Triaenodes delicatus Navás, 1924

Holzenthal, Ralph W. & Contents, Trond Andersen Table Of, 2004, The caddisfly genus Triaenodes in the Neotropics (Trichoptera: Leptoceridae), Zootaxa 511 (1), pp. 1-80 : 20-23

Triaenodes delicatus Navás

Fig. 3 –4, 11–12, 33

Triaenodes delicatus Navás, 1924: 84 [Type locality: Costa Rica, La Caja; MNHNP; male].

Triaenodes delicatus is a highly variable species, especially in the structure of the apex of tergum X. The latter shows much intraspecific variation, even among individuals collected at the same time and place ( Fig. 12 ). The apex of tergum X can range from acute and slightly upturned ( Fig. 11A ) to rounded ( Fig.12F ) or more truncate ( Fig. 12E ), with ( Figs. 12B, E ) or without a small point. Otherwise, the species is quite generalized in its genitalia, perhaps most similar to T. peruanus , from which it can be separated by the overall shape of segment X, which is rounded apically and broader basally. It also bears some resemblance to T. nicaraguensis , which may be nothing more than another variant. However, the dorsomesal process of tergum X is much longer in T. nicaraguensis than in T. delicatus , and the recurved process of the inferior appendage is wider. Until more Triaenodes are collected from Nicaragua, we choose to recognize the Nicaraguan species as distinct from T. delicatus .

Adult (male: n=10, female: n=10). Forewing length 4.6–5.3, 5.0 mm (male), 4.8–6.9, 6.2 mm (female); hind wing length 3.7–4.3, 4.0 mm (male), 4.1–5.3, 4.5 mm (female). Eye 0.35–0.40, 0.37 mm wide (male), 0.39–0.44, 0.41 mm wide (female). Antennal scape 0.37–0.42, 0.40 mm long (male), 0.37–0.47, 0.44 mm long (female). Maxillary palp segment lengths (in mm): 0.26–0.32, 0.29; 0.32–0.39, 0.35; 0.39–0.47, 0.43; 0.21–0.26, 0.25; 0.39–0.47, 0.42 (male); 0.31–0.36, 0.34; 0.35–0.44, 0.40; 0.46–0.53, 0.48; 0.24–0.32, 0.28; 0.48–0.57, 0.55 (female). 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, setose; tergum IX, in dorsal view, with posteromesal margin rounded, with pair of small 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 basally, long, about half length of tergum X, with apical setae; tergum X, in dorsal view, with lateral margins subtriangular, apex variable, truncate with slight excavation or mesal point to acute or slightly rounded; apicolateral margins with microtrichia. Inferior appendage subquadrangular basally, setose, with tapering apicoventral projection; recurved process gradually downturned, narrow, tapering throughout length, apex attenuate; apicomesal lobe heavily setose, elongate, narrow, slightly broadened subbasally. Phallobase small, triangular, endothecal membranes prominent, highly convoluted, with pair of parameres, parameres subequal, long, curved, tapering, with small medial denticle; phalicata troughlike, gently curved, narrow throughout length, apex acute, phallotremal sclerite not evident.

Female genitalia. Abdominal segment VIII with sternum setose posteriorly, pleural region highly membranous. Posterior margin tergum IX triangular in dorsal view, with pair of small papillose lobes. Valves heavily setose, elliptical. Tergum X setose, subquadrate in lateral view, ventrolateral margin rounded, apex acute; in dorsal view constricted medially, apex rounded. Appendage of segment X setose, narrow basally, elliptical. Structures of internal genitalia as in Figs. 33A, C ; vaginal chamber in ventral view circular.

