Phylloicus llaviuco, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 65-66

Phylloicus llaviuco , new species

Fig. 63

This species is known only from a single male, with broken antennae and wings badly rubbed. Thus, wing ornamentation and antennal length are incompletely known. The phallic endotheca is not fully everted, so I am unable to describe the membranous lobes. This species is similar in size and wing coloration to P. magnus ; however, the male genitalia are distinctly different. Phylloicus llaviuco is distinguished by the long digitate basodorsal process of tergum X, and the absence of abdominal coremata.

Adult. Forewing length 16.2 mm, n = 1.

Head chestnut brown, with dorsomesal crest of dark brown setae. Maxillary palps golden brown, covered with dark brown setae. Antenna dark brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Dorsal pterothorax chestnut brown; ventrolateral thorax golden brown. Legs golden brown. Metathoracic leg of male with posterior fringe of long setae, setae pale. Tibial spur formula 2,4,4. Forewing flat; dark brown; with color patches; with golden setae at chord, in patch distal to crossvein Cu, and marking vein A 3; with small golden spots marking nygma and thyridium. Hind wing basal brush present in male, dark brown.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures absent, terga III­V unmodified, without membranous lobes or sclerotized processes. Sternum VII without anteromesal process. Sternum VIII enclosing base of elongate sternum IX, or similar to anterior sterna, sternum IX not elongate; posteromesal process absent and posterior of segment semimembranous ( Fig. 63A, C ). Tergum IX with mesal ridge extending full length of segment; posterior margin with round narrow mesal projection ( Fig. 63B ); lateral ridge present; dorsal pleural setae absent, ventral pleural setae approximately 15 ( Fig. 63A ); sternum IX ( Fig. 63C ). Preanal appendage shorter than tergum X, but greater than 2/3 length, widest near base, setae long, but not filamentous or longer than appendage ( Fig. 63A, B ). Tergum X without basal lobes; basodorsal process long and digitate; basolateral processes absent; apex, in lateral view, truncate, in dorsal view, entire ( Fig. 63A, B ). Harpago rounded; peglike setae few, apical ( Fig. 63A, C ). Phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 63D, E ).

Female. Unknown.

Holotype male: ECUADOR: Azuay: Río Llaviuco , 16 km W Quenca, 3010 m, 18.ix.1990, Flint ( NMNH).

Distribution. Ecuador.

Etymology. Named for the Río Llaviuco, where this species was collected.

Figures

FIGURE 63. Phylloicus llaviuco. Male (holotype): A—lateral view; B—dorsal view; C—ventral view; D—phallus, lateral view.