Phylloicus brevior Banks

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 36-38

Phylloicus brevior Banks

Figs. 30 , 31

Phylloicus brevior Banks, 1915:632 [Type locality: Guyana, Bartica; MCZ; male]. — Flint 1967:18 [male]; 1974b:139 [male, distribution].

This species is most similar to P. auratus and elektoros . The forewings of P. brevior are much darker than those of either of the first two species. The broad posterolateral flange of tergum IV and single­lobed coremata ( Fig. 30F ), and the shape of tergum X ( Fig. 30A, B ) are also distinctive in P. brevior . The phallus is very similar in all three species, except that where the first two species have a single long posterodorsal process, in P. brevior there are instead very short paired processes ( Fig. 30D, E ).

Adult. Forewing length 9.4­10.4 mm, n = 52.

Head golden brown, setae on warts golden. 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 darker; ventrolateral thorax golden brown. Femora golden brown; foretibiae golden brown; mesotibiae golden brown; metatibiae dark brown; tarsi dark brown. Metathoracic leg of male with posterior fringe of long setae, setae dark. Tibial spur formula 2,4,4. Forewing flat; chestnut brown; with longitudinal stripes; 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 IV with expanded lateral flanges, lateral coremata; lateral coremata single­lobed and originating from pleural membrane of tergum IV, slightly tapered apically; when flaccid, apex folded under posterolateral flange of tergum IV. Tergum V without sclerotized modifications ( Fig. 30F ). Sternum VII with short, acute anteromesal process. Sternum VIII enclosing base of elongate sternum IX; posteromesal process absent and posterior of segment semimembranous ( Fig. 30A, C ). Tergum IX without mesal ridge; posterior margin smoothly rounded; thinly sclerotized anteromesally ( Fig. 30B ); lateral ridge present; dorsal pleural setae approximately 20, ventral pleural setae approximately 10 ( Fig. 30A ). Preanal appendage less than 2/3 length of tergum X, of uniform diameter throughout length, setae long, but not filamentous or longer than appendage ( Fig. 30A, B ). Tergum X without basal lobes; basodorsal process absent; basolateral processes absent; apex, in lateral view, truncate, in dorsal view, entire or notched, notch shallow; with short dorsal projection at mid­length ( Fig. 30A, B ). Harpago slightly tapered; peglike setae few, apical ( Fig. 30A, C ). Phallic endotheca with paired apicolateral lobes and paired basolateral lobes, basolateral lobes large and round, apicolateral lobes small and tubercular; phallotremal sclerites small, longest dimension 1/2 diameter of phallobase; dorsal sclerite rectangular, width greater than height ( Fig. 30D, 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. 31C ). Tergum IX without mesal ridge ( Fig. 31B ). Sternum IX anterior and posterior lobes darkly sclerotized and striate, punctate, with patch of lightly sclerotized cuticle lateral to vaginal opening ( Fig. 31A ). Tergum X appendage shorter than mesal lobe, base indistinct, apex oblique; mesal lobe lightly sclerotized; digitate lateral processes absent ( Fig. 31B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 31A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite emarginate anteriorly, posterolateral projections rounded; posterior sclerite ovoid; posterior end of spermatheca membranous ( Fig. 31A ).

Material examined. BRAZIL: Parana: 164 km W Altamira, 9.xi.1974, Reinert — 1 female ( NMNH) ; 10.xi.1974, Reinert — 1 male ( NMNH) ; 12.xi.1974, Reinert — 1 female ( NMNH) ; 4­5 mi. W Jatobal , 22.x.1974, Reinert — 1 female ( NMNH) ; 24.x.1974, Reinert — 1 female ( NMNH) ; 28.x.1974, Reinert — 1 female ( NMNH) ; Rio Xingu , camp ca. 60 km S Altamira, 03°39'00”S, 52°22'00"W, 2.x.1986, Spangler & Flint — 2 males ( NMNH) ; 1st jungle stream trail 1, 03°39'00”S, 52°22'00"W, 2­8.x.1986, Spangler & Flint — 10 males, 12 females ( NMNH) ; — 1 male, 1 female ( UMSP) ; Igarape Jabuti , 03°39'00”S, 52°22'00"W, 8­16.x.1986, Spangler & Flint — 1 male, 4 females ( NMNH) ; Rondonia: Cacaulândia , 140 m, 1.xi.1994, Becker — 1 male ( NMNH) ; creek 8 km S of Cacaulandia , 21.xi.1991, Petr — 6 males, 7 females ( NMNH) ; GUYANA: Bartica, Dec, Parish — holotype male ( MCZ) ; SURINAME: Sipaliwini: Kabelebo River, Avanavero Vallen , 7.iv.1971, Geijskes — 1 male ( NMNH) ; 10.iv.1971, Geijskes — 1 male ( RNH) .

Distribution. Brazil, Guyana, Suriname.

Figures

FIGURE 30. Phylloicus brevior. Male (A­C, holotype; D­F, UMSP000005700): A—lateral view; B—dorsal view; C—ventral view; D—phallus, lateral view; E—phallotremal sclerites, dorsal view; F—terga III­IV, dorsal view.

FIGURE 31. Phylloicus brevior. Female (UMSP000005715): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.