Trilobitofoenus alvarengai Macedo

Macedo, Antonio Carlos Cruz, 2009, Generic classification for the Gasteruptiinae (Hymenoptera: Gasteruptiidae) based on a cladistic analysis, with the description of two new Neotropical genera and the revalidation of Plutofoenus Kieffer, Zootaxa 2075, pp. 1-32 : 23-24

Trilobitofoenus alvarengai Macedo n. sp.

( Figs. 7 h, 11i –j, 12e, 13g, 15)

Holotype. Female. Type locality: BRAZIL: Amazonas: 71.38'W433'S, IX.1979, M. Alvarenga ( AEIC). Label: Amazonas, Brazil 71.38'W, 4.33'S IX.'79 Alvarenga.

Paratypes. Two females. Amazonas, Brazil 71.38'W, 4.33'S IX.'79 Alvarenga, 1 Ƥ ( AEIC); Estirão do Equador, R. Javari AM, BRASIL IX.1979, Alvarenga, 1 Ƥ (metasoma detached) ( MZSP).

Etymology. The name of this species is in honor of Moarcir Alvarenga, a Major in Brazilian Aeronautics who made important collections of insects and collected all examined specimens.

Diagnosis. Differs from T. plaumanni by the absence of the discal cell ( Fig. 7 h) (present in T. plaumanni ). Differs from T. sericeus by the mesoscutum striate posteriorly ( Fig. 12 e) (areolate rugose in T. sericeus ).

Description. Female. Length: 12.8 mm (11.0– 13.9 mm) (n=3); ovipositor sheath length 0.46 (0.45–0.47)X body length.

Head. Black, imbricate, with frons puncticulate, as long as wide ( Fig. 11 i); head length 1.28 (1.26–1.30)X eye length; eye length 14.40 (11.20–16.25)X malar space; distance from posterior ocellus to occipital margin 3.01 (2.86–3.17)X distance between posterior ocelli; 1st flagellomere 1.24 (1.17–1.29)X as long as scape, 2.74 (2.63–2.86)X as long as pedicel, 1.24 (1.00–1.62)X as long as 2nd flagellomere; mandible medial tooth distinct; frontal carina absent; posterior ocellus inserted at level of upper eye margin ( Fig. 11 i); occipital carina wider dorsally than laterally.

Mesosoma. Black; fore leg with coxa, trochanter and femur red brown, tibia red brown with base and apex white, 1st and 2nd tarsomeres white, remaining tarsomeres red brown; middle leg with coxa, trochanter and femur dark brown, remaining portions similar to fore leg; hind leg with coxa, trochanter, femur and tibia black, tibia with sub-basal portion yellow, tarsus white or dark brown, base of 1st tarsomere yellow; mesosoma (excluding propleuron) 1.28 (1.20–1.33)X as long as high; propleuron 1.08 (1.00–1.13)X longer than its largest wide, 0.86 (0.82–0.89)X pronotum length; metacoxa 2.09 (1.97–2.27)X as long as wide; metatibia 4.37 (3.68–5.48)X as long as wide, 1.32 (1.09–1.64)X as long as femur, 2.95 (2.56–3.69)X as long as 1st tarsomere; propleuron imbricate dorsally and sparsely punctate laterally; pronotal lobes imbricate, area between lobes crenulate ( Fig. 13 g); mesoscutum with two distinct areas, imbricate anteriorly and striate posteriorly ( Fig. 12 e); mesoscutellum imbricate; mesepisternum with dorsal portion imbricate and ventral portion areolate; mesepimeron escrobiculate; metapleuron areolate, ventral margin near middle coxa rugulose; propodeum areolate, median propodeal carina present at anterior half; fore wing discal cell absent ( Fig. 7 h), vein r–m absent; hind wing without pigmented veins; 4–5 hamuli (4/4: 66.6%, 5/4: 33.3%).

Metasoma. Predominantly dark brown, with apex of terga red brown, imbricate, 3.30 (3.19–3.37)X as long as mesosoma; ovipositor sheath dark brown, with apex yellow, 0.72 (0.70–0.73)X as long as metasoma.

Male. Unknown.

Distribution. Brazil (Amazonas) ( Fig. 15 ).

Comments. This new species is also known from a single locality. Alvarenga collected extensively in Rio Javari, a locality within a poorly known area in western Brazilian Amazon.

Figures

FIGURE 11. Head in dorsal and lateral views. a – b: Plutofoenus chaeturus; c – d: P. e d w a rd s i; e – f: P. paraguayensis; g – h: Spinolafoenus ruficornis; i – j: Trilobitofoenus alvarengai; k – l: T. plaumanni; m – n: T. sericeus. Scale bar: 1.0 mm. Numbers indicate characters and respective synapomorphic states (within brackets).

FIGURE 12. Mesonotum in dorsal view. a: Plutofoenus chaeturus; b: P. e d w a rd s i; c: P. paraguayensis; d: Spinolafoenus ruficornis; e: Trilobitofoenus alvarengai; f: T. plaumanni; g: T. sericeus. Scale bar: 1.0 mm. Numbers indicate characters and respective synapomorphic states (within brackets).

FIGURE 13. Mesosoma in lateral view. a: Gasteruption bispinosum; b: G. guildingi; c: Plutofoenus chaeturus; d: P. edwardsi, e: P. paraguayensis; f: Spinolafoenus ruficornis; g: Trilobitofoenus alvarengai; h: T. plaumanni; i: T. sericeus. Scale bar: 1.0 mm. Lobes of pronotum: vl: ventral lobe; dl: dorsal lobe; ll: lateral lobe. Numbers indicate characters and respective synapomorphic states (within brackets).

FIGURE 15. Geographic distribution of the species of Plutofoenus, Spinolafoenus and Trilobitofoenus.

FIGURE 7. a – b: Left fore wing (scale bar: 1.0 mm). a: Pseudofoenus infumatus; b: Gasteruption bispinosum; c – h: Left fore wing discal cell (without scale); c: G. bispinosum; d: G. p a r v u m; e: Plutofoenus edwardsi; f: Spinolafoenus ruficornis; g: Trilobitofoenus plaumanni; h: T. alvarengai. Numbers indicate characters and respective synapomorphic