Chalcis periotoi 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: 369-372

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Chalcis periotoi Saguiah & Tavares

sp. nov.

Chalcis periotoi Saguiah & Tavares  , sp. nov.

Figs 11View FIGURE 11 a–f, 12a–c, 13a, b

Diagnosis. Both sexes. Mesepisternum mostly smooth and shiny at upper quarter ( Fig. 11eView FIGURE 11); scape with inner face slightly sinuous ( Figs 11c, dView FIGURE 11); Fu1 1.6× as long as Fu2 length ( Fig. 11dView FIGURE 11); protarsal claws falcate ( Fig. 11fView FIGURE 11); metafemur with outer face puncticulate, interstices very wide, smooth and shiny, ventrally with outer basal tooth at most as large as and close to second tooth, the following teeth increasing in size up to the seventh tooth ( Fig. 12aView FIGURE 12); gaster dark amber ( Fig. 12cView FIGURE 12). Female. Hypopygium at apex weakly sclerotized, translucent ( Fig. 12cView FIGURE 12). Male. Antennal scape with ventral plaque on distal one-sixth; sensillum indistinct; tarsal claws not bifid; hypopygium with distal margin shallowly concave ( Fig. 13bView FIGURE 13).

Description. FEMALE. Length 6.5–6.7 mm. Color: Black, with yellow and dark amber areas as follows ( Figs 11View FIGURE 11 a–c, 12a). The following parts yellow: spot on parascrobal area ( Fig. 11cView FIGURE 11), labrum (sometimes lower face and gena), base of scape anteriorly ( Fig. 11cView FIGURE 11), fore and middle legs (except coxa and trochanter), tarsi, metacoxa dorsally and ventrally (sometimes), metatibia subbasally, pronotal collar laterally (occasionally completely), tegula, median lobe of mesoscutum posteriorly (varying from entire black to entire yellow on posterior third), mesoscutellum (sometimes black medially), propodeal callus (sometimes), irregular spot on posterior margin of upper mesepisternum (occasionally absent), and Gt3 to Gt7+8 (usually dark). The following parts dark amber: hind leg ( Fig. 11aView FIGURE 11) (except metatibia black distally and sometimes the metafemur yellow along its margins), petiole and gaster. Wings infuscate ( Figs 11a, bView FIGURE 11).

Head. Lower face not bulging above clypeus, with shallow umbilicate fovea, interstices moderately broad and finely coriaceous, somewhat shiny ( Fig. 11cView FIGURE 11); parascrobal area foveolate, interstices broad and coriaceous, median intumescence present; malar space 0.5× eye height; malar sulcus conspicuous, sinuous; internal and external carina fine and inconspicuous, complete; gena smooth to alutaceous, genal carina absent; mandibular formula 2:3 or 3:3, if 3:3 median teeth inconspicuous; antennal scrobe from smooth and shiny ventrally to confused rugulose dorsally and without transverse carina below median ocellus ( Fig. 11cView FIGURE 11); interantennal projection with median carina dorsally, carina extending slightly beyond interantennal projection. MOD:POL:APL:OOL = 0.17:0.26:0.08:0.26. Scape 4.1 4,4 × as long as wide, inner face slightly sinuous ( Figs 11c, dView FIGURE 11); anellus about 0.5× as long as wide; Fu1 longer than all other funicular segments, about 2× as long as wide and 1.6× as long as Fu2 length ( Fig. 11dView FIGURE 11).

Mesosoma  . Mesoscutum sparsely pilose, with interstices mostly smooth and shiny; in some areas broader than 2× diameter of umbilicate foveae; mesoscutellum convex, frenal carina emarginate, blade-like; mesopleuron with mesepisternum smooth and shiny dorsally, and reticulate-foveate ventrally ( Fig. 11eView FIGURE 11); propodeum with irregular median and submedian carinae, anterior and posterior costulae irregular, adpetiolar area with irregular rugae medially, anterosubmedial area irregularly areolate-rugose ( Fig. 12bView FIGURE 12); tarsomeres 4 and 5 of all legs with pubescence similar to basal tarsomeres; protarsomeres 4 and 5 ventrally without pairs of distinct peg-like spines; protarsal claws falcate, ventrally with 5 basal spines followed by 1 wide and blunt tooth ( Fig. 11fView FIGURE 11); mesocoxa slightly pubescent posteriorly; mesotibial spur 0.7× as long as the width of the mesotibial apex; metacoxa smooth and shiny dorsally, inner face glabrous; metafemur with outer face puncticulate and interstices smooth and shiny, ventrally without inner basal tooth but with 9–13 teeth along outer margin, outer basal tooth at most as large as and close to second tooth, the following teeth increasing in size up to the seventh tooth ( Fig. 12aView FIGURE 12); metatibia with apical spine triangular and as long as the apical width of metatibia; metatarsomere 1 slightly longer than any of tarsomeres 2–5. Fore wing SMV:MV:PMV = 2.33:1.02:1.09.

