Phylloicus passulatus, Prather, 2003

PRATHER, AYSHA L., 2003, Revision of the Neotropical caddisfly genus Phylloicus (Trichoptera: Calamoceratidae), Zootaxa 275 (1), pp. 1-214 : 83-84

Phylloicus passulatus , new species

Figs. 84 , 85

Phylloicus passulatus is easily distinguished by the morphology of abdominal segment IV. The long posterior processes of tergite IV, and the rugose, sclerotized lobe of the lateral corema are distinctive to this species. None of the male specimens had the phallic endotheca fully everted, so I am unable to describe the membranous lobes.

Adult. Forewing length 10.7 mm, n = 3.

Head dark brown, with golden setae. Maxillary palps dark brown. Antenna twice forewing length; dark brown, with narrow patches of pale sensilla on anteromesal surface of each flagellomere. Prothorax golden, with golden setae; dorsal pterothorax golden brown; ventrolateral thorax golden brown. Femora golden brown; tibiae dark brown; tarsi dark brown. Metathoracic leg of male with posterior fringe of long setae. Tibial spur formula 2,4,4. Forewing flat; dark brown; with two transverse bands; proximal band ivory, not reaching either wing margin, 1/2 width of wing or less; distal band ivory, sparse; with two basal stripes, ivory. Hind wing basal brush present in male, dark brown.

Male. Preterminalic abdominal terga with anteromesal notch. Corematic structures present. Tergum IV with paired posterior processes and paired lateral sclerites, mesal coremata and lateral coremata; posterior process truncate; lateral sclerite spatulate, directed laterally; lateral coremata with basal globose lobes and most dorsal lobe sclerotized; mesal coremata single­lobed, apparently not eversible, apically truncate. Tergum V without sclerotized modifications ( Fig. 84F ). Sternum VII with short, acute anteromesal process. Sternum VIII enclosing base of elongate sternum IX; posteromesal process absent and posterior of segment semimembranous ( Fig. 84A, C ). Tergum IX with short mesal ridge extending from anterior notch; posterior margin obtuse ( Fig. 84B ); lateral ridge present; dorsal pleural setae approximately 10, ventral pleural setae approximately 3 ( Fig. 84A ). Preanal appendage shorter than tergum X, but greater than 2/3 length, of uniform diameter throughout length, setae long, but not filamentous or longer than appendage ( Fig. 84A, B ). Tergum X without basal lobes; basodorsal process short and digitate; basolateral processes absent; apex, in lateral view, acute, in dorsal view, notched, notch shallow ( Fig. 84A, B ). Harpago rounded; peglike setae tiny, mesal ( Fig. 84A, C ). Phallotremal sclerites average size, longest dimension less than diameter of phallobase; dorsal sclerite ovoid, in dorsal view horseshoe­shaped ( Fig. 84D, E ).

Female. Preterminal abdominal terga with anteromesal notch. Sternum VII with short pointed anteromesal process. Tergum VIII without posterolateral brush; sternum VIII with shallow posteromesal notch; sternum VIII ( Fig. 85C ). Tergum IX without mesal ridge ( Fig. 85B ). Sternum IX anterior and posterior lobes darkly sclerotized and striate, punctate, with patch of lightly sclerotized cuticle laterally ( Fig. 85A ). Tergum X appendage shorter than mesal lobe, base indistinct, apex oblique; mesal lobe lightly sclerotized; digitate lateral processes absent ( Fig. 85B ). Sternum X with patches of short fine setae posterolaterally to anal opening ( Fig. 85A ). Vaginal apparatus anterior and posterior sclerites equal in length; anterior sclerite truncate anteriorly, posterolateral projections rounded; posterior sclerite ovoid ( Fig. 85A ).

Holotype male: VENEZUELA: Amazonas: Puerto Ayacucho (40 km S) El Tobogán, Caño Coromoto, 24.i.1989, Spangler, Faitoute, & Barr ( NMNH).

Paratypes: VENEZUELA: Amazonas: Puerto Ayacucho (40 km S) El Tobogán, Caño Coromoto , 24.i.1989, Spangler, Faitoute, & Barr — 1 female ( NMNH) ; Cerro de la Neblina, Agua Blanca , 00°49'00”N, 66°08'00"W, 160 m, 20­21.iii.1984, Flint & Louton — 1 male ( IZAM) ; — 1 male ( NMNH) .

Distribution. Venezuela

Etymology. Passulatus, from the Latin passula, “raisin,” and latus “carry or bear,” for the sclerotized lobe of the coremata, which resembles a raisin.

Figures

FIGURE 84. Phylloicus passulatus. Male (UMSP000068255): 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.

FIGURE 85. Phylloicus passulatus. Female (UMSP000068252): A—sterna IX, X and vaginal apparatus, ventral view; B—terga IX and X, dorsal view; C—sternum VIII, ventral view.