Xiphocentron (Antillotrichia) drepanum, Vilarino & Calor, 2024

Vilarino, Albane & Calor, Adolfo R., 2024, Comparative geometric morphometrics of male genitalia in Xiphocentron subgenera (Trichoptera: Xiphocentronidae): new species, revision and phylogenetic systematics of the subgenus Sphagocentron, Arthropod Systematics & amp; Phylogeny 82, pp. 407-431 : 407-431

Xiphocentron (Antillotrichia) drepanum sp. nov.

Figures 13 A – D

Type material.

Holotype FRENCH GUIANA • ♂; Approuague-kaw , Kaw Mtn., 104 mao, 4 ° 33.035 ′ N, 52 ° 11.661 ′ W, Malaise trap, 23. i – 7. ii. 2007, FRG MF 3, N. Jönsson leg., [BOLD: GBMIN 18612-13; GenBank: JQ 239839 ] NHRS TOBI 000003833 .

Diagnosis.

The new species can be diagnosed mainly by the sickle-shape of preanal appendage in dorsal view, in which the mesal margin has a strong concavity and the apex is wide with a mesal pointed projection. This character is unique to this species.

Description.

Male: Body. Forewing length 3.5 mm (n = 1). Color overall brown, forewing pattern uniformly brown. Maxillary palp segment length formula (I = II = III) <IV <V. Tibial spur formula 2: 4: 3; spurs unmodified. Forewing forks II and IV present; fork II sessile at discoidal cell; discoidal slightly shorter than thyridial cell. Hind wing forks II and V present (Fig. 13 A ). Sternum V with short, sclerotized anterolateral projection.

Genitalia (Figs 13 B – D ). Tergum IX, in lateral view, wider basally, narrower apically (Fig. 13 A ); in dorsal view, anterior margin with deep narrow concave incision; posterior margin with round lobes and shallow mesal incision (Fig. 13 C ). Sternum IX, in lateral view, about 2 × as long as high, apex deltoid; anterior apodeme narrow, straight, tapering to narrow flange (Fig. 13 B ); in ventral view, about as long as wide, posterior margin with shallow mesal incision (Fig. 13 D ). Tergum X membranous fused basodorsally to each paraproct (Figs 13 B , 13 C ). Paraproct, in lateral view, oblong, wide at base, tapering apically with submesal angle, apex round, with narrow, short ventral lobe (Fig. 13 B ); in dorsal view, wide basally, divided apicomesally, each side partially fused at base, without clear sclerotized mesal band, apex with several sensillae (Fig. 13 C ). Preanal appendage setose, in lateral view, about 2 × as long as tergum IX, narrow, bent posterad at basal 1 / 3, apically wider and curved upward, apex round (Fig. 13 B ); in dorsal view, sickle-shaped, enlarged at base, narrow at midlength with concave mesal margin, wide at apex with mesal wide pointed projection (Fig. 13 C ). Inferior appendage, in lateral view, about 2 × as long as tergum IX; coxopodite and harpago partialy fused, with shape discontinuity between each article, inner face with longitudinal area of dense, long spine-like setae (Fig. 13 B ); basal region (coxopodite) wide, with small basomesal spine-like setae, mesal sclerite region with dense, long spine-like setae; apical region (harpago) narrow, digitate, 1.5 × as long as basal region (Fig. 13 A ); basal plate in lateral view wide, anteriorly with short, narrow flange (Fig. 13 B ). Phallus tubular, very long and narrow, reaching segment V; basally conical, subapically annulate, weakly sclerotized; apex slightly enlarged.

Etymology.

From the Greek drepánē, ‘ sickle’, in reference to the preanal appendage shape.

Distribution.

French Guiana

Figures

Figure 13. Xiphocentron (Antillotrichia) drepanum sp. nov. Holotype (NHRS), male. A wing venation. Genitalia: B left lateral, C dorsal, D ventral. Genitalia scale bar 0.1 mm.