Chalcis ornatifrons (Cameron),

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: 365-368

publication ID

https://doi.org/10.11646/zootaxa.4885.3.3

publication LSID

lsid:zoobank.org:pub:4DA945AD-653E-4E8A-A33D-D52E2F9E44D3

DOI

http://doi.org/10.5281/zenodo.4330389

persistent identifier

http://treatment.plazi.org/id/039B87F3-FFCE-BB63-FF6F-FD37FA93FEF1

treatment provided by

Plazi

scientific name

Chalcis ornatifrons (Cameron)
status

stat rev.

Chalcis ornatifrons (Cameron)  , stat rev.

Figs 8View FIGURE 8 a–f, 9a–d, 10a –d

Smicra ornatifrons Cameron, 1909: 425  . Type Data: Mendoza. Lectotype ♀ (NHMUK type no. 5-168, images examined), lec-totype designation by Delvare (1992: 189).

Chalcis ornatifrons (Cameron)  : De Santis (1967: 214).

Chalcis pilicauda (Cameron)  : Delvare (1992: 189) (incorrect synonymy).

Diagnosis. Both sexes. Antennal scape with inner face sinuous ( Fig. 8dView FIGURE 8); metatibia with spine shorter than the apical width of metatibia ( Fig. 9bView FIGURE 9). Female. Tarsomeres 4 and 5 of all legs almost bare, pubescence very distinct from basal tarsomeres ( Fig. 8fView FIGURE 8); protarsomeres 4 and 5 ventrally with distal spines distinctly shorter than the tarsomere width ( Fig. 8fView FIGURE 8); protarsal claws only slightly curved, ventrally with 2 or 3 basal denticles followed by 3 curved setae ( Fig. 9aView FIGURE 9). Male. Ventral plaque on distal quarter of antennal scape and with indistinct elongate sensillum ( Fig. 10bView FIGURE 10); hypopygium with U-shaped distal notch, the medial portion of the notch straight ( Fig. 10dView FIGURE 10).

Description. FEMALE. Length 5.7–6.9 mm. Color: Body predominantly black, with yellow spots and some light brown areas as follows ( Figs 8View FIGURE 8 a–c, 9b). The following parts yellow (size of the yellow areas may vary): spot on parascrobal area ( Fig. 8cView FIGURE 8) (additional spot may be present on the inferior portion of the parascrobal area), interantennal projection ( Fig. 8cView FIGURE 8), posterior margin of pronotal collar ( Fig. 8bView FIGURE 8), median lobe of mesoscutum with a Vshaped spot on posterior margin, mesoscutellum posteriorly ( Fig. 8bView FIGURE 8), tegula, outer face of metafemur dorsally and anteroventrally ( Fig. 9bView FIGURE 9), metatibia subbasally ( Fig. 9bView FIGURE 9), petiole dorsally and posterolaterally, Gt1 with a medially interrupted band, Gt2–Gt6 each with a complete band. The following parts light brown: ocelli, inner face of scape, ( Fig. 8dView FIGURE 8) pedicel, flagellum ventrally ( Fig. 8dView FIGURE 8), labrum, mandibles, maxillary and labial palps, fore and middle legs, metafemur ( Fig. 9bView FIGURE 9); metatibia, tarsi, hypopygium. Wings infuscate ( Figs 8a, bView FIGURE 8).

Head. Lower face not bulging above clypeus, with elongate umbilicate fovea enclosed by diagonal irregular carinae; parascrobal area densely foveate, interstices raised as irregular diagonal rugae, median intumescence present; malar space 0.6–0.7× eye height ( Fig. 8cView FIGURE 8); malar sulcus obliterate, internal carina absent, external carinae fine and irregular, at most present near eye; gena rugose, genal carina absent; mandibular formula 2:3; antennal scrobe from coriaceous ventrally to strigulate dorsally and with transverse carina below median ocellus ( Fig. 8cView FIGURE 8); interantennal projection with median carina dorsally, carina extending to median ocellus midway. MOD:POL:APL:OOL = 0.14:0.38:0.14:0.32. Scape 4.5 – 5.2× as long as wide, inner face sinuous ( Fig. 8dView FIGURE 8); anellus about 0.5× as long as wide; Fu1 longer than all other funicular segments, about 1.3× as long as wide and 1.2× as long as Fu2 length ( Fig. 8dView FIGURE 8).

