Marilia manicorei, Camargos & Pes & Hamada, 2020

Camargos, Lucas M., Pes, Ana Maria & Hamada, Neusa, 2020, New Neotropical species of Marilia Müller (Trichoptera: Odontoceridae), Zootaxa 4853 (1), pp. 1-41: 19-24

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Marilia manicorei

sp. nov.

Marilia manicorei   sp. nov.

( Figs 13–17 View FIGURE 13 View FIGURE 14 View FIGURE 15 View FIGURE 16 View FIGURE 17 , 29 View FIGURE 29 )

Diagnosis: Marilia manicorei   sp. nov. has male genitalia similar to those of M. triangularis Flint 1983   by the shape of the preanal and inferior appendages strongly curved, as well as lateral sutures of segment IX forming lateral triangular plates on the segment. However, the shape of segment X in dorsal view differentiates the two species, being arrow-like in M. manicorei   sp. nov. and columnar in M. triangularis   , and in lateral view, the segment is irregularly slender in the new species and triangular in the other one.

The larva is similar to that of M. cunhaporanga   sp. nov., mainly in the pigmentation pattern of the head, with brown curved lines on the frontoclypeal suture. However, M. manicorei   sp. nov. does not have spots on the pronotum, and the cuticle of the abdomen is uniformly colored, while the other species has dark spots on pro- and mesonota and a light abdomen with remarkable dark spots.

Adult: Male forewings each 5.6–6.41 mm long (n = 7). Body and forewings with pale gray areas covered with gray setae in alcohol, and gray with small dark spots in pinned specimens.

Head: Eyes large in males, interocular distance about half width of one eye ( Figs 14a, b View FIGURE 14 ). Pair of distinct vertexal mediantennal compact setose warts, each with kidney-shaped form; pair of vertexal lateroantennal warts small, elliptical; pair of occiptal warts and pair of posterior warts fused and long. Antennae long, about two times length of body, with narrow annuli; scapes broad, brown, each with large J-shaped pale area basodorsally and dorsolaterally, covered with light setae. Front pubescent, covered with light setae, pair of frontogenal warts short and kidneyshaped ( Figs 14c, 14d View FIGURE 14 ). Maxillary palps well developed, each 5-articulated, heavily covered with setae. Labial palpi each 3-articulated, articles subequal, covered with setae.

Thorax: Prothorax less than half as long as head; pronotum with pair of transversely elongate setal warts. Mesothorax broad, mesonotum without setae and with median longitudinal dark line reaching mesoscutellum, mesoscutellum almost circular and with pair of setal warts and small posterior depressions. Metathorax half as long as mesothorax, without setae. Tibial spur formula 2-4-2; external spurs of median and posterior tibiae shorter than internal spurs. Forewings each with R2 curved anterad and fused with R1 before margin, fork I arising near midlength of discoidal cell ( Fig 15a View FIGURE 15 ). Hind wings each with fork I arising on apical eighth of discoidal cell, SC and R1 merging at 2/3 their length, and R2 ending on wing margin independently; anal lobe with brush-like tuft of long setae ( Fig 15b View FIGURE 15 ).

Abdomen: Simple, without differentiated structures.

Male genitalia: Segment IX, in lateral view with anterior margin convex and posterior margin slightly projected below midheight; midlateral sutures separating each side of segment IX into 5 parts ( Fig 16a View FIGURE 16 ); ventral part occupying almost half of height of segment IX, small subtriangular part ventrolaterally at anterior convexity, smaller triangular part partially delineated posterolaterally ( Fig 16c View FIGURE 16 ); dorsal part taller than half of height of segment IX, not projecting above segment X ( Fig 16b View FIGURE 16 ). Preanal appendages, in lateral view, short, slender, with apex slightly rounded ( Fig 16a View FIGURE 16 ); claviform in dorsal view, with numerous setae and base narrower than apex ( Fig 16b View FIGURE 16 ). Segment X with apex convex in lateral view ( Fig 16a View FIGURE 16 ); subquadrate, slightly broader at base, apex arrow-like and with deep apicomesal notch in dorsal view ( Fig 16b View FIGURE 16 ). Inferior appendages each with two articles: Basal article cylindrical with base broader than apex, curved mesad; apical article short with small conical spines apically; with internal margin slightly concave in ventral view ( Fig 16c View FIGURE 16 ). Phallus tubular curved nearly 90 near base in lateral view ( Fig 16d View FIGURE 16 ), straight in ventral view ( Fig 16e View FIGURE 16 ); endotheca membranous, with small conical spines; phallotremal sclerite hookshaped in lateral view ( Fig 16d View FIGURE 16 ), with one point on each end of oval disk in ventral view ( Fig 16e View FIGURE 16 ).

Final Instar Larva: Body length 5.1–5.9 mm (n = 2). Background color of sclerites yellow and abdomen light gray in alcohol ( Fig 17a View FIGURE 17 ).

Head: In dorsal view, subrectangular or nearly oval, light yellow with slightly distinguishable carinae extending from eyes to juncture of sutures and distinctive brown U-shaped lines mesal of carinae and lateral of frontoclypeal sutures and along short coronal suture, frontoclypeus with sinuous submesal lines ( Fig 17c View FIGURE 17 ); in ventral view with pair of parallel dark longitudinal lines, ventral apotome 3.5 times as long as broad and separating genae entirely ( Fig 17d View FIGURE 17 ). Eyes not clearly rimmed by light areas ( Fig 17e View FIGURE 17 ). Labrum with concave apical margin as broad as concave basal margin, sides evenly rounded, posterolateral edges extended posterad; setae 2 and 3 each robust, with row of smaller marginal setae between them, with setae 3, 4, 5, 6 straight and of less rigid thickness ( Fig 17f View FIGURE 17 ). Mandibles robust, asymmetrical, left mandible with smaller mesal tooth farther from apex than on right mandible ( Fig 17g View FIGURE 17 ).

