Cernotina divisor Pires, Pes, Camargos & Hamada, 2024

Pires, Marcos Adriano Ribeiro, Pes, Ana Maria, Camargos, Lucas M. & Hamada, Neusa, 2024, New Cernotina Ross 1938 (Trichoptera: Polycentropodidae) from Serra do Divisor, Acre, Brazil, Zootaxa 5529 (3), pp. 570-582 : 575-577

Cernotina divisor Pires, Pes, Camargos & Hamada sp. nov.

( Figs. 4 , 5 , 6 )

Differential diagnosis. Cernotina divisor sp. nov. shares similarities with Cernotina tiputini Camargos, Ríos-Touma & Holzenthal, 2017 from Ecuador, particularly in segment IX and the inferior appendage in lateral and ventral views. It differs from the Ecuadorian species by the shape of the dorsolateral process of the preanal appendage, which is not round as in C. tiputini . The dorsolateral spines are located in the preapical region and are surrounded by microsetae diverging from the apical spines in C. tiputini . The dorsolateral process also involves the intermediate appendage, which does not occur in C. tiputini . The intermediate appendage length is longer and narrower, possessing three apical spines. The mesoventral process of each preanal appendage also differs from the Ecuadorian species by bearing stout setae. The dorsal branch of each inferior appendage is also different in its form and the presence of a line of spines from mid-to-apical regions.

Description. Adult male. Length of each forewing (mean = 3.55 mm, standard deviation = 0.196) (n = 8). General color (in alcohol) pale brown ( Fig 4A ). Forewings each with apical forks II, IV, and V; fork II sessil ( Fig. 5A ); discoidal and thyridial cells present; Sc vein extending to mid-length of costal margin; base of R vein attenuate, R1 vein gradually wider from r crossvein to apex, wing membrane of stigma thicker between C, apical portion of Sc vein, and mid-length of R1 vein; intersection of M1+2, M3+4, and m-cu crossvein with pale spot (outlined by dashed line in Fig. 5A ). Hind wings each with apical forks II and V ( Fig. 5B ); discoidal and thyridial cells absent; Sc vein thick basally, gradually attenuate apically. R1 vein thick throughout its length. Radial vein (R) main branch obsolete basally; R2+3 gradually thicker to apex; 3A vein absent.

Male genitalia. In lateral view ( Fig. 6A ), sternum IX pentagonal, about 3/4 as tall as entire male genital complex; in ventral view ( Fig. 6C ), with anterolateral margin almost as wide as posterolateral margin, anteroventral margin with deep, broad concavity, with sclerotized ventral ridge extending internally in V-shape, and posteroventral margin broadly concave and sinuous. Tergum X fused with intermediate appendages. Intermediate appendages in lateral view ( Fig. 6A ) membranous, strongly curved ventrad, with blunt apices, each partially fused with corresponding dorsolateral process of preanal appendage, longer than segment IX, with three stout apical setae; in dorsal view ( Fig. 6B ) closely proximate with each other in basal half, divergent mid-dorsally in apical half, with setae and microsetae on dorsal surfaces. Preanal appendages each composed of two processes: (1) dorsolateral process in lateral view ( Fig. 6A ) shorter than segment IX, with dorsal and ventral margins concave, several setae dorsolaterally, and two thick subapical spines surrounded by dense fine setae; in dorsal view ( Fig. 6B ) subtriangular; (2) mesoventral process in lateral view ( Fig. 6A ) shorter than dorsolateral process, intermediate appendage, and inferior appendage, triangular, bearing seven stout setae along mesoventral margin, in ventral view ( Fig. 6F ) basally fused with corresponding mesoventral process at midline. Inferior appendages about as long as segment IX; in lateral view ( Fig. 6A ) digitiform, bent slightly ventrad, each with ventral margin slightly concave, dorsal margin slightly convex, apically round; in ventral view ( Fig. 6C ), mesal margin of appendage basally straight with protuberance at 2/3 length and stout preapical setae in concave preapical region, three stout setae on apicodorsomesal margin above stout subapical tooth; anterior basal plate extending to 2/3 of ventral midline of sternum IX; apicomesal lobe absent; dorsal branch oblong in lateral view, sinuous, with apex round, almost as long as main body of appendage and arising basally on it, directed posterad and slightly laterad, bearing 15 stout setae mesally and apically ( Fig. 6C inset), without basal projection. Phallus slender, apical half sinuously curved ventrad then slightly recurved dorsad ( Fig. 6D ), with 2 elongate phallic spines free in phallic membrane; phallotremal sclerite anteroventral, large, cordate in lateral view ( Fig. 6D ), with 2 lobes projecting posterad in dorsal view ( Fig. 6E ).