Mesosoma  . Mesoscutum with interstices coriaceous and dull, narrower than diameter of umbilicate foveae; mesoscutellum convex, frenal carina forming two sublateral lobes; mesopleuron with mesepisternum densely punctate, interstices from smooth and shiny to finely coriaceous ( Fig. 8eView FIGURE 8); propodeum with irregular median carina, submedian carina absent, anterior and posterior costulae irregular, adpetiolar area with a narrow and irregular areola medially, anterosubmedial area areolate-rugose ( Fig. 9cView FIGURE 9); tarsomeres 4 and 5 of all legs almost bare ( Fig. 8fView FIGURE 8), mostly smooth and shiny, with inconspicuous short and sparse pubescence, distinct from basal tarsomeres; protarsomeres 4 and 5 ventrally without pairs of distinct peg-like spines ( Fig. 8fView FIGURE 8), but with distal spines distinctly shorter than the tarsomere width; protarsal claws only slightly curved, ventrally with 2 or 3 basal denticles followed by 3 curved setae ( Fig. 9aView FIGURE 9); mesocoxa densely pubescent posteriorly; mesotibial spur 0.4× as long as the width of the mesotibial apex; metacoxa punctate-rugose dorsally, inner face pubescent; metafemur with outer face very densely punctate and interstices weakly coriaceous, ventrally without inner basal tooth but with 10–12 teeth along outer margin, outer basal tooth the largest and distant from second tooth, the other teeth increasing in size up to fifth tooth ( Fig. 9bView FIGURE 9); metatibia with spine triangular and shorter than the apical width of metatibia ( Fig. 9bView FIGURE 9); metatarsomere 1 slightly longer than any of tarsomeres 2–5. Fore wing SMV:MV:PMV = 1.86:0.74:0.83.

Metasoma. Petiole about 1.8–2.5× as long as wide, dorsal face flat and with dorsolateral carina along basal third (sometimes irregularly carinate), ventrally with median carina along basal half; hypopygial median projection apically with dense set of short and appressed bristles, ventrally with some bristles, the latter bristles about as long as the width of hypopygial projection in lateral view ( Fig. 9dView FIGURE 9); ovipositor sheath rounded apically, without some long setae ( Fig. 9dView FIGURE 9).

MALE. Length: 6.8 mm. Similar to females ( Fig. 10aView FIGURE 10), except: antennal scape with ventral plaque on distal quarter and with indistinct elongate sensillum ( Fig. 10bView FIGURE 10); all tarsomeres distinctly pubescent; tarsal claws bifid and pectinate ( Fig. 10cView FIGURE 10); hypopygium with concave surface and U-shaped distal notch, the medial portion of the notch straight ( Fig. 10dView FIGURE 10).

Material examined. Type material. Smicra ornatifrons  , ♀ ( NHMUK), ‘ Type’ ‘ P. Cameron Col. 1914-110’ ‘ Smicra ornatifrons Cam.  Type Mendoza [ Argentina]’ ‘B.M. Type Hym. 5.168a’ Lectotype /Delvare, 1989’ ‘[QR Code] NHMUK 013456438View Materials ’. 

Other specimens examined (11♀ and 1♂). Argentina. Córdoba. Sierra Córdoba, 8.I.1930, S.J. Williner col. (1♀, MACN)  . La Rioja. Patquía , XII.1932 - I.1933, J.J. Hayward col. (7♀, 1♂, NHMUK)  . Mendoza. Mendoza, 6.XI.1906, J. Haarup col. (1♀, NHMUK)  ; [no other data] (2♀, MACN)  .

Biology. Unknown.

Distribution. ARGENTINA (Cordoba, La Rioja, and Mendoza).

Remarks. Cameron (1909) described Octosmicra pilicauda  , Smicra ornatifrons  and S. spinicoxu  s based on differences in the distribution of yellow spots on the body and number of metafemoral teeth. Delvare (1992) considered that these differences represented intraspecific variation and placed S. ornatifrons  and S. spinicoxus  as junior synonyms of C. pilicauda  . However, we found features that indicate C. ornatifrons  and C. pilicauda  are separate species, and therefore re-establish C. ornatifrons  as a valid species. Cameron (1909) also described S. spinicoxus  based on a single male specimen, which matches the color patterns and metafemoral teeth pattern described for C. pilicauda  , described above.

