Phylloicus pirapo, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 87-88

Phylloicus pirapo , new species

Figs. 90 , 91

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Phylloicus pirapo is most similar to P. abdominalis and P. perija . Phylloicus pirapo lacks the white spot on the forewing nygma, but the lateral sclerite of abdominal tergum IV ( Fig. 90F ) is better developed and spatulate, resembling that of P. spectabilis .

Adult. Forewing length 8.7­10.2 mm, n = 19.

Head chestnut brown. Maxillary palps dark brown. Antenna twice forewing length; chestnut brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Dorsal pterothorax chestnut brown; ventrolateral thorax golden brown. Femora golden brown; foretibiae golden brown; mesotibiae dark brown; metatibiae dark brown; foretarsi golden brown; mesotarsi white; metatarsi dark brown. Metathoracic leg of male with posterior fringe of long setae, setae dark. Tibial spur formula 2,4,4. Forewing flat; dark brown; with two transverse bands; proximal band white, reaching posterior wing margin, at least 1/2 width of wing, narrow, less than 10 setae wide; distal band white, not reaching either wing margin, 1/2 width of wing or less, narrow, less than 10 setae wide; with two basal stripes, golden. Hind wing basal brush present in male, dark brown.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures present. Tergum III with simple lateral sclerites. Tergum IV with paired posterior processes and paired lateral sclerites, mesal coremata and lateral coremata; posterior process truncate; lateral sclerite spatulate, directed laterally; lateral coremata with basal globose lobes and long tubular posterior lobe; mesal coremata single­lobed, setose basally. Tergum V without sclerotized modifications ( Fig. 90F ). Sternum VII with short, acute anteromesal process. Sternum VIII enclosing base of elongate sternum IX; posteromesal process notched ( Fig. 90A, C ). Tergum IX with paired mesal ridges extending 1/2 length of segment; posterior margin smoothly rounded; thinly sclerotized anteromesally ( Fig. 90B ); lateral ridge absent; dorsal pleural setae approximately 5, ventral pleural setae approximately 5 ( Fig. 90A, B ). Preanal appendage longer than tergum X, but less than 11/2 times length, widest apically, setae filamentous, longer than appendage ( Fig. 90A, B ). Tergum X without basal lobes; basodorsal process absent; basolateral processes of varying length and often asymmetrical; apex, in lateral view, rounded, in dorsal view, notched, notch square; setose basodorsally; with short apicodorsal process visible in lateral view ( Fig. 90A, B ). Harpago rounded; peglike setae many, apical ( Fig. 90A, C ). Phallic endotheca with paired basolateral lobes, basolateral lobes large and round and with digitate apical lobe; phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 90D, E ).

Female. Preterminal abdominal terga with anteromesal notch. Sternum VII with short pointed anteromesal process. Tergum VIII without posterolateral brush; sternum VIII posterior margin entire; sternum VIII ( Fig. 91C ). Tergum IX without mesal ridge ( Fig. 91B ). Sternum IX anterior and posterior lobes darkly sclerotized and striate, punctate, with patch of lightly sclerotized cuticle lateral to vaginal opening ( Fig. 91A ). Tergum X appendage shorter than mesal lobe, base indistinct, apex triangular; mesal lobe lightly sclerotized; digitate lateral processes very short, length less than diameter ( Fig. 91B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 91A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite truncate anteriorly, posterolateral projections absent; posterior sclerite ovoid; posterior end of spermatheca a sclerotized expanded tube ( Fig. 91A ).

Holotype male: PARAGUAY: Itapua: Pirapo , i.1972, Peña G. ( NMNH).

Paratypes: ARGENTINA: Misiones: 6 km E El Dorado , 22.xi.1973, Flint — 2 males ( NMNH) ; Ao. Coati, 15 km E San Jose , 18­19.xi.1973, Flint — 1 female ( NMNH) ; PARAGUAY: Villarica, Apr , Schade — 1 male ( MCZ) ; Itapua: Pirapo , 28­31.xii.1971, Peña G. — 5 males ( NMNH) ; — 5 females, 3 males ( UMSP) ; i.1972, Peña G. — 1 female ( NMNH) .

Distribution. Argentina, Paraguay.

Etymology. Named for the type locality, Pirapo, Itapua, Paraguay.

Figures

FIGURE 90. Phylloicus pirapo. Male (A­C, UMSP000010159; D­E, UMSP000010154; F, UMSP000010152): A—lateral view; B—dorsal view; C—sterna VIII, IX, and inferior appendages, ventral view; D—phallus, lateral view; E—phallus, caudoventral view; F—terga III­V, dorsal view.

FIGURE 91. Phylloicus pirapo. Female (UMSP000217076): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.