Phylloicus obliquus Navás, 1931

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 79-80

Phylloicus obliquus Navás

Figs. 78 , 79

Phylloicus obliquus Navás, 1931:458 [Type locality: Brazil, Minas Gerais; DEI, female].

Phylloicus obliquus is very similar to P. bidigitatus and plaumanni (see discussion under bidigitatus ), but differs in the wing pattern and the shape of male tergum X ( Fig. 78A, B ). Adult. Forewing length 8.9­9.7 mm, n = 4.

Head golden brown, with dorsomesal crest of black setae. Maxillary palps golden, covered with dark brown setae. Antenna twice forewing length; chestnut brown. Dorsal pterothorax chestnut brown; ventrolateral thorax golden brown. Femora golden brown; foretibiae golden brown; mesotibiae dark brown; metatibiae dark brown; foretarsi golden brown; mesotarsi golden brown; metatarsi dark brown. Metathoracic leg of male without posterior fringe. 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; distal band white, not reaching either wing margin, 1/2 width of wing or less; with single basal stripe, ivory. Hind wing basal brush absent.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures absent, terga III­V unmodified, without membranous lobes or sclerotized processes. Sternum VII with short, acute anteromesal process. Sternum VIII similar to anterior sterna, sternum IX not elongate. Tergum IX with short mesal ridge extending from anterior notch; posterior margin not distinct from base of tergum X ( Fig. 78B ); lateral ridge present; dorsal pleural setae approximately 10, ventral pleural setae absent ( Fig. 78A ); sternum IX with paired mesolateral ridges; sternum IX ( Fig. 78C ). Preanal appendage shorter than tergum X, but greater than 2/3 length, narrowly elliptic, setae long, but not filamentous or longer than appendage ( Fig. 78A, B ). Tergum X without basal lobes; basodorsal process absent; basolateral processes absent; apex, in lateral view, rounded, in dorsal view, notched, notch deep and round; dorsal surface covered with short setae ( Fig. 78A, B ). Harpago sharply tapered; peglike setae few, apical ( Fig. 78A, C ). Phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 78D ).

Female. Preterminal abdominal terga without anteromesal notches. Sternum VII with short pointed anteromesal process. Tergum VIII without posterolateral brush; sternum VIII cleft posteromesally to anterior ridge; sternum VIII ( Fig. 79C ). Tergum IX without mesal ridge ( Fig. 79B ). Sternum IX anterior lobes smooth and indistinct, posterior lobes striate, without distinct area of thin cuticle or invagination ( Fig. 79A ). Tergum X appendage longer than mesal lobe, base indistinct, apex triangular; mesal lobe lightly sclerotized; digitate lateral processes length approximately equal diameter and often asymmetrical ( Fig. 79B ). Sternum X without setae in membrane ( Fig. 79A ). Vaginal apparatus posterior sclerite elongate; anterior sclerite tapered anteriorly, posterolateral projections absent; posterior sclerite triangular; posterior end of spermatheca a tiny sclerotized sphere ( Fig. 79A ).

Material examined. BRAZIL: Minas Gerais: 1.v.1924, Le Moult — holotype female ( DEI) ; Rio de Janeiro: Parque Nac. Tijuca, Jacarepaguá, Floresta da Tijuca , Represa dos Ciganos, 400 m, 7.iv.1977, C & O Flint — 1 female ( NMNH) ; Santa Catarina: Parque Ecológica Spitzkopf, confl. Rio Ouro & Rio Caeté , 27°00'21”S, 49°06'42"W, 140 m, 3.iii.1998, Holzenthal, Froehlich, & Paprocki — 1 female ( UMSP) ; Rio Caeté above 1st falls, 27°00'21”S, 49°06'42"W, 170 m, 4.iii.1998, Holzenthal, Froehlich, & Paprocki — 1 male, 1 female ( UMSP) .

Distribution. Brazil.

Figures

FIGURE 78. Phylloicus obliquus. Male (UMSP000068257): A—lateral view; B—dorsal view; C—sternum IX and inferior appendages, ventral view; D—phallus, lateral view; E—phallotremal sclerites, dorsal view.

FIGURE 79. Phylloicus obliquus. Female (holotype): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.