Triaenodes oaxacensis, 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 : 30-31

Triaenodes oaxacensis , new species

Fig. 22

This is another species which lacks an apicoventral projection on the inferior appendage, but like other species with that character state, it stands apart from the rest. The shape of tergum X and its short, digitate, dorsomesal process, the broad preanal appendage, and the striate parameres combine to render the species unique within this group.

Adult (male: n=7). Forewing length 7.7–8.3, 8.0 mm; hind wing length 6.1–6.4, 6.3 mm. Eye 0.42–0.47, 0.43 mm wide. Antennal scape 0.50–0.56, 0.53 mm long. Maxillary palp segment lengths (in mm): 0.32–0.40, 0.35; 0.42–0.47, 0.45; 0.58–0.64, 0.61; 0.27– 0.35, 0.31; 0.55–0.60, 0.57. 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 very lightly sclerotized, setose; tergum IX, in dorsal view, with posteromesal margin rounded, dorsomesal papillae not evident; sternum IX in lateral view with posterior margin slightly sinuate. Preanal appendage setose, at least twice as long as wide, broad basally, apex rounded. Dorsomesal process of tergum X digitate, originating basally, short, less than half length of tergum X, with apical setae; tergum X, in dorsal view, with lateral margins sinuate, narrowing apically, apex slightly excavate medially, slightly upturned; in lateral view, parallel sided, apex rounded, apicolateral margins with microtrichia. Inferior appendage rounded basally, setose, without apicoventral projection; recurved process gradually downturned, narrow, tapering throughout length, but constricted subapically, apex attenuate; apicomesal lobe heavily setose, elongate, narrow, parallel sided. Phallobase small, triangular, endothecal membranes prominent, highly convoluted, with three parameres, two parameres short, stout, third longer, straight, all heavily striate; phalicata troughlike, strongly curved, widest medially, abruptly tapering apically, apex very thin, acute, phallotremal sclerite not evident.

Holotype male: MEXICO: Oaxaca: 1 mi. NE of Ixtlan de Juarez , 13.viii.1967, O S Flint ( UMSP000083651 ) ( NMNH).

Paratypes: MEXICO: Oaxaca: 1 mi. NE of Ixtlan de Juarez , 13.viii.1967, O S Flint — 6 males ( NMNH) .

Distribution. Mexico.

Etymology. Named for the state of Oaxaca, Mexico, where the types were collected.

Figures

FIGURE 22. Triaenodes oaxacensis, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, lateral.