Triaenodes tuxtlensis, 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 : 37-38

Triaenodes tuxtlensis , new species

Fig. 28

Triaenodes tuxtlensis , like many other Neotropical Triaenodes , has an apicoventral projection on the inferior appendage and a digitate dorsomesal process on tergum X. It is distinctive from all other similar species in the deeply divided parameres and the minute spines on the basoventral margin of the dorsomesal process of tergum X.

Adult (male: n=1). Forewing length 5.8 mm, hind wing length 4.7 mm. Eye 0.42 mm wide. Antennal scape 0.48 mm long. Maxillary palp segment lengths (in mm): 0.24, 0.34, 0.47, 0.23, 0.50. Forewing golden brown, with narrow line of cream colored hairs along anal margin.

Male genitalia. Abdominal segment IX anterior margin slightly rounded, slightly produced anteroventrally; pleural region membranous, sparsely setose (or not evident); tergum IX, in dorsal view, with posteromesal margin indistinct, with pair of slender dorsomesal papillae; 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 medially, long, extending beyond apex of tergum X, with apical setae, basoventral margin with minute spines; tergum X, in dorsal view, with lateral margins subtriangular, apex slightly excavate medially; in lateral view, parallel sided, apex rounded, with lateral flange, apicolateral margins with microtrichia. Inferior appendage subquadrangular basally, setose, with long, tapering, apicoventral projection; recurved process gradually downturned, narrow, tapering throughout length, apex attenuate; apicomesal lobe heavily setose, elongate, narrow, parallel sided. Phallobase small, triangular, endothecal membranes prominent, highly convoluted, with pair of parameres, parameres subequal, long, straight, tapering, both bifid almost to base; phalicata troughlike, gently curved, narrow throughout length, apex cleft, phallotremal sclerite small, ushaped.

Holotype male: MEXICO: Veracruz: Los Tuxtlas Biological Station, Los Tuxtlas area, Río Palma , above La Palma , 7–14.v.1981, C & O Flint ( UMSP000083659 ) ( NMNH).

Distribution. Mexico.

Etymology. Named for the type locality, Los Tuxtlas Biological Station, Mexico.

Figures

FIGURE 28. Triaenodes tuxtlensis, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, lateral, inset: apex of paramere, lateral.