Marilia cabocla Camargos & Pes & Hamada 2020, sp. nov.
Creators: name: Camargos, Lucas M.
name: Pes, Ana Maria
name: Hamada, Neusa
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Odontoceridae
Marilia
Marilia cabocla

description: Marilia cabocla sp. nov.
(Figs 1–5, 29)
Diagnosis: Marilia cabocla sp. nov. resembles M. infundibulum Flint 1983, M. misionensis Flint 1983, and M. gigas Flint 1991 by having segment X apex arrow shaped, segment IX divided into 3 parts in the pleural region, and the inferior appendages with the internal margins slightly curved. However, the 2-4-4 tibial spur formula of M. cabocla sp. nov. differs from that of M. infundibulum, which is 2-4-2. The phallotremal sclerite is similar to that of M. misionensis, but M. cabloca sp. nov. differs from it in that the apical portion of segment X is sclerotized instead of membranous and each preanal appendage has a broad base in dorsal view instead of having the base narrower than the apex. The male eyes are slightly separated in M. cabocla sp. nov., with the interocular distance narrower than the width of an eye but are contiguous in M. misionensis. The shape of the phallotremal sclerite differentiates the new species from M. gigas, since the latter does not have a posterior branch of the sclerite while that of M. cabocla has one.
The dark pigmented pattern of the larval head is similar to that of the Australian species M. fusca Kimmins 1953 (in Mosely & Kimmins 1953) and to the Brazilian species M. caipira sp. nov., resembling the letter Y along the frontoclypeal and coronal sutures. In the new species, the dark head stripes are straight instead of sinuous, which distinguishes it from the Australian species. Also, the length of the posterior sclerite of the metanotum is long in the new Amazonian species and short in M. fusca. The main differences between M. cabocla sp. nov. and M. caipira sp. nov. are in the pigmentation patterns of the thorax and legs, which are completely yellow in M. cabloca sp. nov. versus yellow with black tibiae and tarsi in M. caipira sp. nov.
Adult: Male forewings each 8.1–9.5 mm long (n = 19). Body and forewings brown, forewings with pale gray areas covered with gray setae in alcohol, and gray with small dark spots in pinned specimens.
Head: Eyes very large in males, interocular distance about one-third width of eye (Fig 1a). Pair of vertexal mediantennal compact setose warts, fused with rounded form; par of vertexal lateroantennal warts, small subtriangular; pair of occiptal warts, well developed, modified into pair of narrow strips nearly half as long as vertex (Figs 1a, 1b). Antennae long, about two times as long as body, with narrow annuli; each with scape broad, especially apically, pale basodorsally and laterally, covered with light setae. Front pubescent, covered with light setae, pair of frontogenal warts small and kidney-shaped (Fig 1c). Maxillary palps well developed, each 5-articulated, heavily covered with setae. Labial palps each 3-articulated, 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, 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 2-4-4; external spurs of median and posterior tibiae shorter than internal spurs. Forewings each with apical fork I arising on apical third of discoidal cell, R1 abruptly curved posterad and fused with R2 near wing margin (Fig 2a). Hind wings each with apical fork I arising on apical quarter of discoidal cell, R1 fused with either SC or R2 and indistinguishable from them, these three veins merging before wing margin; anal lobe with brush-like tuft of long setae (Fig 2b).
Abdomen: Simple, without differentiated structures.
Male genitalia: Segment IX, in lateral view with anterior margin nearly straight and posterior margin slightly projected posterad at midheight; mid lateral sutures separating each side of segment IX into 3 parts, median plate extending across anterior region of ventral plate, ventral plate occupying more than one-third of segment IX height (Fig 3a); segment IX not projected dorsally over segment X (Fig 3a). Preanal appendages, in lateral view, short, each tapering to blunt apex (Fig 3a); claviform in dorsal view, with numerous setae and base broader than apex (Fig 3b). Segment X subtriangular, with apex truncate in lateral view (Fig 3a); dorsally subrectangular, broader at base, apex arrow-like, with median notch (Fig 3b). Inferior appendages each with two articles; basal article cylindrical, with base slightly broader than apex, slightly curved mesad; apical article short, with small conical spines apically; in ventral view clavate (Fig 3c). Phallus tubular, in lateral view angled about 45 at one-third length (Fig 3d), in ventral view straight (Fig 3e); endotheca membranous, with small conical spines; phallotremal sclerite C-like in lateral view (Fig 3d) and Y-like in ventral view (Fig 3e), with anterior branch.
