Smicridea (Rhyacophylax) araguaiense, Albino, Jeyson Lazaro Duque, Pes, Ana Maria & Hamada, Neusa, 2011

Albino, Jeyson Lazaro Duque, Pes, Ana Maria & Hamada, Neusa, 2011, Smicridea (Trichoptera, Hydropsychidae) from 3 Brazilian Amazonian States: New species, larval taxonomy and bionomics, Zootaxa 3113, pp. 1-35 : 3-5

Smicridea (Rhyacophylax) araguaiense sp. nov.

Figs 1–5

Adult male. Forewing length 3.71 mm (n = 1). General color in alcohol yellow. Antennae and legs yellow. Forewings yellow, except costal and pterostigma region, transverse veins, nigma and thyridial spots on each wing dark brown; transverse white (translucent) band near distal region ( Fig. 1 ). Anterolateral glandular processes of sternum V each with length (0.36 mm) surpassing the posterior margin of this segment ( Fig. 2 ).

Male genitalia. Segment IX margins sclerotized, dorsomesally ending in protuberant lobule covered apicodorsally with transverse rows of small spikes, dorsal posteromesal margin higher than anterolateral and dorsal anteromesal margins, in lateral view ( Fig. 3 ). Tergum X, with distoventral margins and apex well sclerotized; in lateral view, each ventrolateral margin with 4 spines, dorsal margin convex, ventral margin straight ( Fig. 3 ); in dorsal view, divided medially to base in 2 halves, mesal margins sclerotized to blunt, setose tips ( Fig. 4 ). Inferior appendages 2-segmented; each with basal segment long, its distal region slightly enlarged and covered by long setae; distal segment shorter, half as long as basal segment, apically rounded in dorsal and lateral views ( Figs 3, 4 ). Phallus with tubular phallobase, its basal section enlarged, forming angle of about 81º with median region; apical region of phallotheca slightly enlarged, with 3 pairs of endothecal paramere spines, 2 pairs on each lateral margin and 1 pair dorsally ( Figs 3, 5 ). Internal sclerotized rod (apical portion of ejaculatory duct), in lateral view, slender and long, 2/ 3 as long as phallobase, in dorsal view, longitudinally divided in 2; in dorsal view phallotheca expanded apically to spikes, with endophallic membranes extruded and constricted beyond spikes and then expanded again to broad section and then narrower; dorsal periphallic membranes absent ( Fig. 5 ).

Female and immatures. Unknown.

Diagnosis. The male of S. araguaiense sp. nov. differs from those of the other species described in the subgenus by having the distoventral margins of tergum X sclerotized and the distal region starting in a semi-truncated form and ending at an oblique tip, with 4 pairs of spines ventrolaterally and mesal margins sclerotized with round, protruding apices. Apical region of phallotheca with 3 pairs of endothecal paramere spines, 2 pairs on each lateral margin and 1 pair dorsally; sclerotized apical portion of ejaculatory duct slender and long, divided in 2 parts in dorsal view. It is similar to S. coronata in that it has the spines on the margin of tergum X, but differs in the form of the phallus.

Biology. Adult specimens were collected in light traps placed over streams with average width of 4.7 m, located in areas with well-preserved, dense gallery forest, in the Cerrado biome.

Distribution. Brazil, Mato Grosso State.

Etymology. The name araguaiense is derived from the Araguaia River Basin, where the specimens were collected.

Material examined. Holotype male: BRAZIL, Mato Grosso, Nova Xavantina, Campus da Unemat, 05.x.2003, light trap, H.S.R. Cabette, 1 male [alcohol] ( INPA).

Figures

FIGURES 1 – 2. Smicridea (Rhyacophylax) araguaiense sp. nov. 1) Male right forewing, dorsal view, scale bar = 500 µ; 2) sternum V, ventral view, showing anterolateral glandular processes, scale bar = 200 µ.

FIGURES 3 – 5. Smicridea (Rhyacophylax) araguaiense sp. nov. male genitalia. 3) Left lateral view; 4) dorsal view; 5) phallus, dorsal view.