Enitharoides lucasduquei Barbosa, Ribeiro & Nessimian,

Nessimian, Jorge Luiz, 2017, Resurrecting the genus Enitharoides Brooks, 1953 (Heteroptera: Nepomorpha: Notonectidae): description of three new species and redescription of Enitharoides brasiliensis (Spinola, 1837), comb., Zootaxa 4323 (4), pp. 469-486: 476-478

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Enitharoides lucasduquei Barbosa, Ribeiro & Nessimian

sp. nov.

Enitharoides lucasduquei Barbosa, Ribeiro & Nessimian  , sp. nov.

( Figs. 24–36View FIGURES 24 – 36, 65View FIGURE 65)

Type material. BRAZIL. Rio de Janeiro State — Cachoeiras de Macacu, Japuíba, Serra do Bertoldo , 23.III.1983, (J.M. Costa, L.F. Neto): 1 m ( DZRJ 821), holotype  ; 3 f (DZRJ 821), paratypes.

Description. MALE HOLOTYPE. Body length (from apex of head to apex of hemelytra): 14.48; greatest vertex width: 1.45; synthlipsis: 0.95; eye width: 1.90; head length: 1.35; greatest head width: 4.60; pronotum length: 1.50; greatest pronotum width: 5.45; scutellum length: 4.05; scutellum width: 4.60.

Color. Setae yellow ( Fig. 25View FIGURES 24 – 36). Head yellow. Vertex with two brown triangles. Labrum, triangle at the base of second rostral segment, line along third rostral segment length, and fourth segment, brown. Pronotum yellow. Scutellum brown centrally ( Fig. 24View FIGURES 24 – 36). Legs yellow; patch of pubescence of foretibiae and -tarsi brown. Anterior half of hemelytra yellow, posterior half brown. Hind wings hyaline mixed with brown ( Fig. 27View FIGURES 24 – 36). Abdominal terga almost entirely brown, with borders yellowish; abdominal sterna brown ( Fig. 25View FIGURES 24 – 36).

External morphology. Head with greatest width 3.4 times its median length, and 3.2 times vertex width. Vertex 1.5 times synthlipsis. Eye width 2.0 times synthlipsis. Pronotum with greatest width 3.6 times its median length and 1.2 times head greatest width, median length 1.1 times median length of head; posterior margin of pronotum concave medially ( Fig. 24View FIGURES 24 – 36). Scutellum with greatest width 1.1 times its median length; median length almost 4 times pronotum median length; punctations in longitudinal strip, with punctures rounded to elongated, shallow ( Fig. 26View FIGURES 24 – 36). Apical half of ventral surface of middle femur densely setose, setae long and thin ( Figs. 28, 30View FIGURES 24 – 36); lateral margin with 17 dark pegs ( Fig. 30View FIGURES 24 – 36); anteapical pointed protuberance well developed, triangular, with lateral margins straight ( Fig. 29View FIGURES 24 – 36). Hemelytra with nodal furrow straight, curved anterad, shorter than the distance between its tip and membranal suture. Margins of metaxyphus convex, tapering to apex; apex rounded; its surface with two strips of setae ( Fig. 31View FIGURES 24 – 36).

Genitalia. Posterior part of male genital capsule ending in acute angle without process. Right paramere with dorsal margin sinuous; anteriorly emarginate, dorsal and ventrally, making it somewhat projected; rounded posteriorly; setae distributed throughout median region ( Fig. 32View FIGURES 24 – 36). Left paramere angled anteriorly, with a slight projection on dorsal margin; rounded posteriorly; setae distributed on dorsal region ( Fig. 33View FIGURES 24 – 36).

FEMALE PARATYPES (n=3). Body length (from apex of head to apex of hemelytra): 13.0–14.1; greatest vertex width: 1.3–1.5; synthlipsis: 0.8–0.96; eye width: 1.6–1.8; head length: 1.3–1.5; greatest head width: 4.3-4.5; pronotum length: 1.6; greatest pronotum width: 4.6–5.1; scutellum length: 3.5–4.1; scutellum width: 4.0–4.5.

Color. Similar to holotype, except frons yellowish laterally; median region of frons and tylus brownish. Ventral surface of foretibia and tarsus brown ( Fig. 35View FIGURES 24 – 36). Hemelytra brownish, with costal region yellowish; opaque zone of membranal lobe brown, except basal lobe and apical lobe hyaline stained with brown ( Fig. 34View FIGURES 24 – 36).

External morphology. Differs from holotype by head greatest width 2.9–3.5 times its median length, 2.9–3.3 times vertex width. Vertex 1.5–1.6 times synthlipsis. Pronotum with greatest width 2.8–3.2 times its median length and slightly larger than greatest width of head; median length 1.1–1.2 times median length of head ( Fig. 34View FIGURES 24 – 36). Ventral surface of female middle femur with short and scarce pubescence ( Fig. 35View FIGURES 24 – 36).

Abdominal sternum VII broad, with apex square, truncate ( Fig. 36View FIGURES 24 – 36).

Etymology. The specific epithet is dedicated in honor of Lucas Freitas da Costa Duque, a very promising student interested in Hemiptera  ( Nepomorpha  ), who left us so prematurely.

Taxonomic notes. This species has the middle femur conspicuously setose as does Enitharoides tricomerus  ( Figs. 28View FIGURES 24 – 36, 53View FIGURES 49 – 61). However, in E. lucasduquei  the setae are shorter and limited to the apical half of the femur ( Fig. 28View FIGURES 24 – 36); whereas they cover the entire length of the middle femur of E. tricomerus  ( Fig. 53View FIGURES 49 – 61). Moreover, E. lucasduquei  has the anteapical pointed protuberance of the middle femur with straight margins ( Figs. 29, 30View FIGURES 24 – 36); margins of the metaxyphus are convex and taper towards the apex ( Fig. 31View FIGURES 24 – 36); the right paramere dorsal margin is sinuous and anteriorly emarginated dorsal and ventrally, making it somewhat projected ( Fig. 32View FIGURES 24 – 36); E. tricomerus  has the anteapical pointed protuberance of the middle femur robust with curved margins ( Figs. 54, 55View FIGURES 49 – 61); the metaxyphus margins are almost straight ( Fig. 56View FIGURES 49 – 61); the right paramere dorsal margin is straight and anteriorly truncate, curved ventrally, forming a right angle with ventral margin ( Fig. 57View FIGURES 49 – 61).