Phylloicus mirabilis, Cavalcante & Dumas & Nessimian, 2018

Cavalcante, Bruna Maria Silva, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2018, Phylloicus mirabilis (Trichoptera: Calamoceratidae), a new species from Rio de Janeiro state, southeastern Brazil, Zootaxa 4370 (4), pp. 431-438 : 432-436

Phylloicus mirabilis , new species

Figs. 1–6

Diagnosis. Phylloicus mirabilis sp. nov. is unusual among species of the genus due to the lateral membranous lobes of abdominal segments IV–VII, the metathoracic tibiae with brushes of setae and an emargination in the distal portion, and wide, long coremata on abdominal pleura of segment VII. The male genitalia of the new species resemble those of P. monneorum by the shape of tergum X in dorsal view and the general shape of the inferior and preanal appendages in ventral and dorsal views, respectively. Nevertheless, Phylloicus mirabilis sp. nov. differs from P. monneorum in that P. mirabilis sp. nov. has a subtrapezoidal tergum X with beak-like apex, an obtuse apicoventral surface, and an acute basoventral surface as viewed laterally. Besides that, the new species has the harpago of each inferior appendage globose apically and the phallotremal sclerite is moustache-shaped in dorsal view, but in P. monneorum the harpago is cylindrical and the phallotremal sclerite horseshoe-shaped.

Description. Adult: Forewing length 7.4–8.6 mm (n = 3; holotype = 8.6 mm). Head and maxilary palps dark brown (in alcohol). Antennae light brown; scapes dark brown. Labial palps stramineous. Thorax dark brown, dorsum shiny. Femora golden brown; foretibiae and midtibiae golden brown; hind tibiae dark brown; fore- and midtarsi golden brown; hind tarsi dark brown. Wings dark brown, with white spots on hind wing membrane. Abdomen pale yellow. Head setal warts: anteromesal, paired anterior and posterolateral setal warts typical for genus; posterior setal warts elongate, oval, separated medially by longitudinal ridge. Thorax: pronotum short, with two pairs of setal warts, one prominent mesal and one lateral pair; mesoscutal setal warts typical for genus. Metathoracic legs with posterodorsal fringe of long, dark setae on proximal part and emargination on distal part of each tibia ( Fig. 1 ). Tibial spur formula 2,4,2. Forewings with venation typical for genus; forks I–V present in male; each forewing with discoidal cell less than half as long as thyridial cell; median cell closed ( Fig. 2A ). Hind wings each with basal brush present; forks II, III, and V present; with open discoidal and median cells ( Fig. 2B ). Male abdomen modified; segments IV–VII each with pair of pleural membranous lobes successively increasing in size toward apex, without sclerotized processes ( Figs. 3–5 ). Corematic structures present, arising from lateral lobes of segment VII; lateral coremata single-lobed, long, thick, without setae, capable of inflation surpassing genital apparatus ( Fig. 6 ). Abdominal terga unmodified, without posterior processes or sclerotized modifications ( Fig. 3 ). Sternum VII with short, acute anteromesal process. Sternum VIII enclosing base of elongate sternum IX ( Fig. 4 ).

Male genitalia. Preterminalic abdominal terga without anteromesal notches. Segment IX, in lateral view, with anterior ventrolateral margin produced and broadly rounded, posteroventral margin not produced, segment longitudinally shorter in dorsal half, posterior midlateral margin with truncated, indented surface bearing row of long setae ( Fig. 7A ); in dorsal view, with dorsomesal ridge more than half as long as segment, posterior margin slightly projected and obtuse, posteromesal surface covered with fine pilosity, posterior midlateral margins each with row of approximately 10 long dark setae, anterolateral margins pointed ( Fig. 7B ); sternum IX, in ventral view, elongated, with deeply U-shaped invagination on anterior margin, bordered by internal ridges ( Fig. 7C ). Preanal appendages about 3/4 as long as tergum X, subtriangular in dorsal and lateral views, compressed; dorsal and ventral margins irregularly scalloped, bearing dark, long setae ( Fig. 7A ). Tergum X in lateral view subtrapezoidal, taller than wide, with apex pointed and beak-like; basolateral and basodorsal processes absent; apicoventral margin obtuse beyond acute basoventral angle ( Fig. 7A ); in dorsal view, with deep mesal V-shaped notch, reaching almost half-length of segment X, covered with short setae ( Fig. 7B ); in ventral view, forceps-like ( Fig. 7D ). Inferior appendages long, each 2-segmented; coxopodite (first segment) long, cylindrical, bearing long, stout setae; harpago (second segment) short, cylindrical and about 1/3 as long as coxopodite, with short, fine setae, its apex globose and bearing peg-like setae ( Fig. 7C ). Phallic apparatus simple, tubular, slightly curved caudad at base; phallobase dorsally constricted near base, slightly widened before apex ( Fig. 7E ); phallotremal sclerite of average size, moustache-shaped in dorsal view ( Fig. 7F ).

Holotype male: BRAZIL: Rio de Janeiro: Rio de Janeiro, Parque Nacional da Tijuca, Trilha para o Bico do Papagaio , 22°56'58.0”S, 43°17'40.7”W, 16–31.viii. 2016, 776 m, L Silveira & B Clarkson leg. ( DZRJ) .

Paratypes: BRAZIL: Rio de Janeiro: Mangaratiba, Parque Estadual Cunhambebe, Sahy , Trilha Sahy , Rubião , 22°53’57.79”S, 43°59'15.41"W, 22.iv. 2016, 400 m, LS Babosa leg; 2 males ( DZRJ).

Distribution. Brazil (Rio de Janeiro).

Etymology. The specific epithet, mirabilis , from Latin, means wonderful, in allusion to the set of remarkable features that differentiate this new species.

Figures

FIGURES 7A–7F. Phylloicus mirabilis, new species, male genitalia: 7A, left lateral; 7B, dorsal; 7C, ventral; 7D, tergum X, ventral; 7E, phallic apparatus, left lateral; 7F, phallic apparatus, dorsal. pre. app. = preanal appendage (paired); inf. app. = inferior appendage (paired); pha.scl = phallotremal sclerite; s. IX = sternum IX; t. X = tergum X.

FIGURES 1, 2A–2B. Phylloicus mirabilis, new species, holotype. 1, Male left hind leg, anteroventral; 2, right wings, dorsal: 2A, forewing; 2B, hind wing.

FIGURES 3–6. Phylloicus mirabilis, new species, paratype, male abdomen: 3, dorsal; 4, ventral; 5, left ventrolateral; 6, ventral, with expanded coremata.