Phylloicus blahniki, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 35-36

Phylloicus blahniki , new species

Figs. 28 , 29

Phylloicus blahniki is distinguished by the modifications of abdominal segments III and IV of the male. Tergite III is flanged anterolaterally; tergite IV bears a truncate posterior process and the lateral sclerite is short and rounded apically. Only lateral coremata are present, and they consist of four lobes, three of them short and rounded, the posterior lobe slightly elongate ( Fig. 28F ). The few specimens on which this description is based were all teneral or rubbed, so the description of the wing pattern is incomplete. None of the male specimens had the phallic endotheca fully everted, so I am unable to describe the membranous lobes.

Adult. Forewing length 11.7 mm, n = 8.

Head golden brown. Maxillary palps golden brown. Antenna twice forewing length; dark brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Dorsal pterothorax golden brown, anterolateral margins dark brown; ventrolateral thorax golden brown. Femora golden brown; tibiae golden brown; tarsi dark brown. Metathoracic leg of male without posterior fringe. Tibial spur formula 2,4,4. Forewing flat; chestnut brown; with longitudinal stripes; stripes pale tan. Hind wing basal brush present in male and female.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures present. Tergum III with anterolateral flanges and short posterolateral projections. Tergum IV with paired posterior processes and paired lateral sclerites, lateral coremata; posterior process truncate; lateral sclerite narrowed apically; lateral coremata with basal globose lobes. Tergum V without sclerotized modifications ( Fig. 28F ). Sternum VII with short, acute anteromesal process. Sternum VIII similar to anterior sterna, sternum IX not elongate. Tergum IX without mesal ridge; posterior margin smoothly rounded; thinly sclerotized anteromesally ( Fig. 28B ); lateral ridge present; dorsal pleural setae absent, ventral pleural setae approximately 10 ( Fig. 28A ); sternum IX with faint mesolateral ridges; sternum IX ( Fig. 28C ). Preanal appendage longer than tergum X, but less than 11/2 times length, of uniform diameter throughout length, setae long, but not filamentous or longer than appendage ( Fig. 28A, B ). Tergum X without basal lobes; basodorsal process absent; basolateral processes absent; apex, in lateral view, acute, in dorsal view, notched, notch triangular; base of tergum X setose; tapered apically ( Fig. 28A, B ). Harpago slightly tapered; peglike setae few, apical ( Fig. 28A, C ). Phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoeshaped ( Fig. 28D, E ).

Female. Preterminal abdominal terga with anteromesal notch. Sternum VII with short pointed anteromesal process. Tergum VIII without posterolateral brush; sternum VIII cleft posteromesally to anterior ridge; sternum VIII ( Fig. 29C ). Tergum IX without mesal ridge ( Fig. 29B ). Sternum IX anterior and posterior lobes darkly sclerotized and striate, with patch of lightly sclerotized cuticle lateral to vaginal opening ( Fig. 29A ). Tergum X appendage longer than mesal lobe, base indistinct, apex rounded; mesal lobe lightly sclerotized; digitate lateral processes long, at least twice diameter and often asymmetrical ( Fig. 29B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 29A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite rounded anteriorly, posterolateral projections acute; posterior sclerite triangular ( Fig. 29A ).

Holotype male: COSTA RICA: Puntarenas: Parque Nacional Corcovado , unnamed stream, Piedra el Arco, 08°34'55”N, 83°42'32"W, 20 m, 10.iv.1989, Holzenthal & Blahnik ( UMSP).

Paratypes: COSTA RICA: Puntarenas: Quebrada Pita, ca. 3 km (air) W Golfito , 08°38'31”N, 83°11'35"W, 15 m, 15.ii.1986, Holzenthal, Morse, & Fasth — 1 male ( UMSP) ; Corcovado National Park, Osa Peninsula , 15­22.iii.1979, Janzen — 2 males ( INBIO) ; Parque Nacional Corcovado, Rio Camaronal , 08°28'55”N, 83°35'20"E, 30 m, 13.iv.1989, Holzenthal & Blahnik — 1 female, 2 males ( UMSP) ; PANAMA: Panama: Canal Zone, Barro Colorado Island, Snyder­Molino trail, marker 3, 28.ix.­4.x.1988, Wolda — 1 male ( NMNH) .

Distribution. Costa Rica, Panama.

Etymology. This species is named for Roger J. Blahnik, who collected the type specimen.

Figures

FIGURE 28. Phylloicus blahniki. Male (UMSP000048732): A—lateral view; B—dorsal view; C— ventral view; D—phallus, lateral view; E—phallotremal sclerites, dorsal view; F—terga III­IV, dorsal view.

FIGURE 29. Phylloicus blahniki. Female (UMSP000067615): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.