Itauara robertsonae, Alves & Dumas & Nessimian & Santos, 2023

Alves, André Almeida, Dumas, Leandro Lourenço, Nessimian, Jorge Luiz & Santos, Allan Paulo Moreira, 2023, Born from rock: eight new species of Itauara Müller, 1888 (Trichoptera: Glossosomatidae) from southeastern Brazil, including phylogenetic and distributional comments on the genus, European Journal of Taxonomy 885, pp. 99-133 : 118-120

Itauara robertsonae sp. nov.

urn:lsid:zoobank.org:act:B489D6AC-1224-4CD2-BA07-98066F98D52A

Fig. 8

Differential diagnosis

This new species belongs to the brasiliana species group and was recovered as sister group to the clade including all other species in the group. Itauara robertsonae sp. nov. is similar to I. flinti , and I. simplex in the lateral view of the tergum X, which has the dorsomesal margin produced and slightly downturned. However, I. robertsonae is easily distinguished from other species by the apically bifid tergum X, with each lobe rounded ( Fig. 8B ). In addition, this new species has a pair of distinctive spiniform processes arising from the phallobase, with strong curvature dorsally directed ( Fig. 8A ).

Etymology

The specific epithet is in honor of Dr Desiree R. Robertson, in reference to her important contributions to Glossosomatidae systematics.

Material examined

Holotype BRAZIL • ♂; Minas Gerais, Jaboticatubas, Parque Nacional da Serra do Cipó, Trilha para o Cânion das Bandeirinhas , Rio Mascates ; 19°24′31.1″ S, 43°34′35.4″ W; alt. 807 m; 18 Nov. 2018; A.A. Alves and A.P.M. Santos leg.; white sheet; DZRJ 7638 .

Paratypes BRAZIL • 27 ♂♂; same collection data as for holotype; DZRJ 7635 • 10 ♂; same collection data as for holotype; MNRJ-ENT10-186 • 1 ♂; same collection data as for holotype; Trilha para o Cânion das Bandeirinhas, riacho de 2ª ordem ; 19°24′20.1″ S, 43°34′44.2″ W; alt. 818 m; 16 Nov. 2018; A.A. Alves and A.P.M. Santos leg.; Pennsylvania trap; DZRJ 7637 • 1 ♂; same collection data as for holotype; Santana do Riacho, Cardeal Mota, Rio Cipó, Cachoeira Grande ; 19°20′51.2″ S, 43°38′03.5″ W; alt. 795 m; 21 Apr. 2010; L.L. Dumas and A.P.M. Santos leg.; DZRJ 7636 .

Description

Adult male

Length of each forewing 1.9–2.3 mm (n = 39). Head, thorax, and appendages, in alcohol, light brown. Forewings covered with brown setae, slightly broad after anastomosis, with anterior and posterior margins approximately parallel, apex subacute; forks I, II, and III present; Sc and R1 veins not fused; fork I sessile; forks II and III petiolate, with stem longer than fork; Cu1 vein complete, reaching wing margin; Cu1 and Cu2 veins intersecting near of anastomosis; Cu2 vein with row of erect setae; A3 vein absent; crossveins constituting relatively straight transverse line; Rs vein shorter than discoidal cell. Hind wings with anterior and posterior margins approximately parallel, with apical portion tapered; forks II and V present; Sc and R1 veins converging near to wing margin; A2 vein absent. Spur formula 1, 4, 4, foretibial spur reduced and hairlike. Segment VI with digitate process, with acute apex.

Male genitalia

Preanal and inferior appendages absent. Segment IX broad medially; anterior margin rounded, concave in ventral and dorsal views; posterolateral margin slightly sclerotized. Tergum X partially fused to tergum IX; dorsomesal margin with bifid, slightly downturned, elongate process ( Fig. 8A–B ); dorsolateral margin slightly expanded and irregular, in dorsal and ventral view, with setae ( Fig. 8B–C ); ventrolateral margin with small trilobed process, with setae ( Fig. 8A, C ). Parameres present, paired, arising ventrobasally in relation to phallobase, wider basally, gradually tapering to apex, slightly sinuous in ventral view, slightly curved in lateral view ( Fig. 8A, C ). Phallobase reduced, slightly sclerotized; with pair of spiniform processes, strongly curved dorsally, and with lightly sclerotized region, as window at end of second third of length ( Fig. 8A, C ). Phallicata forming long sclerotized dorsal sheath extending from phallobase, slightly sinuous, with apical portion dorsally curved; internally with slender portion, which is more sclerotized, following shape of phallicata ( Fig. 8A ). Endophallus membranous, enlarged, and convoluted ( Fig. 8A, C ).

Female and immatures

Unknown.

Distribution

Brazil [state of Minas Gerais (municipality of Jaboticatubas)]

Figures

Fig. 8. Itauara robertsonae sp. nov., holotype (DZRJ 7638), male genitalia. A. Lateral view. B. Dorsal view. C. Ventral view. Scale bar = 0.1 mm.