Final Instar Larva: Body length 6.4–7.9 mm (n = 7). Body sclerites yellow and abdomen light brown in alcohol (Fig 4a).
Head: In dorsal view subrectangular, yellow, with distinctively narrow black Y-shaped lines along frontoclypeal and short coronal sutures, slightly distinguishable carinae extending from eyes to juncture of sutures (Figs 4b, 4c); in ventral view with pair of longitudinal black lines, ventral apotome more than 5 times longer than broad and tapering to posterior apex, separating genae entirely (Fig 4d). Eyes rimmed by light areas (Fig 4e). Labrum with slightly concave apical margin and convex apicolateral margins both broader than respective concave basal and convex basolateral margins; setae 1 and 2 on each side robust, with row of smaller apical setae between them and with setae 3, 4, 5, 6 straight and of less rigid thickness (Fig 4f). Mandibles robust, asymmetrical, right mandible with rounded mesal tooth at midlength, left mandible with pointed mesal tooth closer to apex (Fig 4g).
Thorax: Pronotum yellow, with setae on anterolateral corner, anterior margin slightly concave, with black transverse line and black median longitudinal line reaching posterior margin, without any other pigmentation (Fig 4b). Mesonotum divided into 3 pairs of sclerites: Anteromesal pair (setal area 1, or sa 1) yellow, without pigmentation other than some clear spots, and with setae mostly adjacent to anterior margins; posteromesal pair (sa 2) brown, with dark narrow area on posterior margins and setae mostly adjacent to anterior margins; lateral pair (sa 3) yellow, with many setae (sa 3) anteriorly (Fig 4b). Metanotum divided into five pairs of dark, yellow sclerites: Anteromesal pair (sa 1) close to each other and with setae on anterior margins; lateral pair (sa 3) with setae on anterior and lateral regions; single transverse posteromesal sclerite (fused pair of sa 2 sclerites) broadly elongate, straight, with few setae laterally (Fig 4b). Legs yellow.
Abdomen: Abdominal gill formula as in Fig 5. Tergite IX subtriangular. Anal prolegs without teeth on external margin of claw.
Pupa: Body length 8.6–10.9 mm (n = 9). Body brown in alcohol.
Head: Mandibles more than three times longer than wide, each with distal portion strongly tapered, serrate along entire internal margin. Labrum subquadrate, with lateral angles rounded (Fig 4h).
Thorax: Mesotarsi each with fringe of long setae.
Abdomen: Segments III–VII with small oval anterior hook plates, each with one hook oriented posterad; segment V with 2 triangular posterior hook plates, each with 2 posterior hooks directed anterad (Fig 4i). Terminal processes long, slender, and divergent from base (Fig 4j).
Case: Length 6.9–10.0 mm (n = 11); made from coarse sand grains, hard, strongly resisting crushing, slightly curved, tubular with equal diameter along length (Fig 4k).
Etymology: The name is a noun in apposition in honor of the people living along the Amazon River, often called “caboclo” in Brazilian Portuguese, with the singular feminine form spelled “cabocla.” The term is currently used as an expression of pride because it refers to a strong woman adapted to survive in the difficult reality of the Amazon, which well represents this species that is well adapted to the streams of the Amazon Basin.
Bionomics: This species is common in the Central Amazon, where it is found among riparian vegetation roots, macrophytes, rocky margins, and logs, in small to medium forest streams. In Pará state, it was collected in one stream flowing through the savannah. Specimens of Marilia cabocla sp. nov. were collected in streams from 0.5 to 50 m wide with acidic water (pH 5.5 to 6.5).
Distribution: BRAZIL: Amazonas, Pará (Fig 29).
Holotype male: BRAZIL, Amazonas, Manaus: Reserva Ducke, Igarapé Barro Branco, 02°55’46.7”S 59° 58’22.00”W, 31.v.2011, A.M.O. Pes leg., with pupal exuviae [alcohol] (INPA-TRI 000096).
