Xiphocentron (Antillotrichia) yine, 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 : 75-76

Xiphocentron (Antillotrichia) yine sp. nov.

urn:lsid:zoobank.org:act:B1D9C9E6-CD96-4B50-ADB8-64EE87DBB98C

Figs 1 , 8

Diagnosis

Xiphocentron yine sp. nov. is most similar to Xiphocentron pintada Flint, 1983 and X. steffeni ( Marlier, 1964) based on the shape of preanal appendage and the ornamentation of the inferior appendage. However, the new species can be differentiated by: a) the preanal and inferior appendages about ⅓ longer than in X. pintada , as seen in lateral view ( Fig. 8A ); and b) the inferior appendage with several long spines in the basal region ( Fig. 8A, C ), which are absent in X. pintada and X. steffeni .

Etymology

Named after the Yine people (also known as Piro), an indigenous ethnic group of Peru who have occupied the upper Ucayali River basin and the lower Urubamba River since pre-Hispanic times. The Yine are also known as the “Amazonian Phoenicians” due to their skill as navigators, traveling long distances to trade with various populations.

Material examined

Holotype PERU • ♂; Cusco, La Convención Echarate , Pagoreni-10 , Shell prospecting and development project; 11.70462° S, 72.91256° W; elev. 460 m; 29 Sept. 1997; Córdova leg.; MUSM-ENT-0320567 .

Description of male

BODY. Forewing length 4.2 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 petiolate at discoidal cell; discoidal cell twice as long as thyridial cell. Hindwing forks II and V present. Sternum V with flat anterolateral reticulated region.

GENITALIA ( Figs 8 ). Tergum IX, in lateral view, wider basally, narrower apically ( Fig. 8A ); in dorsal view, anterior margin with deep narrow concave incision; posterior margin with pair of rounded lobes and V-shaped mesal incision ( Fig. 8B ). Sternum IX, in lateral view, about 1.5× as long as high, apex deltoid; anterior apodeme narrow, straight, tapering to slender flange ( Fig. 8A ); in ventral view, posterior margin with concave incision ( Fig. 8C ). Paraproct, in lateral view, oblong, apically rounded, with narrow ventral lobe ( Fig. 8A ); in dorsal view, each side fused, with sclerotized band on fusion region; wide basally, divided apicomesally until sclerotized band, with numerous sensillae on semi-membranous apex ( Fig. 8B ). Preanal appendage about 3× as long as tergum IX, setose; in lateral view, narrow, bent at basal ⅓, with about same width throughout length ( Fig. 8A ); in dorsal view, enlarged at midlength, tapering apically ( Fig. 8B ). Inferior appendage more than 2× length of tergum IX, setose;. coxopodite and harpago completely fused ( Fig. 8A ); basal region wide, with long, weakly sclerotized spine-like setae; apical region slender, digitate ( Fig. 8A–C ); in lateral view, 2× length of basal region, inner face with mesal sclerite and various short, tubercle-like spines, sparsely distributed ( Fig. 8A ); mesal sclerite polyp-like, topped with short spines; in lateral view, about 3× as long as high ( Fig. 8A ). Phallus tubular, very long and slender, reaching segment V; basally conical, subapically annulate, weakly sclerotized; apex slightly enlarged ( Fig. 8D ).

Remarks

Xiphocentron yene sp. nov. is described from the South Brazilian dominion, Rondônia Province, and is most similar to X. pintada , known from the same dominion, Yungas Province, and X. steffeni , known from the Parana dominion. These species have a clavate preanal appendage and a polyp-like mesal sclerite.

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. 8. Xiphocentron yine sp. nov., holotype, male genitalia (MUSM-ENT-0320567). A. Lateral view, with detail of paraproct.B. Dorsal view.C. Ventral view.D. Phallus, dorsal and lateral views, respectively.