Thorax: Pronotum yellow, with setae on anterolateral corners, anterior margin almost straight, black median longitudinal line reaching posterior margin, without other spots. Mesonotum with each mesonotal plate divided in 3 sclerites: On each side anteromesal sclerite (sa 1) yellow without other spots and with setae mostly anterior; posteromesal sclerite (sa 2) yellow with dark area on posterior margin occupying about one-fifth of sclerite and setae mostly anterior; lateral sclerite (sa 3) brown with many setae near anterior margin. Metanotum divided into 5 brown sclerites: Anteromesal pair of sclerites (sa 1) with setae on anterior margins; lateral pair of sclerites (sa 3) each with setae on anterior and lateral margins and with dark area on posterior margin; posteromesal sclerite (fused sclerites of sa 2) transversely long, straight, with few lateral setae ( Fig 17b View FIGURE 17 ). Legs yellow.

Abdomen: Abdominal gill formula as in Fig 13 View FIGURE 13 . Tergite IX subtriangular. Anal prolegs without teeth on external margins of claws.

Pupa: Body length 5.5 mm (n = 1). Body brown in alcohol.

Head: Mandibles long, more than three times as long as wide, distal portion narrowed then extended as fine, attenuated, sclerotized filament, serrate on entire internal margin. Labrum subquadrate, with lateral angles rounded ( Fig 17h View FIGURE 17 ).

Thorax: Mesotarsi each with fringe of long setae.

Abdomen: Segments III–VII each with pair of small oval anterior hook plates, each hook plate with one hook oriented posterad; segment V with pair of triangular posterior hook plates, each hook plate with 2 posterior hooks oriented anterad ( Fig 17i View FIGURE 17 ). Terminal processes long, slender, and divergent from base ( Fig 17j View FIGURE 17 ).

Case: Length 4.8–5.9 mm (n = 2), composed of various sizes of grains of coarse sand, slightly curved, slightly broadening from posterior to anterior ( Fig 17k View FIGURE 17 ).

Etymology: The specific epithet is in honor of the late Valdenor Toscano Feio, known as “Manicoré” because of his friendship and pleasant conversations about life in the Central Amazon and his exceptional cooking skills, turning our field work in Presidente Figueiredo County a great joy.

Bionomics: This species was found mainly in streams with widths of 5 to 20 m, depths of 0.15 to 2.0 m, and rocky bottoms. The larvae forage in pools with sand and rocks, along with M. cabloca   sp. nov.

Comments: It was also observed that pupal exuviae of emerged adults had no apical attenuated extensions on the mandibles ( Fig 16h View FIGURE 16 ), possibly having been broken as the insect opened its case.

Distribution: BRAZIL: Amazonas; VENEZUELA: Bolívar.

Holotype male: BRAZIL, Amazonas , Presidente Figueiredo : Pousada Sossego da Pantera, Igarapé da Onça, 02°00’52”S 60°01’43”W, 20–21.x.2007, J.L.D. Albino leg., Pennsylvania light trap [alcohol] ( INPA-TRI 000074). GoogleMaps  

Paratypes: BRAZIL, Amazonas, Presidente Figueiredo: Pousada Sossego da Pantera, Igarapé da Onça   , 02°00’52”S 60°01’43”W, 22.ii.2000 A.M.O. Pes leg., light trap, 1 male [pinned] ( DZRJ) GoogleMaps   ; 26–28.ix.2000, A.M.O. Pes leg., light trap, 2 males [pinned] ( INPA-TRI 000075)   ; 08–11.x.2002 A.M.O. Pes leg., light trap, 1 male [pinned] ( INPA-TRI 000076)   , 1 male [pinned] ( UMSP)   ; 03–04.iv.2000, 2 larvae; 03.v.2000, 2 larvae [alcohol] ( INPA-TRI 000077)   ;, 1 larva [alcohol] ( DZRJ)   ; 02.viii.2000, 1 larva [alcohol], ( INPA-TRI 000078)   ; 05.ix.2000, 2 pupae (1 pharate male) [alcohol] ( INPA-TRI 000079)   ; Igarapé do Ramal do km 24, na prop. do sr. José Souza, 02°101’07”S 59°49’28”W, 06.ix.2000, 1 larva [alcohol] ( INPA-TRI 000080)   ; rio Urubu, acima da Cachoeira da Iracema   , 01°59’10”S 60°03’44”W, 29.ix.2000, 1 larva [alcohol] ( INPA-TRI 000081) GoogleMaps   ; Igarapé das Lages, Seu Nezinho, km 109 BR 174, 01°59’38”S 60°01’40”W, 24.ii.2000, A.M.O. Pes, Y. Alencar, U. Barbosa, J. Bosco, leg., 1 larva [alcohol] ( MZSP) GoogleMaps   . VENEZUELA, Bolívar: Parque Nacional Canaima, Gran Sabana, Rio Kavanaien #3; 05°37’27.0”N 61°44’37.0”W, 20.xi.2005, A.M.O. Pes, N. Hamada, C. Azevedo, M.E. Grillet, E. Guerrero, light trap, 2 males [alcohol] ( INPA-TRI 000082) GoogleMaps   .


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Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo