Itauara holzenthali, 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 : 114-116

Itauara holzenthali sp. nov.

urn:lsid:zoobank.org:act:0925210F-ADEA-45A4-9E25-CCA96BFA28F3

Fig. 6

Differential diagnosis

This species belongs to the brasiliana species group. Since the results of the parsimony analysis were unresolved in this group, this new species appears in a polytomy in the strict consensus tree. Itauara holzenthali sp. nov. is similar to I. flinti and I. simplex Robertson & Holzenthal, 2011 in the general aspect of the tergum X, but in the new species this structure has a characteristic dorsomesal process with a truncated apex in dorsal view ( Fig. 6B ). In addition, I. holzenthali can be distinguished from other species by the presence of a pair of short digitate processes between the ventrolateral processes of tergum X ( Fig. 6A, C ).

Etymology

This new species is named in honor of Dr Ralph W. Holzenthal, for his important contributions to the knowledge of Neotropical caddisflies.

Material examined

Holotype BRAZIL • ♂; Rio de Janeiro, Itatiaia, Penedo, Rio Palmital ; 22°25′34″ S, 44°32′52″ W; alt. 637 m; 6 Mar. 2008; L.L. Dumas and J.L. Nessimian leg.; DZRJ 7642 .

Paratype BRAZIL • 1 ♂; same collection data as for holotype; DZRJ 7643 .

Description

Adult

Length of each forewing 2.9–3.0 mm (n = 2). 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 slightly rounded; forks I, II, and III present; Sc and R1 veins not fused; fork I sessile; fork II petiolate, with stem shorter than fork; fork III petiolate, with stem longer than fork; Cu1 vein complete, reaching wing margin; Cu1 and Cu2 veins separating on anastomosis; Cu2 vein with row of erect setae; A3 vein absent; crossveins constituting relatively straight transverse line; Rs vein shorter than discoidal cell. Hind wing with margins approximately parallel, with apical portion tapered; forks II and V present; Sc and R1 veins converging very near to wing margin; A2 vein absent. Spur formula 1, 4,4, foretibial spur reduced and hairlike. Sternum VI with digitate process, with acute apex.

Male genitalia

Preanal and inferior appendages absent. Segment IX dorsally narrow, broad ventrally; anterior margin rounded; posterolateral margin slightly sclerotized. Tergum X partially fused to tergum IX; dorsomesal margin produced into single process, tapering to truncate apex, in dorsal view ( Fig. 6B ), and acute and downturned in lateral view ( Fig. 6A ); dorsolateral margin slightly irregular, setose, without processes ( Fig. 6A–B ); ventrolateral margin with paired setose processes, and medially, between ventrolateral processes, with pair of short digitate process ( Fig. 6A, C ). Parameres present, paired, arising ventrobasally from fused endotheca and phallobase, sclerotized and rod-like, slender and elongate, basally with strong curvature posterad, with subapical portion slightly broader, directed dorsally, pointed apically ( Fig. 6A, C ). Phallobase reduced, slightly sclerotized. Phallicata forming long, slightly sinuous, slender, sclerotized dorsal sheath extending from phallobase, with pair of basoventral processes ( Fig. 6A, C ). Endophallus membranous, enlarged and convoluted, with short, pointed, ventral process near apex ( Fig. 6A, C ).

Female and immatures

Unknown.

Distribution

Brazil [state of Rio de Janeiro (municipality of Itatiaia)]

Figures

Fig. 6. Itauara holzenthali sp. nov., holotype (DZRJ 7642), male genitalia. A. Lateral view. B. Dorsal view. C. Ventral view. Scale bar = 0.1 mm.