Metasoma. Petiole about 2.5–2.9× as long as wide, cylindrical, with dorsolateral carina at most along basal half, ventrally with weak median carina at most along distal half (sometimes bifurcate distally); hypopygial median projection apically weakly sclerotized and translucent, without set of appressed bristles, ventrally with bristles at most as long as the width of hypopygial projection in lateral view ( Fig. 12cView FIGURE 12); apex ovipositor sheath rounded apically, without some long setae ( Fig. 12cView FIGURE 12).

MALE. Length: 5.1–6.1 mm. Similar to females ( Fig. 13aView FIGURE 13), except: antennal scape with ventral plaque on distal one-sixth, sensillum indistinct; tarsal claws sharply recurved, neither bifid or pectinate; hypopygium with slightly concave surface, distal margin shallowly concave ( Fig. 13bView FIGURE 13).

Material examined. Holotype. ♀ ( UFES), ‘Uruguay, Rocha, Don Bosco, 34°05’1.07’’S 53°45’43.08’’W, bosque-campo, 15.XII.2015, Malaise 2, E. Castiglione e eq. col.’ ( UFES, nº 163888)GoogleMaps  . Paratypes (14♀, 3♂). Argentina  . Córdoba. Sierra  Córdoba, 12.II.1929, S.J. Williner col. (1♀, MACN)  . Corrientes. Ituzaingo , X.1978, Fritz col. (1♀, AMNH). Misiones. San Pedro, 2007, Lucia col. (1♀, UFES)  . Santa Fé. Rosario , 7.II.1921, J. Hubrich col. (1♀, ZSM)  . Brazil: Paraná. Foz do Iguaçu 5.XII.1966 (2♀, DZUP);  Ponta Grossa, Vila Velha , Reserva IAPAR , BR 376, Malaise, PROFAUPAR, on dates 7.XII.1987, 23.XII.1987, 30.XII.1987 (3♀, DZUP);  Ponta Grossa, Vila VelhaIAPAR , Malaise, Ganho & Marinoni, on dates 06.IX.1999, 20.XII.1999, 26.XI.2001 (3♀, DZUP).  Rio Grande do Sul. Pelotas, 18.I.1952, C.M. Biezanko col. (1♀, NHMUK).  Santa Catarina. Nova Teutônia 52°23’L 27°11’B, XI.1935, F. Plaumann col. (1♀, 2♂, NHMUK).  São Paulo. São Paulo, E. Gounelle (1♂, MNHN)  .

Biology. Unknown.

Distribution. Argentina (Córdoba, Corrientes, Misiones, Santa Fé), Brazil (Paraná, Rio Grande do Sul, Santa Catarina, S„o Paulo) and Uruguay (Rocha).

Remarks. Chalcis periotoi  is easily distinguished from the other South American species by the amber-colored hind leg, petiole and gaster ( Figs 11a, bView FIGURE 11, 13aView FIGURE 13); pronotum, mesoscutellum, fore and middle legs with large yellow areas; metafemur with outer face puncticulate, interstices very wide, smooth and shiny ( Fig. 12aView FIGURE 12); tarsal claws falcate; female hypopygium weakly sclerotized apically, translucent ( Fig. 12cView FIGURE 12); male tarsal claws not bifid.

Etymology. This species is named after Dr. Nelson W. Perioto, a colleague that has dedicated his career to the study of Neotropical Chalcidoidea.


USA, New York, New York, American Museum of Natural History


Brazil, Parana, Curitiba, Universidade Federal do Parana, Museu de Entomologia Pe. Jesus Santiago Moure




Universidade Federal do Espirito Santo


Museo Argentino de Ciencias Naturales Bernardino Rivadavia


American Museum of Natural History


Bavarian State Collection of Zoology


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


Natural History Museum, London