Female and immature stages: Unknown.

Type material. Holotype male: BRAZIL, Acre: Mâncio Lima, Parque Nacional da Serra do Divisor, Igarapé do Mundico (#17), 7.4277°S, 73.6622°W, 260 m a.s.l, 19–27.vii.2022, A. Pes, G.R. Desidério, J.O. Silva, R.B. Pinedo, H.L.M.S. Ferreira leg., Malaise trap, 1 male [alcohol] ( INPA-TRI 000149 ) ( INPA) . Paratypes: BRAZIL: same data as for holotype, 2 males [alcohol] ( INPA-TRI 000150 ) ( INPA) . Same data as for holotype, except: Igarapé Morro da Poronga (#16), 7.4299°S, 73.6620°W, 260 m a.s.l., 19–27.vii.2022, Pennsylvania trap, 2 males [alcohol] ( INPA-TRI 000151 ) ( INPA) . Same data as for holotype, except: Igarapé da Caverna (#10), 7.4476°S, 73.6825°W, 250 m a.s.l., 18–26.vii.2022, Malaise trap, 1 male [alcohol] ( INPA-TRI 000152 ) ( INPA) . Same data as for holotype, except: Igarapé Cachoerinha (#06), 7.4952°S, 73.6989°W, 250 m a.s.l., 17–26.vii.2022, Malaise trap, 1 male [alcohol] ( MNRJ) . Same data as for holotype, except: Igarapé Cachoerinha (#06), 7.4952°S, 73.6989°W, 250 m a.s.l., 17–22.vii.2022, Pennsylvania trap, 1 male [alcohol] ( MZUSP) .

Distribution. BRAZIL, Acre State ( Fig. 7B, 7C ).

Etymology. The specific epithet is a noun in apposition that refers to the type locality of the new species, Parque Nacional da Serra do Divisor.

Figures

FIGURE 4. Cernotina divisor sp. nov., male adult holotype. 4A, habitus, left lateral. 4B–4D, genitalia: 4B, left lateral; 4C, dorsal; 4D, ventral. Scale bars: 4A = 1 mm; 4B, 4C, 4D = 0.1 mm.

FIGURE 5. Cernotina divisor sp. nov., male adult holotype, right wings, dorsal. 5A, forewing; 5B, hind wing. Scale bar: 0.5 mm.Abbreviations: C = costal vein; CU1a, CU1b, Cu2 = cubital veins, dc = discoidal cell; I–V = apical forks, M1–M4 = medial veins; m-cu = mediocubital crossvein; R1–R5 = radial veins; r = radial crossvein; r-m = radiomedial crossvein; s = sectoral crossvein; Sc = subcostal; tc = thyridial cell; 1A–3A = anal veins

FIGURE 6. Cernotina divisor sp. nov., male adult holotype, genitalia. 6A, left lateral; 6B, dorsal; 6C, ventral; 6D, phallus, left lateral; 6E, phallus, dorsal; 6F, paired mesoventral processes of preanal appendages, ventral. Scale bar: 0.1 mm.

FIGURE 7. Distribution maps of selected Cernotina species. 7A, previously known distributions and position of the Parque Nacional da Serra do Divisor in Brazil; 7B, position of the study area in the Parque Nacional da Serra do Divisor; 7C, distributions of new species and new records in the study area of Parque Nacional da Serra do Divisor, with a key to species symbols for all maps 7A–7C.