Chimarra (Chimarrita) truncata, Moreira & Dumas & Rozo & Desidério & Takiya, 2022

Moreira, Paula Dias, Dumas, Leandro Lourenco, Rozo, Maria Paula, Desiderio, Gleison Robson & Takiya, Daniela Maeda, 2022, Integrative taxonomy supports two new species of Chimarra Stephens, 1829 from Brazil (Trichoptera: Philopotamidae), Arthropod Systematics & amp; Phylogeny 80, pp. 169-185 : 169

3.2.1. Chimarra (Chimarrita) truncata sp. nov.

Type locality.

Igarapé Mato Grosso, Novo Airão, Amazonas State, Brazil.

Diagnosis.

Chimarra (Chimarrita) truncata sp. nov. is most similar to C. (Chimarrita) xingu Blahnik, 1997 by the short, fully divided tergum X with dorsal ridges and foldlike areas on outer margin of each lobe and the simple, almost uniform in width inferior appendages. However, the new species has an apically subtruncated ventral process of segment IX, while in C. (Chimarrita) xingu this process is pointed. Furthermore, C. (Chimarrita) truncata sp. nov. can be recognized by inferior appendages with truncated apices both in lateral and ventral view (rounded in C. xingu ).

Description.

Adult male: forewing length 2.6-3.0 mm (n=6; holotype = 2.6 mm). General color (in alcohol) uniformly pale brown, except dorsum of the head dark brown, antennae and palps pale brown. Head with anterior, anteromesal, posterior, and posterolateral setal warts; posterior setal warts large, triangular, meeting broadly on median portion; postocular parietal sclerite triangular, slightly extending below eye. Maxillary palps relatively short, 2nd segment longer than 3rd segment, apicomesally with stout setae. Wing venation typical for the subgenus (Fig. 3 ); forewing with forks I, II, III, and V present, stem of Rs straight, crossveins r, s, r-m, and m nearly linearly arranged and unpigmented, crossvein m-cu and apex of Cu2 also hyaline; 2A apparently forked to 1A and 3A (Fig. 3A ); hind wing venation not reduced, with forks I, II, III, and V present, Sc completely separated from R1; crossveins s, r-m and m-cu unpigmented, crossvein between 1A and 2A (Fig. 3B ). Male protarsal claws nearly symmetrical; tibial spur formula 1-4-4.

Male genitalia (Fig. 4 ): Segment IX, dorsally with paired mesal and mesolateral ridges on each side of midline, mesal ones poorly developed (Fig. 4B ); in lateral view, tall, with anterior margin concave, expanded anteroventrally and anterodorsally; posterolateral margin broadly convex (Fig. 4A ); ventral process moderately elongate, approximately 1/3 as long as inferior appendages, wider at basal half, slender at distal half, with subtruncate apex (Fig. 4A , 4C ). Tergum X short, fused to segment IX; in dorsal view, fully divided mesally, forming 2 lobes with distinct sensilla foldlike area on outer margin, folding itself dorsally; apex of each lobe distinctly sclerotized, acute and slightly turned inwardly (Fig. 4B ); in lateral view, strongly humped dorsally, apex short, slender, curved apicoventrally (Fig. 4A ). Preanal appendages short, rounded, fused dorsolaterally near base of tergum X (Fig. 4A , 4B ). Inferior appendages of moderate length, simple in structure, almost uniform in width in lateral and ventral views, apex truncate, with slightly irregular margin (Fig. 4A, C ). Phallic apparatus with phallotheca tubular, bearing basodorsal and apicoventral pointed extensions; phallic spine single, stout, with moderate length, emerging dorsally near base of phallotheca; endotheca elongate, inflated dorsoapically; phallotremal sclerite complex indistinct (Fig. 4D , 4E ).

Etymology.

The specific epithet is an allusion to the characteristic inferior appendages, which are apically truncated. Derived from the Latin, " Chimarra truncata " = piece cut off, tip, end.

Material Examined.

Holotype. BRAZIL • ♂; Amazonas State, Novo Airão, Rod. AM 352, km-68, Igarapé Mato Grosso; 02°48 ’58” S, 60°55 ’18” W; 21-31.vii.2016; J.A. Rafael & F.F. Xavier leg.; Malaise trap; INPA (DNA voucher ENT4293) . - Paratypes. BRAZIL • 3 ♂♂; same data as for holotype; INPA (DNA vouchers ENT4292, ENT4294, ENT4295) • 3 ♂♂; same data as for holotype; except 08-20.v.2017; DZRJ 7825-DZRJ 7827 (DNA vouchers ENT4296-4298) • 4 ♂♂, 1 ♀; Pará State, Belterra, BR-163, Km 85, Igarape do Branco , entrance LBA; 03°03 ’04” S, 54°55 ’29.3” W; 91 m a.s.l.; 11-12.xii.2014; J.O. Silva & S.M. Couceiro leg.; Pennsylvania trap INPA (DNA vouchers ENT5580-ENT5583, ENT5591) • 1 ♂, 1 ♀; same data as preceding, MNRJ (DNA vouchers ENT5584, ENT5592) .

Figures

Figure 3. Chimarra (Chimarrita) truncata sp. nov., holotype wing venation: A right forewing; B right hind wing. Abbreviations: DC, discoidal cell; MC, medial cell; TC, thyridial cell.

Figure 4. Chimarra (Chimarrita) truncata sp. nov., holotype male genitalia: A left lateral view; B dorsal view; C ventral view; D phallus, left lateral view; E phallus, ventral view.