Xiphocentron (Glyphocentron) flinti Bueno, Vilarino & Barba, 2022

Bueno-Soria, Joaquin, Vilarino, Albane, Barba-Alvarez, Rafael & Ballesteros-Barrera, Claudia, 2022, Three new species of Xiphocentron Brauer, 1870 (Trichoptera, Xiphocentronidae) from Mexico, ZooKeys 1111, pp. 199-213 : 199

Xiphocentron (Glyphocentron) flinti Bueno, Vilarino & Barba sp. nov.

Figures 1 , 2 , 6

Diagnosis.

This new species is very distinct from all other Xiphocentron species. The group of long, mesally situated setae on the basal portion of the inferior appendages has some resemblance to species in the subgenus Xiphocentron Xiphocentron , whereas the complex tergum X is similar to species in the subgenus Xiphocentron Glyphocentron . Xiphocentron (G.) flinti sp. nov. can be distinguished from all the species of the family by the unique tergum X which bears long spines on the preapical and apical margin and visible in both dorsal and ventral views.

Description.

Adult. Forewing length 4.8-9.0 mm, n = 16; fork II and fork IV present; Sc reaching C subapically, meeting R1 apically; fork II sessile at discoidal cell, with crossvein between R5 and M1+2; thyridial cell shorter than discoidal cell; three anal veins present (Fig. 1 ). Hindwing with fork II and fork V present. Color fuscous. Tibial spur formula 2-4-3. Hind tibia apical spurs not modified. Sternum V bearing pair of reticulated regions.

Male genitalia. Tergum IX small, ellipsoidal; in lateral view, rounded ventrally, narrow dorsally, anterior margin straight; in dorsal view anterior margin with wide, deep, U-shaped mesal emargination; apical margin rounded. Sternum IX subtriangular, in lateral view, about two times as long as high; anterior margin with elongate, wide, mesal apodeme; ventral margin rounded; posterior margin rounded; in ventral view, anterior margin with deep, U-shaped emargination, enlarging apically; posterior margin rounded. Tergum X in lateral view, subrectangular, narrow basally, wide mesally, with a group of spinelike setae, preapically rectilinear, apically bifurcated in two lobes, ventral lobe longer with group of long spinelike setae, dorsal lobe shorter with apical spinelike setae, anterior margin curved; in dorsal view, subtriangular, wide basally, narrow apically, lateral surface sclerotized, mesally membranous; apex with deep cleft, forming two rounded membranous lobes, bearing preapical spinelike setae, apices divergent; in ventral view, apex with two long mesal spinelike setae. Preanal appendages long, dorsal margin crenulate, in lateral view, broad, parallel-sided, with longitudinal ridge, apex rounded; in dorsal view, enlarged basally, narrowed at middle. Inferior appendage short, approximately half length of preanal appendages, basal section with a group of long spinelike setae; in lateral view, basal section broad, apical section narrow; in ventral view, basal section subtriangular, with a line of large spinelike setae, apical section long and thin, curved mesad; basal plate short, shorter than half sternum IX length. Phallus, long, slender, tubular, apex enlarged, with narrow curved sclerite.

Female genitalia. VIII segment long and narrow, synscleritous dorsally, internally with a pair of long slender apodemes from anterior margin; intersegmental membrane nearly as long as IX segment when extended. IX segment long and slender, with a pair of internal apodemes arising from anterior margin; apex with a pair of slender processes.

Type material.

Holotype: ♂ Mexico, Chihuahua, Ruta San Rafael-Cuiteco, 27°26'13"N, 108°00'32"W, elev. 1707 m, 30.VIII.2005, J. Bueno and R. Barba leg. pinned with abdomen in glycerin (CNIN). Paratypes: ibid., Chihuahua, Riito, Hwy. 16, 10 mi E. Yepachic 28°10'26"N, 108°10'36"W, elev. 2086 m, 28.VI.1987, R. Baumann, B. Kondratieff, Sargent and Wells leg. 8♂ 8♀ in alcohol (USNM); ibid., small stream Cascada de Basaseachic, 28°10'52"N, 108°12'44"W, elev. 1950 m, 28.VI.1987, B. Kondratieff and R. Baumann leg. 1♂ in alcohol (USNM); ibid., Cascada de Basaseachic, 22.VIII.1986, B. Kondratieff leg. 1♂ pinned (USNMENTO1518156); ibid., fork Arroyo Bandera near Jct. Río Chuhuichupa, 25.VI.1987, B. Kondratieff and R. Baumann leg. 1♂ 1♀ in alcohol (USNM).

Etymology.

We dedicated this species, with sadness and love, to the memory of a great entomologist, Dr Oliver S. Flint Jr, who passed away on May 18, 2019.

Distribution.

All the specimens were collected at Sierra Tarahumara, the mountain region of Chihuahua State (Fig. 6 ).

Remarks.

The affinities of Xiphocentron (Glyphocentron) flinti sp. nov. are not very clear. The preanal appendages present a mesal ridge, a character present in the species of the genus Melanotrichia . The long setae on the basal portion of the inferior appendages in this species are similar to species within the subgenus X. (Xiphocentron) or even to Cnodocentron (Caenocentron) . The complex tergum X with apical points puts it closer to the subgenus X. (Glyphocentron) . The new species lacks other diagnostic characters of Melanotrichia (fan-like spine line), Cnodocentron (bifurcate inferior appendage), or X. (Xiphocentron) (modified hind leg spurs, and presence of forewing fork I); therefore, we are placing it within subgenus X. (Glyphocentron) , for which the diagnostic character is the presence of points on tergum X ( Schmid 1982).

Figures

Figure 1. Xiphocentron (Glyphocentron) flinti sp. nov., holotype, adult, ♂ A forewing and hindwing. Male genitalia B left lateral C dorsal D ventral E phallus, apex in lateral and dorsal view F detail of right inferior appendage mesal surface, lateral and ventral view G detail of segment X left lateral.

Figure 2. Xiphocentron (Glyphocentron) flinti sp. nov., paratype, adult, ♀, genitalia A lateral B dorsal view.

Figure 6. Mexican distribution of the new species of Xiphocentron and X. (Antillotrichia) rhamnes Schmid, 1982.