Smicridea (Smicridea) sepala, Rocha, Isabela Cristina, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2016

Rocha, Isabela Cristina, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2016, Three new species and a new record of Smicridea McLachlan 1871 (Trichoptera: Hydropsychidae) from Minas Gerais state, Brazil, Zootaxa 4107 (3), pp. 423-430 : 427-429

Smicridea (Smicridea) sepala sp. nov.

( Figures 3 A–D)

Description. Adult male. Length of each forewing 3.84–4.48 mm (n = 11). Color in alcohol brown. Head and thorax dark brown; tegulae and head setal warts with long, dark brown setae. Antennae and legs yellowish brown, legs with short dark brown setae. Forewings brown with dark brown setae, each with base of radial and anal veins with white band; thin, white transverse band on subapical region; white spot on base of costal vein and apex of Cu2. Wing venation typical for subgenus.

Male genitalia. Segment IX 4 times longer dorsally than ventrally, with anterolateral and posterior ventrolateral margins concave and sclerotized; dorsomesally with protuberance bearing small spicules; ventromesal margin straight, pointed anteriorly and posteriorly ( Fig. 3 A); in dorsal view, subrectangular; posterodorsal margin with small spicules on narrow transverse band; lateral margins almost linear and parallelsided ( Fig. 3 B). Tergum X, in lateral view, setose, with dorsal margin concave; apex rounded, sinuous posteroventrally ( Fig. 3 A); in dorsal view, divided mesally by V-shaped incision about 1/2 its length, each half with rounded apex and lateral margin slightly sclerotized ( Fig. 3 B). Inferior appendages each two-segmented, basal segment elongate, covered with long setae; apical segment short, approximately 1/3 as long as basal segment; apex rounded in dorsal and lateral views ( Figs. 3 A, 3B). Phallus tubular, basal section enlarged and meeting apical section at about 70º angle; apical third enlarged ventrally, with distinct ventral projection resembling crown of stout spines directed ventrad; distal third of ventral surface with scabrous cuticle, covered by small, scale-like protuberances; distal third of dorsal margin concave and sinuous subapically; apex truncate ( Fig. 3 C); in ventral view, crown of spines at 2/3 length arranged in two curved longitudinal rows of bicuspid teeth ( Fig. 3 D). Internal sclerotized portion of ejaculatory duct, in lateral view, without projection, with apex ending in plate with two acute tips, one dorsal, near apex, and one apical ( Fig. 3 C); in ventral view, apex of plate with pair of dorsolateral lobes and ventromedial lobe with arrow-like sclerotized region ( Fig. 3 D).

Female and immatures. Unknown.

Diagnosis. Smicridea (S.) sepala sp. nov. is assigned to the S. (S.) fasciatella Group (Flint 1974) based on the structure of the phallus, which is a simple tube with eversible sclerites at the apex. The new species differs from all other species in the genus by the unique crown-like ventral projection of stout spines at 2/3 of the length of the phallus.

Distribution. Brazil, Minas Gerais state.

Etymology. The specific epithet is an adjective referring to the distinct crown of stout spines of the phallus, in lateral view resembling a set of flower sepals.

Material examined. Holotype male: BRAZIL: Minas Gerais: Delfinópolis, surrounding area of the Parque Nacional da Serra da Canastra, confluência do Ribeirão Grande e Córrego Mata do Engenho, 20°31’20.20”S, 46°30’37.57”W, el. 661 m, 24.iii.2015, JL Nessimian, LL Dumas, IC Rocha, ALH Oliveira & SP Gomes leg., ( DZRJ).

Paratypes: BRAZIL: Minas Gerais: Delfinópolis, surrounding area of the Parque Nacional da Serra da Canastra, confluência do Ribeirão Grande e Córrego Mata do Engenho, 20°31’20.20”S, 46°30’37.57”W, el. 661 m, 24.iii.2015, JL Nessimian, LL Dumas, IC Rocha, ALH Oliveira & SP Gomes leg., 6 males ( DZRJ); Delfinópolis, surrounding area of the Parque Nacional da Serra da Canastra, Pousada Mata do Engenho, 20°31’01.11”S, 46°30’53.38”W, el. 700 m, 24.iii.2015, JL Nessimian, LL Dumas, IC Rocha, ALH Oliveira & SP Gomes leg., 2 males ( DZRJ); Delfinópolis, surrounding area of the Parque Nacional da Serra da Canastra, afluente do Ribeirão das Bateias (Córrego Lavrinha), 20°26’28.47”S, 46°40’10.92”W, el. 683 m, 25.iii.2015, JL Nessimian, LL Dumas, IC Rocha, ALH Oliveira & SP Gomes leg., 1 male ( DZRJ); Delfinópolis, surrounding area of the Parque Nacional da Serra da Canastra, afluente do Ribeirão do Claro, 20°20’55.63”S, 46°48’12.01”W, el. 692 m, 27.iii.2015, JL Nessimian, LL Dumas, IC Rocha, ALH Oliveira & SP Gomes leg., 1 male ( DZRJ).

Figures

FIGURE 3. Male genitalia of Smicridea (Smicridea) sepala sp. nov., holotype: A, left lateral; B, dorsal; C – D, phallus: C, left lateral; D, apex, ventral.