Chalcis ornatifrons  differs from C. pilicauda  by the smaller body; median lobe of mesoscutum and mesoscutellum with yellow spots adjacent or fused medially ( Fig. 8bView FIGURE 8) (widely apart medially in C. pilicauda  , Fig. 14bView FIGURE 14); antennal flagellum ventrally brown ( Fig. 8dView FIGURE 8) (black in C. pilicauda  , Fig. 14dView FIGURE 14); Gt7+8 black (yellow in C. pilicauda  ); mesepisternum densely punctate ( Fig. 8eView FIGURE 8) (puncticulate-coriaceous in C. pilicauda  , Fig. 14eView FIGURE 14); metafemur ventrally with 10–12 teeth along outer margin ( Fig. 9bView FIGURE 9) (7–9 teeth in C. pilicauda  , Fig. 15bView FIGURE 15); metatibia with apical spine shorter than the apical width of metatibia ( Fig. 9bView FIGURE 9) (longer in C. pilicauda  , Fig. 15cView FIGURE 15); female tarsomeres 4 and 5 of all legs almost bare, mostly smooth and shiny ( Fig. 8fView FIGURE 8) (pubescent laterally and with the pair of distal setae in C. pilicauda  , Fig. 14fView FIGURE 14); female protarsomeres 4 and 5 ventrally with distal spines distinctly shorter than the tarsomere width ( Fig. 8fView FIGURE 8) (about as long as the tarsomere width in C. pilicauda  , Fig. 14fView FIGURE 14); female protarsal claws ventrally with 2 or 3 basal denticles followed by 3 curved setae ( Fig. 9aView FIGURE 9) (3 or 4 basal denticles followed by 3 peg-like setae in C. pilicauda  , Fig. 15aView FIGURE 15); petiole ventrally with median carina (with submedian carina in C. pilicauda  ); male antenna with ventral plaque on distal 1/4 of scape ( Fig. 10bView FIGURE 10) (on distal third in C. pilicauda  , Fig. 16bView FIGURE 16); and male hypopygium with the U-shaped distal notch transverse ( Fig. 10dView FIGURE 10) (concave in C. pilicauda  , Fig. 16cView FIGURE 16).

Among the New Word species, C. ornatifrons  and C. pilicauda  are similar to C. divisa (Walker, 1962)  and C. lasia Burks, 1940  , from Mexico and California, respectively, as they present similar yellow spot patterns (face, pronotum, mesoscutellum and metafemur), protarsal claws ventrally with few basal denticles followed by 3 setae, and similar ventral teeth along outer margin of metafemur. Chalcis lasia  differs from C. ornatifrons  and C. pilicauda  by the pronotal dorsum with yellow spot interrupted medially; mesoscutum and gaster entirely dark, without spots or bands (in males, Gt1 has one subapical yellow spot medially); profemur robust, not clavate; mesoscutellum flat and frenal lamina without sublateral lobes; metafemur with outer basal tooth not as developed; metatibial apical spine short and apically recurved toward tarsomeres; petiole dorsally with dorsolateral carina; and males with hypopygial margin shallowly concave distally, without U-shaped notch. Chalcis divisa  differs from C. ornatifrons  and C. pilicauda  by the gaster entirely red-brown, without transverse bands dorsally; mesoscutellum with median depression or central hollow, frenal carina without sublateral lobes; and ovipositor sheath obliquely truncate apically.

NHMUK

NHMUK

NHMUK

Natural History Museum, London

MACN

Museo Argentino de Ciencias Naturales Bernardino Rivadavia

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Chalcididae

Genus

Chalcis

Loc

Chalcis ornatifrons (Cameron)

Saguiah, Pâmella Machado, Molin, Ana Dal & Tavares, Marcelo Teixeira 2020
2020
Loc

Chalcis pilicauda (Cameron)

Delvare, G. 1992: 189
1992
Loc

Chalcis ornatifrons (Cameron)

De Santis, L. 1967: 214
1967
Loc

Smicra ornatifrons

Delvare, G. 1992: 189
Cameron, P. 1909: 425
1909