Calymmochilus bini Fusu, 2018

Fusu, Lucian, Askew, Richard R. & Ribes, Antoni, 2018, Rediscovery of Calymmochilus russoi Gibson, 1995 (Hymenoptera, Chalcidoidea, Eupelmidae), and revision of European Calymmochilus Masi, 1919, Zootaxa 4504 (4), pp. 501-523 : 508-509

Calymmochilus bini Fusu sp. n.

Figs 20–29 (♀)

Etymology. Named in honour of the late Italian entomologist Ferdinando Bin who collected the holotype.

Diagnosis. Female. Macropterous. Mesosoma and head concolorous, dark brown with reduced metallic lustre ( Fig. 20 ); gaster with mostly white to hyaline Gt1, and largely yellow Gt7 (syntergum) with a brown stripe running laterally from cercus to near the apex ( Fig. 23 ), otherwise variably brown and Gt2 to Gt5 with a darker rim along distal margin resulting in a banded pattern ( Fig. 20 ). Legs almost uniformly yellow to yellow-brown with coxae slightly darker; scape yellow-brown. Head not conspicuously modified, convex, with lower parascrobal region passing smoothly into gena ( Fig. 27 ). Clypeus protuberant, convex, apically serrate ( Fig. 27 ). Scrobal depression deep, with sloping, non-carinate sides, smooth and shiny except imbricate-reticulate along outer margin ( Fig. 27 ). Frontovertex between ocellar triangle and scrobal depression reticulate ( Fig. 29 ). Mesoscutum reticulate virtually to posterior margin ( Fig. 25 ). Mesoscutellum and axillae differentiated and distinct, scutellum slightly convex ( Fig. 25 ). Acropleuron comparatively more superficially reticulate, mesally reticulate-coriaceous, with cells delimited by only slightly raised ridges ( Fig. 22 ). Fore wing clear except for darker base ( Fig. 28 ).

Male. Unknown.

Description. Female. Length 1.7 mm. Colour. Head of holotype dark brown with faint coppery, violet and blue lusters manly on upper face ( Fig. 27 ). Maxillary and labial palps pale yellow. Antenna ( Fig. 26 ) with scape yellow-brown, pedicel and flagellum brown with faint green metallic lustre when viewed from some angles, except pedicel apically and sensorial region of clava off-white to brown-yellow. Mesosoma ( Figs 20–22 ) dark brown with faint metallic lustre similar to head. Legs ( Fig. 20 ) with coxae brown except paler apically and mesocoxa lighter; yellow beyond coxae with posterior surface of front femur slightly darker, brown-yellow. Fore wing clear except narrowly infuscate basally ( Fig. 28 ); venation pale yellow with basal half of submarginal vein light brown. Metasoma mainly dark brown with faint metallic lustre except for the following: Gt1 lateroventrally and hypopygium off-white to translucent ( Fig. 20 ); Gt2 to Gt5 with a darker rim along distal margin resulting in a banded pattern ( Fig. 20 ); Gt6 light brown ( Fig. 24 ); Gt7 (syntergum) dark yellow with a brown stripe extending laterally from cercus to near apex ( Fig. 23 ). Ovipositor sheaths yellow ( Fig. 23 ).

Structure and setation. Head not conspicuously modified, convex, with lower parascrobal region passing smoothly into gena; in dorsal view 2.0× as long as broad, with interocular distance 0.4× head width; in frontal view 1.1× as broad as high. Ocelli arranged in an obtuse triangle ( Fig. 29 ); OOL: POL: LOL: MPOD = 1.7: 2.6: 1.2: 1.0. Scrobal depression deep, slightly bell-shaped, with sloping, non-carinate sides ( Fig. 27 ). Clypeus elongated, convex, apically serrate, with three upcurved teeth on each side ( Fig. 27 ). Frontovertex between ocellar triangle and scrobal depression reticulate ( Fig. 27 ). Scrobal depression smooth and shiny except imbricate-reticulate along outer margin. Lower parascrobal region with inconspicuous hair-like setae, similar to rest of head. Torulus separated from mouth margin by about 1.2× torulus height. Antenna with combined length of pedicel + flagellum about 1.4× head width; scape about 6.9× as long as maximum width, in outer view with subparallel edges; pedicel in lateral view about 2.0× as long as wide; fl1 subquadrate and about 0.6× as long as fl2; following flagellomeres of similar length but gradually wider; clava as wide as fl8 and as long as fl5–fl8 combined. Pronotum covered by occiput and not visible. Mesoscutum ( Fig. 25 ) almost uniformly reticulate except very narrowly imbricatecoriaceous along posterior margin, with sparse, suberect off-white setae. Mesoscutellum and axillae flattened and in same plane, reticulate; setose as mesoscutum. Propodeum ( Fig. 25 ) with wide and long plical and callar regions, the plical region with a pair of anteriorly ^-like converging carinae running along inner margin of callar furrow; plical depression very small and overlain by a narrow median protuberance of metascutellum; callar region mostly asetose but with a small group of long white setae along outer margin. Acropleuron comparatively superficially reticulate, mesally reticulate-coriaceous, with cells delimited by only slightly raised ridges ( Fig. 22 ). Fore wing 2.5× as long as wide, costal cell: marginal: postmarginal: stigmal veins = 3.4: 2.4: 1.2: 1.0. Costal cell largely asetose but dorsal surface with a group of light brown setae in front of parastigma and ventral surface with two rows of light-brown setae along length; basal cell setose similar to disk; disk entirely covered with light brown setae. Mesotarsus with an even row of pegs along each side of basal three tarsomeres and a single peg apically on each side of fourth tarsomere. Gaster imbricate-coriaceous to reticulate with sparse inconspicuous setae. Ovipositor sheaths not surpassing Gt7 (syntergum).

Remarks. In the colour of the syntergum the female of C. bini is most similar to the C. delphinus female (cf. Figs 23, 31 ). In addition to the differences mentioned in the key, the unique female holotype of C. bini has a light brown Gt6 ( Fig. 24 ) that although lighter than preceding tergites is not as light as the mostly yellow Gt7 (syntergum). In C. delphinus both Gt6 and Gt7 are concolorous and mostly yellow ( Fig. 31 ). Additional specimens of C. bini are needed to ascertain if this difference is reliable in separating the two species. Also, the mesoscutum and mesoscutellar-axillar complex are less deeply reticulate than in C. delphinus females, but this is difficult to quantify or use as an identification feature without comparative material at hand.

Distribution. Italy (Sardinia).

Type material. ITALY: Holotype ♀: “ Sardinia / Tempio (Cuss-/ eddu) viii-1978 / F. Bin | HOLOTYPUS ♀ / Calymmochilus / bini sp. nov. / Det. Fusu L. 2017” ( CNC). Condition of the holotype: entire, uncontorted, glued to a point by the right acropleuron.

Figures

FIGURES 20–32. 20–29, Calymmochilus bini, holotype ♀: 20, lateral habitus; 21, dorsal habitus; 22, mesosoma, lateral; 23, syntergum, lateral; 24, syntergum, dorsal; 25, mesosoma, dorsal; 26, antenna; 27, head, two-thirds; 28, fore wing; 29, head, dorsal. 30–32, C. delphinus: 30, mesosoma, lateral (2017-27); 31, syntergum, lateral (2017-27); 32 head, frontal (2017-09). Scale bars represent 1 mm in 20, 21 and 0.2 mm in 22–32.