Chalcis boi Saguiah & Molin & Tavares 2020, sp. nov.
Creators: name: Saguiah, Pâmella Machado
name: Molin, Ana Dal
name: Tavares, Marcelo Teixeira
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Chalcididae
Chalcis
Chalcis boi

description: Chalcis boi Saguiah & Tavares, sp. nov.
Figs 1 a–f, 2a–d
Diagnosis. Female. Malar space 0.8× eye height (Fig. 1c); ovipositor sheath obliquely truncate apically and with some long setae (Fig. 2d); protarsal claws only slightly curved, ventrally with 3 basal spines followed by 2 curved setae (Fig. 1e); metatarsomere 5 slightly longer than any of tarsomeres 1–4 (Fig. 2a).
Description. FEMALE. Length 8.8 mm. Color: Predominantly black, but with yellow, reddish-brown and golden-brown areas (Figs 1 a–c, f), as follows. The following yellow: a round spot on parascrobal area (Fig. 1c), a narrow basal band on protibia, first metafemoral tooth (Fig. 1f), metatibial spine (Fig. 1f), dorsal and posterolateral face of petiole, a transverse, short, medially interrupted band on Gt1, a spot on submedian area of Gt1 (Fig. 2c), 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. 2f) and a small internal spot next to apex. Tegula, tarsi and a sub-basal portion of metatibia golden-brown. Wings infuscate (Figs 1a, b).
Head. Lower face bulging above clypeus (Fig. 1d), with elongate umbilicate fovea enclosed by diagonal irregular carinae (Fig. 1c); parascrobal area densely foveate, interstices raised as irregular diagonal rugae, with a median intumescence, malar space 0.80× eye height (Fig. 1c); 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. 1c); 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. 2b); 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. 1e); 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. 1f); metatibia with apical spine robust and longer than apical width of metatibia (Fig. 1f); metatarsomere 5 slightly longer than any of tarsomeres 1–4 (Fig. 2a). 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, d); ovipositor sheath obliquely truncate apically, with some long setae (Fig. 2d).
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).
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. 1a), the mesosoma being entirely black (Figs 1a, b), and the malar space being almost as long as height of an eye (Fig. 1c). It is further distinguished by the ovipositor sheath being obliquely truncate apically (Figs 2c, d), and metatarsomere 5 being slightly longer than any of tarsomeres 1–4 (Fig. 2a). 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. 1d) (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. 1f) (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.
description: Published as part of Saguiah, Pâmella Machado, Molin, Ana Dal & Tavares, Marcelo Teixeira, 2020, The South American species of Chalcis Fabricius (Hymenoptera: Chalcididae), pp. 353-383 in Zootaxa 4885 (3) on pages 356-358, DOI: 10.11646/zootaxa.4885.3.3, http://zenodo.org/record/4296699