Paratypes: BRAZIL, Amazonas, Manaus: same data as holotype, except 13–16.xi.2000, J. Vidal leg. Malaise trap, 1 male [pinned] (UMSP); 22–28.xii.2000, J. Vidal leg. Malaise trap, 1 male [alcohol] (INPA-TRI 000097); 08.ix.2003, S.P. Bentes leg., l male and its pupal exuviae [alcohol] (INPA-TRI 000098); 29.vii.2010. C.B. de Souza leg., light trap, l male [alcohol](INPA-TRI 000099); IgarapéAfluente 22do Ig.Acará, 02°56’05”S 59°57’16”W, 20-21.i.2002, A.M.O. Pes leg., l male and its pupal exuviae [alcohol] (INPA-TRI 000046); 03.viii.2010, J.O. da Silva leg., 2 larvae and 2 pupae [alcohol] (INPA-TRI 000047). Presidente Figueiredo: Igarapé do Sr. José Souza, Ramal do km 24, AM 240, 02°01’06”S 59°49’27”W, 21–24.ii.2000. A.M.O. Pes, Y. Alencar, U. Barbosa leg., light trap (UV), 2 males [alcohol] (MZSP); 22–24.ii.2000, Malaise trap, 1 male [pinned] (INPA-TRI 000048); 24.ii– 02.iii.2000, Malaise trap, 1 male [pinned] (INPA-TRI 000049); 03–05.iv.2000, A.M.O. Pes, J.O. da Silva leg., 10 males [alcohol] (INPA-TRI 000050); 31.v.2000, 5 males [alcohol] (INPA-TRI 000051); 03–04.vii.2000, 1 male [alcohol] (INPA-TRI 000052); emerged 11.viii.2000 A.M.O. Pes, J.O. da Silva, J. Bosco leg., 1 male [pinned] and its pupal exuviae [alcohol] (INPA-TRI 000053); 24–25.xi.2000, 3 males [alcohol] (INPA-TRI 000054); 08–12.x.2002, C.A. Azevedo, D.L. Pereira, Malaise trap, 1 male [pinned] (INPA-TRI 000055); 06.i.2010, A.M.O. Pes leg., 9 larvae and 3 pupae [alcohol] (INPA-TRI 000056), 1 larva and 1 pupa [alcohol] (MZSP) and 1 larva and 1 pupa [alcohol] (DZRJ); Estrada de Balbina km 12, Igarapé do Santuário, 02°03’36”S 59°55’35”W, 05.vii.1996, Xavier, F.F.F. leg., 1 male [pinned] (INPA-TRI 000057); Balneário Sossego da Pantera, Igarapé da Onça, 02°00’52”S 60°01’43”W, 31.v.2000, A.M.O. Pes, J.O. da Silva, J. Bosco leg., Lençol com luz mista, 2 males [pinned] (INPA-TRI 000058); 03–04.v.2000, Arm. Pennsylvania luz UV, 1 male [alcohol] (DZRJ) and 5 males [alcohol] (INPA-TRI 000059); 8–11.x.2002, A.M.O. Pes, J.O. da Silva leg., 14 males [pinned] (INPA-TRI 000060); 14.v.2015, G. R. D. Gomes, J.O. da Silva leg., 3 larvae [alcohol] (INPA-TRI 000061); Corredeira Santo Amaro, Igarapé da Onça, 02°02’20,2”S 59°50’40,8”W, L.M. de Camargos leg., 1 male and its pupal exuviae [alcohol] (INPA-TRI 000062); 02°02’21.4”S 59°50’43.9”W, 31.viii.2010, J.O. da Silva leg., 1 larvae [alcohol] (INPA-TRI 000063); Condomínio Bosque das Águas, Igarapé dos Veados, 02°02’42.8”S 60°01’20.3”W, L.M. de Camargos leg., 1 male and its pupal exuviae [alcohol] (INPA-TRI 000064); Cachoeira da Maroca, 02°00’55,8”S 59°51’33”W, 20.iii.2015, G. R. D. Gomes, J.O. da Silva leg., 7 larvae [alcohol] (INPA-TRI 000065). Pará, Santarém: Alter do Chão, ADC 10, Igarapé do Heitor, 02°32’22”S 54°55’54”W, 21.x.2006, J.L. Nessimian, A.M.O. Pes, J. Zuanon leg., 1 male [alcohol] (INPA-TRI 000066).
description: Published as part of Camargos, Lucas M., Pes, Ana Maria & Hamada, Neusa, 2020, New Neotropical species of Marilia Müller (Trichoptera: Odontoceridae), pp. 1-41 in Zootaxa 4853 (1) on pages 2-6, DOI: 10.11646/zootaxa.4853.1.1, http://zenodo.org/record/4410232