Chalcis boi Saguiah & Tavares,

Saguiah, Pâmella Machado, Molin, Ana Dal & Tavares, Marcelo Teixeira, 2020, The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae), Zootaxa 4885 (3), pp. 353-383: 356-358

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Chalcis boi Saguiah & Tavares

sp. nov.

Chalcis boi Saguiah & Tavares  , sp. nov.

Figs 1View FIGURE 1 a–f, 2a –d

Diagnosis. Female. Malar space 0.8× eye height ( Fig. 1cView FIGURE 1); ovipositor sheath obliquely truncate apically and with some long setae ( Fig. 2dView FIGURE 2); protarsal claws only slightly curved, ventrally with 3 basal spines followed by 2 curved setae ( Fig. 1eView FIGURE 1); metatarsomere 5 slightly longer than any of tarsomeres 1–4 ( Fig. 2aView FIGURE 2).

Description. FEMALE. Length 8.8 mm. Color: Predominantly black, but with yellow, reddish-brown and golden-brown areas ( Figs 1View FIGURE 1 a–c, f), as follows. The following yellow: a round spot on parascrobal area ( Fig. 1cView FIGURE 1), a narrow basal band on protibia, first metafemoral tooth ( Fig. 1fView FIGURE 1), metatibial spine ( Fig. 1fView FIGURE 1), dorsal and posterolateral face of petiole, a transverse, short, medially interrupted band on Gt1, a spot on submedian area of Gt1 ( Fig. 2cView FIGURE 2), a transverse band on Gt2 through Gt7+8. The following reddish-brown: ocelli, labrum, mandibles, maxillary palps and labial palps, protibia anteriorly, anterior half of mesotibia, and metafemur from the base through first tooth ( Fig. 2fView FIGURE 2) and a small internal spot next to apex. Tegula, tarsi and a sub-basal portion of metatibia golden-brown. Wings infuscate ( Figs 1a, bView FIGURE 1).

Head. Lower face bulging above clypeus ( Fig. 1dView FIGURE 1), with elongate umbilicate fovea enclosed by diagonal irregular carinae ( Fig. 1cView FIGURE 1); parascrobal area densely foveate, interstices raised as irregular diagonal rugae, with a median intumescence, malar space 0.80× eye height ( Fig. 1cView FIGURE 1); malar sulcus medially inconspicuous, straight, internal and external carinae fine and irregular, absent near eye; gena rugose, genal carina not reaching vertex; mandibular formula 2:3; antennal scrobe from coriaceous ventrally to slightly strigulate dorsally and with transverse carina below median ocellus ( Fig. 1cView FIGURE 1); interantennal projection with median carina dorsally, carina extending midway to median ocellus. MOD:POL:APL:OOL = 0.21:0.48:0.36:0.17.

Mesosoma  . Mesoscutum with interstices coriaceous and dull, narrower than diameter of umbilicate foveae; mesoscutellum distinctly convex, frenal carina forming two sublateral lobes; mesopleuron with mesepisternum puncticulate-foveolate dorsally to irregularly areolate-rugulose ventrally, interstices coarsely coriaceous; propodeum with median carina well defined, submedian carina absent, anterior and posterior costulae irregular, adpetiolar area with irregular rugae medially, anterosubmedial area areolate-rugose ( Fig. 2bView FIGURE 2); tarsomeres 4 and 5 of all legs with pubescence similar to other basal tarsomeres; protarsomeres 4 and 5 ventrally without pairs of distinct peg-like spines; protarsal claws only slightly curved, ventrally with 3 basal spines followed by 2 curved setae ( Fig. 1eView FIGURE 1); mesocoxa densely pubescent posteriorly; mesotibial spur 0.3× as long as width of mesotibial apex; metacoxa punctate-rugose dorsally, inner face glabrous; metafemur with outer face very densely punctate and interstices weakly coriaceous to smooth and shiny, ventrally without inner basal tooth but with 10 teeth along outer margin, outer basal tooth the largest and distant from second tooth, the second tooth minute, the third to sixth teeth similar-sized ( Fig. 1fView FIGURE 1); metatibia with apical spine robust and longer than apical width of metatibia ( Fig. 1fView FIGURE 1); metatarsomere 5 slightly longer than any of tarsomeres 1–4 ( Fig. 2aView FIGURE 2). Fore wing SMV:MV:PMV = 1.86:0.74:0.83.

Metasoma. Petiole about 2.4× as long as wide, dorsal face flat, dorsally and ventrally without longitudinal carinae; hypopygial median projection with long bristles ventrally (about as long as the width of hypopygial projection in lateral view), and with dense set of short and appressed bristles apically ( Figs 2c, dView FIGURE 2); ovipositor sheath obliquely truncate apically, with some long setae ( Fig. 2dView FIGURE 2).

MALE. Unknown.

Material examined. Holotype. ♀ ( DZUP), ‘ Brasil, São Paulo, Cajuru, Fazenda Rio Grande , 21°12’S 47°07’W, 13.IV.2001, G.A. R. Melo & M.C. Gaglianone cols.’ (specimen missing antennae and the left foreleg).GoogleMaps 

Biology. Unknown.

Distribution. BRAZIL (S„o Paulo).

Remarks. The only known female of C. boi  is distinguished from females of C. intervalensis  , C. ornatifrons  , and C. pilicauda  by its more robust body ( Fig. 1aView FIGURE 1), the mesosoma  being entirely black ( Figs 1a, bView FIGURE 1), and the malar space being almost as long as height of an eye ( Fig. 1cView FIGURE 1). It is further distinguished by the ovipositor sheath being obliquely truncate apically ( Figs 2c, dView FIGURE 2), and metatarsomere 5 being slightly longer than any of tarsomeres 1–4 ( Fig. 2aView FIGURE 2). Among the New World species, C. boi  is similar to C. megalomis Burks, 1940  , recorded from the United States and Mexico. Females of both have the mesosoma  entirely black, the protarsal claws ventrally with basal spines followed by few curved setae, the metafemur ventrally with similar-sized teeth along the outer margin, the petiole without longitudinal carinae, and the ovipositor sheath obliquely truncate apically. However, C. boi  differs from C. megalomis  by the gaster having yellow stripes (uniformly brown in C. megalomis  ), the lower face bulging above the clypeus ( Fig. 1dView FIGURE 1) (not bulging in C. megalomis  ), the malar space 0.8× eye height (0.7× eye height in C. megalomis  ), the mesoscutellum distinctly convex (almost flat in C. megalomis  ), the metafemur stronger and longer (not as strong or long in C. megalomis  , see Burks 1940, fig. 11j), the metatibia with a robust apical spine ( Fig. 1fView FIGURE 1) (triangular and acute in C. megalomis  ), and the petiole 2.4× as long as wide (1.5× as long as wide in C. megalomis  ).

Etymology. The species epithet is a noun in apposition, from an expression in Brazilian Portuguese used in reference to very large individuals.


Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure


Departamento de Geologia, Universidad de Chile