Material examined. COSTA RICA: Alajuela: Reserva Forestal San Ramón, Río San Lorencito & tribs., 10°12’58”N, 084°36’25”W, 980 m, 2–4.vii.1986, Holzenthal, Heyn & Armitage — 2 females ( UMSP) ; 13–16.vi.1988, C & O Flint & Holzenthal — 1 male ( UMSP) ; 6–10.iii.1991, Holzenthal, Muñoz & Huisman — 1 female, 1 male ( UMSP) ; Reserva Bosque Nubosa Monte Verde, Río Peñas Blancas , 10°18’00”N, 084°44’24”W, 950 m , 1.iii.1986, Holzenthal & Fasth — 1 female ( UMSP) ; Guanacaste: Parque Nacional Rincón de la Vieja, Quebrada Agua Apinolada , 10°47’42”N, 085°17’31”W, 795 m , 25.vi.1986, Holzenthal, Heyn & Armitage — 1 male ( UMSP) ; Parque Nacional Guanacaste, Río Tempisquito, Estacion Maritza , 10°57’29”N, 085°29’49”W, 550 m , 19– 20.vii.1987, Holzenthal, Morse & Clausen — 1 female, 6 males ( UMSP) ; 17–18.vi.1988, Flint & Holzenthal — 3 males ( UMSP) ; 30–31.viii.1990, Huisman, Blahnik & Quesada — 2 males ( UMSP) ; Quebrada Alcornoque , El Hacha, 11°00’32”N, 085°34’37”W, 250 m , 26.vii.1987, Holzenthal, Morse & Clausen — 3 females, 5 males ( UMSP) ; Quebrada Pedregal , El Hacha, 10°58’59”N, 085°32’20”W, 300 m , 27.vii.1987, Holzenthal, Morse & Clausen — 1 female, 1 male ( INBIO) ; ca. 0.7 km N Est. Maritza , 10°57’36”N, 085°30’00”E, 550 m , 31.viii.1990, Huisman & Quesada — 1 male ( UMSP) ; Limón: Reserva Biolgica Hitoy­Cerere, Río Cerere , 500 m, 09°40’16”N, 083°01’41”W, 90 , 23– 24.iii.1987, Holzenthal, Hamilton & Heyn — 1 male ( UMSP) ; Parque Nacional Braulio Carrillo, Quebrada González , 10°09’36”N, 083°56’20”W, 480 m , 12–14.v.1990, Holzenthal & Blahnik — 1 male ( UMSP) ; Puntarenas: Río Guineal , ca 1 km (air) E Finca Helechales, 09°04’34”N, 083°05’31”W, 840 m , 4.viii.1987, Holzenthal, Morse & Clausen — 1 male ( UMSP) ; Río Jaba , rock quarry, 1.4 km (air) W Las Cruces, 08°47’24”N, 082°58’12”W, 1150 m , 14.vi.1986, Holzenthal, Heyn & Armitage — 1 male ( UMSP) ; 9.viii.1990, Holzenthal, Blahnik & Muñoz — 2 females, 8 males ( UMSP) ; 15.iii.1991, Holzenthal, Muñoz & Huisman — 1 female, 5 males ( UMSP) ; Jardín Botanico R & C Wilson, unnamed trib., Sendero del Agua , 08°48’00”N, 082°57’36”W, 1180 m , 8.viii.1990, Holzenthal, Blahnik & Muñoz — 2 males ( UMSP) ; Arenal , Queb. Tronadorcita , 24.vii.1967, O S Flint — 1 male ( UMSP) ; San José: Escazu , 20–27.v.1987, H Townes — 2 females, 3 males ( UMSP) . PANAMA: Bocas del Toro: Miramar , 09°00’00”N, 082°15’00”W , 26.xii.1979 – 1.i.1980, H Wolda — 1 male ( NMNH) ; Canal Zone: Juan Gallegas , 3.vi.1981, R B Kimsey — 2 males ( CAS) ; Chiriqui: Fortuna Dam Site nr. Hornitos , 08°55’00”N, 082°16’00”W, 1050 m , 20–26.xii.1978, H Wolda — 2 males ( NMNH) ; Panama: Canal Zone, Barro Colorado Island , 