Neoadoxoplatys pusillus Sampaio, Rider & Campos, 2025

Neoadoxoplatys pusillus Sampaio, Rider & Campos sp. nov.

( Figs. 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Etymology. The epithet refers to the small body size. Latin: pusillus (m.), very small.

Holotype. Female, here designated. Brazil, Amazonas. Labels: Brazil - AM / 28-V-1976 / I.S. Gorayeb // INPA / Em luz // D. A. Rider Collection.

Diagnosis. Antennomeres I slightly surpassing the mandibular plates; mandibular plates surpassing clypeus; labium attaining the middle of urosternite IV; pronotum twice as wide as long; corial apical margin round.

Description. Body oval, ocher, punctures black, shallow ( Fig. 1 View FIGURE 1 , A–C). Head. Wider than long, longitudinally convex. Eyes globose, ocelli placed behind the line connecting the posterior margin of eyes; ocellar diameter at least ¼ of eye width. Mandibular plates slightly reflected, concave surface, each as wide as clypeus and slightly surpassing it, outer margins convex, apices acute. Antennal tubercle with a small spine anteriorly oriented, antennae with five antennomeres and sparse setae, antennomeres I slightly surpassing mandibular plates; proportion of antennomeres: I>II<III<IV<V ( Fig. 2 View FIGURE 2 , A). Bucculae strongly elevated, rounded anteriorly, evanescent, confluent posteriorly. Labium attaining middle of urosternite IV ( Fig. 1 View FIGURE 1 , B); labiomere I inserted anterior to midline of bucculae, exceeding bucculae posteriorly; intercalary segment (int) present, measuring approximately ⅓ of labiomere I; proportion of labiomeres: I>int<II ≅ III>IV.

Thorax. Pronotum trapezoidal, twice as wide as long, anterior margin concave, anterolateral angles with a rounded projection; lateral margins slightly concave, humeral angles posteriorly tumescent ( Fig. 2 View FIGURE 2 , A). Scutellum longer than wide; basal angles shallowly foveate, each with small concolorous, impunctate callous; width at frenal constriction half the basal width. Coria with a concolor spot at apex of each radial vein; each corial apical margin round, apex attaining connexival segment VI ( Fig. 1 View FIGURE 1 , A). Prosternum excavated, v-shaped; mesosternum carinate; metasternum hexagonal, posterior margin concave receiving abdominal tubercle. Mesopleural evaporatoria occupying the posterior half of mesopleura from the coxal socket to the lateral pleural margin, and attaining the pleural anterior and posterior angles; metapleural evaporatoria occupying most of metapleural width, surrounding the peritreme, with convex posterior margin; peritreme disc type, with convex posterior margin and rounded at apex, surpassing middle of pleural width; ostiole laterally oriented ( Fig. 2 View FIGURE 2 , B). Legs yellowish; dorsal surface of tibiae shallowly grooved.

Abdomen. Sternites shallowly punctured on the lateral thirds, unpunctured medially; urosternite III broadly tumescent medially ( Fig. 1 View FIGURE 1 , B); trichobothria lateral to the imaginary band connecting the spiracles.

Male. Unknown.

Female. Genitalia ( Fig. 3 View FIGURE 3 ). Valvifers VIII longer than wide, subtriangular with juxtaposed sutural margins, posterior margins convex; laterotergites VIII as wide as long, subtriangular and with concave surface; exposed portion of valvifers IX trapezoidal, wider than long, posterior margin slightly convex; laterotergites IX with concave surface, lateral margins straight, mesial margins angulate, apices round, not attaining the posterior margin of mediotergite VIII, and partially covering the segment X; segment X trapezoidal, longer than wide.

Measurements (n=1). Total length 8.6; width of abdomen 4.5; head length 1.5; width 1.9; pronotum length 2.1; width 4.2; scutellum length 3.3; width 2.5; length of antennomeres: I 0.5; II 0.3; III 0.7; IV 0.9; V 1.2; length of labiomeres: I 0.7; Int. 0.2; II 1.3; III 1.3; IV 1.1.

Distribution. Brazil (Amazonas).

Comments. Neoadoxoplatys pusillus sp. nov. differs from all the species in the genus by the smaller size, as all other species are more than 10mm long ( Fig. 4 View FIGURE 4 ). The new species is more similar in size to N. longirostra ( Fig. 4 View FIGURE 4 , D–E), from which N. pusillu s can be easily separated by the shorter labium attaining urosternite IV (in N. longirostra the labium attains urosternite VI), and mandibular plates surpassing clypeus (mandibular plates and clypeus subequal in N. longirostra ). The new species differs from N. saileri ( Fig. 4 View FIGURE 4 , J–K) by the light brown color, antennomeres I surpassing mandibular plates, and corial posterior margin round ( N. saileri is dark brown, with antennomeres I not surpassing mandibular plates, and corial posterior margin subrectilinear); from N. haywardii ( Fig. 4 View FIGURE 4 , G–H) by the mandibular plates surpassing clypeus, labium attaining urosternite IV, and corial posterior margin round ( N. haywardii have mandibular plates not surpassing clypeus, labium attaining urosternite V, and corial posterior margin subrectilinear); and from N. thomasi by the antennomeres I surpassing mandibular plates, and corial posterior margin round ( N. thomasi have antennomeres I not surpassing mandibular plates, and corial posterior margin subrectilinear). Unfortunately, we were unable to access images of the types of N. thomasi , so all comparisons with this species were made based on the original description and illustrations.