Triaenodes acanthus, Holzenthal & Contents, 2004

Holzenthal, Ralph W. & Contents, Trond Andersen Table Of, 2004, The caddisfly genus Triaenodes in the Neotropics (Trichoptera: Leptoceridae), Zootaxa 511 (1), pp. 1-80 : 15

Triaenodes acanthus , new species

Fig. 6 , 30

The subapicoventral projection on the recurved process of the inferior appendage and the long, striate, denticulate parameres render this new species unique among those related species possessing apicoventral projections of the inferior appendages and digitate dorsomesal processes of tergum X.

Adult (male: n=2). Forewing length 6.1–6.6 mm, hind wing length 4.9–5.1 mm. Eye 0.39–0.41 mm wide. Antennal scape 0.42–0.45 mm long. Maxillary palp segment lengths (in mm): 0.26–0.31, 0.38–0.39, 0.53–0.56, 0.23, 0.52. Forewing light brown, denuded.

Male genitalia. Abdominal segment IX anterior margin nearly straight, slightly produced anteroventrally; pleural region membranous, setose; tergum IX, in dorsal view, with posteromesal margin indistinct, dorsomesal papillae not evident; sternum IX in lateral view with posterior margin sinuate. Preanal appendage setose, about as long as wide, constricted basally, apex subacute. Dorsomesal process of tergum X digitate, originating basally, short, about half length of tergum X, with apical setae; tergum X, in dorsal view, with lateral margins subtriangular, apex slightly excavate medially; in lateral view, parallel sided, apex rounded, slightly excavate subapicoventrally, with lateral flange, apicolateral margins with microtrichia. Inferior appendage subquadrangular basally, setose, with long, tapering, apicoventral projection; recurved process gradually downturned, broad along basal 2/3, with subapicoventral projection, apex sharply attenuate; apicomesal lobe heavily setose, elongate, elliptical. Phallobase small, triangular, endothecal membranes prominent, highly convoluted, with pair of parameres, parameres subequal, long, straight, tapering, with longitudinal striae and subapical denticle; phalicata troughlike, straight, narrow throughout length, apex with deep, wide cleft, phallotremal sclerite large, u­shaped.

Holotype male: MEXICO: Veracruz: Río Jamapa , 6 km. N Coscomatepec, 26.v.1981, C & O Flint — 1 male ( UMSP000067429 ) ( NMNH).

Paratype: MEXICO: Veracruz: Fortin de las Flores, 22.v.1965, Rabago — 1 male ( NMNH) .

Distribution. Mexico.

Etymology. From akantha the Greek word for thorn or prickle, referring to the sharp, thornlike apicoventral projection on the recurved process of the inferior appendage.

Figures

FIGURE 6. Triaenodes acanthus, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, lateral; E—apices of parameres, lateral; F—apex of phallus, ventral; G—apex of recurved process of inferior appendage.

FIGURE 30. Triaenodes anomalus Flint. Female genitalia: A—lateral; B—dorsal; C—ventral.