Phylloicus cordatus, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 41-42

Phylloicus cordatus , new species

Figs. 36 , 37

This species is distinguished by the wing pattern, a distinctive pattern of orange and dark brown. In dorsal view, the brown patches on the posteromesal area are heart­shaped, and thus the name of this species. The abdominal coremata are short, broad, and single­lobed ( Fig. 36F ). The female specimen is teneral, so I was only able to measure wing length for the single male. The preanal appendages of this specimen are broken, but appear to be similar to those of P. elegans and hansoni , being covered with long fine setae and becoming slightly wider apically (as in Figs. 45B , 55B ).

Adult. Forewing length 8.4 mm, n = 2.

Head golden brown. Maxillary palps golden brown, covered with golden and dark brown setae. Antenna twice forewing length; each flagellomere golden proximally and dark brown distally, appearing striped. Dorsal pterothorax golden brown; ventrolateral thorax golden brown. Femora golden brown; foretibiae golden brown; mesotibiae dark brown; metatibiae chestnut brown; foretarsi golden brown; mesotarsi chestnut brown; metatarsi chestnut brown. Metathoracic leg of male with posterior fringe of long setae, setae chestnut brown. Tibial spur formula 2,4,4. Forewing flat; chestnut brown; with two transverse bands; proximal band orange, reaching posterior wing margin, at least 1/2 width of wing, wide, at least 1/6 wing length, 5­sided, most proximal corner in cell M 1, distal side runs from R 1 to A 1; distal band orange, beginning at anterior wing margin, at least 1/2 width of wing, with patch of brown setae in center of orange, each band with narrow border of dark brown setae.

Male. Preterminalic abdominal terga without anteromesal notches. Corematic structures present. Tergum IV with expanded lateral flanges, lateral coremata; lateral coremata accordion­pleated expansion of dorsal­pleural membrane. Tergum V without sclerotized modifications ( Fig. 36F ). 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; anterior ridge broken mesally ( Fig. 36B ); lateral ridge present; dorsal pleural setae continuous with ventral pleural setae, dense ( Fig. 36A ); sternum IX with faint mesolateral ridges; sternum IX ( Fig. 36C ). Preanal appendage widest apically, setae filamentous, longer than appendage ( Fig. 36A, B ). Tergum X without basal lobes; basodorsal process absent; basolateral processes absent; apex, in lateral view, acute, in dorsal view, notched, notch deep and round ( Fig. 36A, B ). Harpago slightly tapered; peglike setae absent ( Fig. 36A, C ). Phallic endotheca with paired apicolateral lobes and paired basolateral lobes, basolateral lobes multilobed, apicolateral lobes rounded and with digitate apical lobe; phallotremal sclerites very large, longest dimension twice diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 36D, E ).

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. 37C ). Tergum IX without mesal ridge, patch of several setae mesally ( Fig. 37B ). Sternum IX anterior and posterior lobes darkly sclerotized and striate, with patch of lightly sclerotized cuticle laterally ( Fig. 37A ). Tergum X appendage longer than mesal lobe, base distinct, apex triangular; mesal lobe lightly sclerotized; digitate lateral processes absent ( Fig. 37B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 37A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite truncate anteriorly, posterolateral projections rounded; posterior sclerite triangular ( Fig. 37A ).

Holotype male: VENEZUELA: Amazonas: Cerro de la Neblina, Camp IV, 00°58'00”N, 65°57'00"W, 760 m, 15­18.iii.1984, Flint ( NMNH).

Paratype: VENEZUELA: Amazonas: Cerro de la Neblina, Camp IV, 00°58'00”N, 65°57'00"W, 760 m, 15­18.iii.1984, Flint — 1 female ( NMNH) .

Distribution. Venezuela

Etymology. Cordatus, from the Latin, meaning “heart­shaped,” refers to the heart shape apparent when the folded wings are viewed dorsally.

Figures

FIGURE 36. Phylloicus cordatus. Male (holotype): A—lateral view; B—dorsal view; C—sternum IX, and inferior appendages, ventral view; D—phallus, lateral view; E—phallus, caudoventral view; F—segment IV, dorsal view.

FIGURE 37. Phylloicus cordatus. Female (UMSP000067626): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.

FIGURE 45. Phylloicus elektoros. Male (UMSP000067705): A—lateral view; B—dorsal view; C—sterna VIII, IX, and inferior appendages, ventral view; D—phallus, lateral view; E—phallus, ventral view.

FIGURE 55. Phylloicus hansoni. Male (holotype): A—lateral view; B—dorsal view; C—sterna VIII, IX, and inferior appendages, ventral view; D—phallus, lateral view; E—phallotremal sclerites, dorsal view; F—tergum IV, dorsal view.