Phylloicus ephippium, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 50-51

Phylloicus ephippium , new species

Figs. 47 , 48

Phylloicus ephippium is distinguished by the wing pattern, which in dorsal view appears to have a saddle of dark brown across the middle of the wing, and segments IV and V of the male, which are highly modified ( Fig. 47F ), with a long, projecting lateral sclerite of tergum IV. Only mesal coremata are present; these are bifurcate and setose.

Adult. Forewing length 12.1 mm, n = 6.

Head golden brown, with dorsomesal crest of black setae. Maxillary palps dark brown. Antenna twice forewing length; dark brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Dorsal pterothorax dark brown; ventrolateral thorax pale tan. Legs pale tan. Metathoracic leg of male with posterior fringe of long setae, setae pale. Tibial spur formula 2,4,4. Forewing flat; chestnut brown; with two transverse bands; proximal band golden, reaching posterior wing margin, at least 1/2 width of wing, an inverted V­shape; distal band tan, not reaching either wing margin, 1/2 width of wing or less; with two basal stripes, golden; "V" of proximal band encloses “S,addle” of dark brown setae on posterior margin; proximal half of cell Cu 2 clear. Hind wing basal brush present in male, dark brown.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures present. Tergum IV with paired lateral sclerites, mesal coremata; lateral sclerite contorted, setose apically; mesal coremata bilobed, mesal lobe setose, capable of inflation to 1/2 length segment V, lateral lobe very long, fully extended reaching to end of abdomen, covered with setae. Tergum V with pair of semi­elliptical ridges on posteromesal corners ( Fig. 47F ). Sternum VII without anteromesal process. Sternum VIII enclosing base of elongate sternum IX; posteromesal process truncate ( Fig. 47A, C ). Tergum IX without mesal ridge; posterior margin with round narrow mesal projection; with anterior ridge broken mesally; posterior margin with smooth rounded mesal projection ( Fig. 47B ); lateral ridge present; dorsal pleural setae approximately 8, ventral pleural setae approximately 5 ( Fig. 47A ). Preanal appendage approximately length of tergum X, of uniform diameter throughout length, setae long, but not filamentous or longer than appendage ( Fig. 47A, B ). Tergum X without basal lobes; basodorsal process long and digitate; basolateral processes absent; apex, in lateral view, rounded, in dorsal view, notched, notch triangular ( Fig. 47A, B ). Harpago rounded; peglike setae few, apical ( Fig. 47A, C ). Phallic endotheca with paired basolateral lobes, basolateral lobes large and round; phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 47D, E ).

Female. Preterminal abdominal terga with anteromesal notch. Sternum VII without anteromesal process. Tergum VIII without posterolateral brush; sternum VIII with shallow posteromesal notch; sternum VIII ( Fig. 48C ). Tergum IX with very short mesal ridge ( Fig. 48B ). Sternum IX anterior lobes darkly sclerotized and striate, posterior lobes smooth, without distinct area of thin cuticle or invagination ( Fig. 48A ). Tergum X appendage shorter than mesal lobe, base marked by faint suture line, apex oblique; mesal lobe lightly sclerotized; digitate lateral processes length approximately equal diameter ( Fig. 48B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 48A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite truncate anteriorly, posterolateral projections acute; posterior sclerite triangular; posterior end of spermatheca a sclerotized expanded tube ( Fig. 48A ).

Holotype male: ECUADOR: Tungurahua: 13 km E Baños , 1550 m, 15.ix.1990, Flint ( NMNH).

Paratypes: ECUADOR: Tungurahua: 13 km E Baños, 1550 m, 15.ix.1990, Flint — 1 female, 3 males ( NMNH); 1 male ( UMSP) .

Distribution. Ecuador.

Etymology. Ephippium, from the Latin, meaning “Saddle,” referring to saddle pattern of the forewings.

Figures

FIGURE 47. Phylloicus ephippium. Male (holotype): 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 IV and V, dorsal view.

FIGURE 48. Phylloicus ephippium. Female (UMSP000010125): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.