Xiphocentron (Antillotrichia) holzenthali 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 (Antillotrichia) holzenthali Bueno, Vilarino & Barba sp. nov.

Figures 3 , 6

Diagnosis.

This new species is very similar to Xiphocentron (Antillotrichia) serestus Schmid, 1982. However, Xiphocentron (Antillotrichia) holzenthali sp. nov. can be separated from X. (Antillotrichia) serestus by the shape of the tergum IX, as viewed dorsally; in X. (Antillotrichia) holzenthali sp. nov. the apical margin has a narrow, rounded, mesal emargination, while in X. (Antillotrichia) serestus the mesal emargination is wide and shallow. In the new species, the apical margin of sternum IX, in ventral view, has a narrow, rounded, mesal emargination, while in X. (Antillotrichia) serestus this margin has a trilobed mesal emargination. Also, in the new species the inferior appendage, in ventral view, has a spiny projection near the basal plate, which is absent in X. (Antillotrichia) serestus .

Description.

Adult. Forewing length 6-7 mm, n = 5. Color in alcohol pale. Tibial spur formula 2-4-3. Hind tibia apical spurs not modified. Sternum V bearing pair of reticulated regions.

Male genitalia. Tergum IX semicircular; in lateral view, wide basally, narrow apically; dorsal margin curved; ventral margin nearly straight; in dorsal view anterior margin with deep V-shaped central incision; apical margin with narrow, rounded, mesal emargination. Sternum IX ovate, in lateral view, about twice as long as high; anterior margin with slender, pointed, mesal apodeme; ventral margin rounded; dorsal margin subtriangular; in ventral view, enlarging preapically; anterior margin rectilinear; posterior margin with small mesal emargination. Tergum X in lateral view, rectangular, narrow, acute apically; in dorsal view, subtriangular, wide basally, narrow apically; lateral surface sclerotized, each sclerotized side fused mesally; apex with deep, V-shaped emargination; in ventral view, subtriangular, wide basally, narrow, cleft apically. Preanal appendages long, margins crenulate, surface weakly setose; in lateral view, broad basally, parallel-sided, narrow preapically, apex rounded. Inferior appendages, in lateral view long, approximately same length as preanal appendages, weakly setose; widest basally and mesally, apical section narrower, slender, upturned, and curved; mesal surface, with short, thick, peglike setae, separated in two, small patches, visible in ventral and dorsal view; in ventral view with spiny projection near basal plate; basal plate long, about as long as half sternum IX length. Phallus long, slender, tubular, slender apically.

Female genitalia (not illustrated). VIII segment narrowly divided dorsally, internally with pair of long slender apodemes from anterior margin; intersegmental membrane nearly as long as IX segment when extended. IX segment long and slender with pair of internal apodemes arising from anterior margin; apex with pair of slender processes.

Type material.

Holotype: ♂ Mexico: Chihuahua, Jct. E & W Forks Arroyo Toro, Toro Basin 28°06'35"N, 107°37'28"W, elev. 2425 m, 23.VI. 1987, B. Kondratieff and R. Baumann leg. in glycerin (USNM). Paratype s: ibid., 1♂1♀ in glycerin (USNM); Chihuahua, Arroyo Chuchupate, Trib. Río Chuhuichup 28°48'08"N, 107°24'43"W, elev. 2426 m, 23.VI.1987, B. Kondratieff and R. Baumann leg. 2♂ in glycerin (USNM).

Etymology.

We name this species in honor of Dr Ralph Holzenthal in recognition of his great contribution to the knowledge of the systematics and distribution of Neotropical caddisflies.

Distribution.

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

Figures

Figure 3. Xiphocentron (Antillotrichia) holzenthali sp. nov., holotype, adult, ♂, genitalia A left lateral B dorsal C ventral D phallus left lateral and dorsal E detail of right inferior appendage mesal surface, lateral and ventral view.

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