Brazilian dominion, Rondônia Province, and has a strong similarity with X. regulare and X. sturmi , known from the Pacific dominion, Cauca Province. This group of species is particularly recognizable by the deep concavities on the anterior and posterior margins of tergum IX.

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. 5. Xiphocentron ashaninka sp. nov., holotype, male genitalia (MUSM-ENT-0320562). A. Lateral view, with detail of paraproct. B. Dorsal view. C. Ventral view. D. Phallus, dorsal and lateral views, respectively.