Segonalia machadoi Cavichioli & Takiya, 2016, sp. nov.

Segonalia machadoi sp. nov.

(Figures 10–19)

Material examined. Holotype, ♂, “ Brasil, Piauí, PN [Parque Nacional] de\ Sete Cidades 4˚5’57”S\ 41˚42’34”W 193m \ 12.II.2013 \ (sweep) DM Takiya” (CZMA). Paratypes, 2♂, 1♀, same data as holotype, (DZRJ); 1♂, 1♀, same data as holotype, (DZUP); 2♂, 1♀, “ Brasil, Piauí, PN [Parque Nacional] de\ Sete Cidades 4˚5’57”S\ 41˚42’34”W 193m \ (YPT) [Yellow Pan Trap] 9–10.II.2013 \ Oliveira M. &\ Somavilla A.”, (CZMA); 2♂, 1♀, same data as preceding, (INPA); 3♂, same data as preceding, (DZRJ); 3♂, 1♀, same data as preceding, (DZUP); 2♂, “ FLONA Carajás–PA\ (Tarzan-Malaise/ Mata)\ 30.I–05.II.2010 \ Kumagai/Lopes/Lima col.”, (DZUP).

Measurements (length in mm). Holotype male, 4.3. Males, 4.3–4.8. Females, 4.9–5.0.

Description. Head (Fig. 10) with median length four-tenths of interocular width and three-tenths of transocular width. Crown (Fig. 10) slightly concave between ocelli; anterior fourth shagreen and posterior three-fourths smooth. Frons with muscle impressions distinct; median disk shagreen. Clypeus with superior portion shagreen. Genae smooth. Pronotum (Fig. 10) smooth with dorsopleural carinae complete; posterior margin straight or slightly concave. Hind legs with posterodorsal (PD) row of macrosetae with approximately 1.4x more cucullate setae than anteroventral (AV) row; AV row with approximately 2 short intercalaries between cucullate setae. Other structural characters as in the original description of S. steinbachi by Young (1977, p. 999).

Male pygofer (Fig. 11) moderately produced; surface with very small dentiform cuticular sculpturing (more concentrated near apex); macrosetae distributed in apical third; apex acute; processes absent. Valve fused to subgenital plates (Figs 11, 12); plates short, not extending posteriorly farther than midlength of pygofer; each subtriangular; plates separate from each other only at apical third of whole structure; uniseriate macrosetae along apical two-thirds of ventrolateral margins. Connective (Fig. 13) Y-shaped; shaft very long. Styles (Fig. 13) not extending posteriorly farther than apex of connective; narrowed and truncate apically; without anteapical lobe. Aedeagus (Fig. 14) with dorsal apodemes not as nearly as long as shaft; shaft elongate, directed posterodorsally, base broadened throughout basal half, dorsal lateral flanges restricted to median third; apex with a short ventral acute median process. Paraphysis (Fig. 14) with ramus tapered, curved dorsally, and acute at apex; basal portion (connected to connective, BPP in Fig. 14) approximately half length of ramus.

Female sternite VII (Fig. 15) well produced, gradually tapered to narrowly rounded apex. Internal sternite VIII mostly membranous, slightly sclerotized at connection to bases of first valvulae. Pygofer (Fig. 16) moderately produced; posterior margin acute; macrosetae distributed in apical half. First valvulae of ovipositor (Fig. 17) with bases rectangular and anterior margins truncated. Second valvulae of ovipositor (Fig. 18) slightly expanded throughout apical 3/4; dorsal margin of expanded area bearing approximately 15 continuous teeth; each tooth subtriangular and elongate with denticles throughout length; preapical area with denticles on dorsal and ventral margins; ventral prominence distinct; apex acute.

Coloration. Head (Fig. 10) black; crown with posterior two-thirds ivory (pale blue in life, Fig. 19); genae and apex of clypeus mostly yellow. Pronotum (Fig. 10) black. Mesoscutum (Fig. 10) black and scutellum yellow. Forewings (Fig. 10) dark brown to black; each with three yellow maculae: larger one at base of clavus, smaller one at apex of clavus, and oblique transverse band over bases of anteapical cells. Most thoracic sclerites and abdomen dark brown with pale areas. Legs yellow.

Etymology. The species epithet is given in honor of Dr. Angelo B. M. Machado on the occasion of his 80th birthday.

Remarks. Segonalia machadoi sp. nov. is very similar to the type species in color pattern and genitalia structure. It can be distinguished from the latter by the following features: (1) smaller size with males up to 4.8 mm (males longer than 5.4 mm in S. steinbachi); (2) male pygofer apex (Fig. 11) without a distinct apical unciform projection (present in S. steinbachi, Fig. 2); (3) aedeagus shaft (Fig. 14) with base broadened throughout basal half (broadened throughout basal third in S. steinbachi, Fig. 5) and lateral flange restricted to median third (extending more basally in S. steinbachi, Fig. 5); and (4) basal portion of paraphysis (Fig. 14) shorter than half length of ramus (longer than half length of ramus in S. steinbachi, Fig. 5). No significant differences were found between females of the two species (Figs 6–9, 15–18), which can only be separated by size and distribution.

The holotype and most paratypes of the new species were collected using yellow pan traps along a trail in Parque Nacional de Sete Cidades, a national park within the Caatinga biome. However, most of the areas where collecting was conducted had a Cerrado influence and one of those specimens was collected on Croton sp. (Euphorbiaceae).