27.ii.1967, R D Akre — 2 males ( CAS) ; 9.iii.1967, R D Akre — 3 males ( CAS) ; 12.iii.1967, R D Akre — 1 female, 3 males ( CAS) ; Barro Colorado Island , Snyder­Molino Trail, marker 3 , 19–25.vii.1978, H Wolda — 2 males ( NMNH) ; 18–24.x.1978, H Wolda — 1 female, 1 male ( NMNH) ; 8– 14.xi.1978, H Wolda — 1 male ( NMNH) ; 22–28.xi.1978, H Wolda — 1 male ( NMNH) ; 6–12.xii.1978, H Wolda — 5 males ( NMNH) ; 27.xii.1978 – 2.i.1979, H Wolda — 1 male ( NMNH) ; 3–9.i.1979, H Wolda — 2 males ( NMNH) ; 10–16.i.1979, H Wolda — 1 male ( NMNH) ; 24–30.i.1979, H Wolda — 1 male ( NMNH) ; 31.i.–6.ii.1979, H Wolda — 2 males ( NMNH) ; 7–13.ii.1979, H Wolda — 1 male ( NMNH) ; 21–27.ii.1979, H Wolda — 1 male ( NMNH) ; 28.ii.–6.iii.1979, H Wolda — 1 male ( NMNH) ; 16–22.v.1979, H Wolda — 1 male ( NMNH) ; 30.v.–5.vi.1979, H Wolda — 3 males ( NMNH) ; 6–12.vi.1979, H Wolda — 2 females, 1 male ( NMNH) ; 22–28.viii.1979, H Wolda — 1 male ( NMNH) ; 29.viii.–4.ix.1979, H Wolda — 1 male ( NMNH) ; 5–11.ix.1979, H Wolda — 1 male ( NMNH) ; 19–25.ix.1979, H Wolda — 1 male ( NMNH) ; 31.x.–6.xi.1979, H Wolda — 2 males ( NMNH) ; 7–13.xi.1979, H Wolda — 3 males ( NMNH) ; 21–27.xi.1979, H Wolda — 2 males ( NMNH) ; 20.iv.–30.vi.1987, H Wolda — 1 female, 5 males ( NMNH) ; 26.viii. –1.ix.1987, H Wolda — 1 male ( NMNH) ; 9–15.ix.1987, H Wolda — 1 male ( NMNH) ; 7.x.–15.xii.1987, H Wolda — 2 females, 4 males ( NMNH) ; 13.iv.–10.v.1988, H Wolda — 2 males ( NMNH) ; 31.viii.–29.ix.1988, H Wolda — 2 females, 11 males ( NMNH) ; 29.iii.– 18.vii.1989, H Wolda — 6 males ( NMNH) ; 27.ix.–5.xii.1989, H Wolda — 7 males ( NMNH) ; 28.xii.1989 – 3.i.1990, H Wolda — 1 male ( NMNH) ; 24–30.i.1990, H Wolda — 1 male ( NMNH) ; 25.iv–1.v.1990, H Wolda — 1 male ( NMNH) ; 5.ix.–25.xii.1990, H Wolda — 8 males ( NMNH) ; 16.i.–19.ii.1991, H Wolda — 2 males ( NMNH) .

Distribution. Costa Rica, Panama.

Figures

FIGURE 3. Triaenodes delicatus Navás. Adult: A—head and thorax, dorsal. FIGURE 4. Triaenodes delicatus Navás. Wings: A—forewing; B—hind wing.

FIGURE 11. Triaenodes delicatus Navás. Male genitalia: A—lateral; B—dorsal; C—ventral; D— phallus, lateral, inset: apex of phalicata, ventral.

FIGURE 12. Triaenodes delicatus Navás. Male genitalia, variation in tergum X, lateral and dorsal views, all specimens from Panama, Barro Colorado Island, Synder­Molino trail: A—specimen from alcohol lot UMSP000065131; B—specimen from alcohol lot UMSP000065132; C—specimen from alcohol lot UMSP000065132; D—specimen from alcohol lot UMSP000065132; E—specimen from alcohol lot UMSP000065131; F—specimen from alcohol lot UMSP000065132.

FIGURE 33. Triaenodes delicatus Navás. Female genitalia: A—lateral; B—dorsal; C—ventral.