Oxyethira (Loxotrichia) carajas,

Neto, Jaime De Liege Gama, Ribeiro, José Moacir Ferreira & Passos, Mahedy Araujo Bastos, 2019, Two new species of Hydroptilidae (Insecta: Trichoptera) from the Serra dos Carajás, Pará state, northern Brazil, Zootaxa 4695 (4), pp. 385-390: 388-389

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Oxyethira (Loxotrichia) carajas

sp. nov.

Oxyethira (Loxotrichia) carajas  sp. nov.

Figs. 3View FIGURE 3 A–3D

Diagnosis. The male of Oxyethira carajas  sp. nov. is similar to that of O. hozosa Harris & Davenport 1999  , resembling this species mainly in the general shape of the basally fused inferior appendages, separated apicomesally, narrowing posterolaterally, and each bearing a stout apical seta.Additionally, segment IX has a pair of ventral processes in both species. However, in the new species the inferior appendages are apically round in lateral view (truncate in O. hozosa  ). Moreover, in O. carajas  sp. nov. the ventral process of each inferior appendage is blade-like, while in O. hozosa  the process is finger-like.

Description. Male. Length of each forewing 1.55 mm (n = 1). Head unmodified, with 3 ocelli; antennae broken and lost. Tibial spur count 1,3,4. Dorsum of head dark brown with pale yellow setae; thorax dark brown with pale yellow setae dorsally, light brown ventrally; leg segments with light brown setae. Forewings covered with fine yellow setae and small scattered patches of dark brown setae.

Male Genitalia. Abdominal segment VII annular, with posteromesal ventral process simple and pointed ( Fig. 3AView FIGURE 3). Segment VIII, in lateral view, with anterolateral margins slightly sinuous and posterior margins medially point- ed ( Fig. 3AView FIGURE 3); in dorsal view, with posterior margin irregularly concave ( Fig. 3BView FIGURE 3); in ventral view with posterior mar- gin deeply incised ( Fig. 3CView FIGURE 3). Segment IX tapering anteriorly; anterolateral margin narrow and elongate, withdrawn into segments VII–VIII in lateral view ( Fig. 3AView FIGURE 3); ventrally with pair of broad blade-like posteromesal processes ( Figs. 3A, 3CView FIGURE 3). Tergum X membranous and short in dorsal view; oblong and ventrally sclerotized in lateral view ( Figs. 3A, 3BView FIGURE 3). Inferior appendages short and apically round in lateral view; in ventral view fused basally, separate and widely divergent apically, narrowing posterolaterally, each bearing stout apical seta ( Fig. 3CView FIGURE 3). Subgenital process in lateral view strongly curving ventrad; in ventral view, rectangular with pair of submesal knob-like processes ( Figs. 3A, 3CView FIGURE 3). Bilobed processes extending posterad, with spine-like apical seta ( Fig. 3BView FIGURE 3). Phallus with tubular basal half; apical half membranous, covered by numerous microspines, internally with long, sinuous and sclerotized rod with apex acute and curved to left in ventral view ( Fig. 3DView FIGURE 3).

Female, pupa, larva, and egg: Unknown.

Holotype male. BRAZIL: Pará : Parauapebas municipality, Serra dos Carajás, low order stream, 6°2’24.828”S; 50°17’38.184”W, 7–9 Aug. 2018. Pennsylvania light trap, J.L. Gama Neto & M.J. Ferreira Ribeiro, cols. (alcohol; MPEG).GoogleMaps 

Distribution: Brazil (Pará state)

Etymology. The term “carajas” is a noun used in apposition, referring to the type locality.


Museu Paraense Emilio Goeldi