Cremastobaeus nigrifemoralis Veenakumari, 2017

Kamalanathan, Veenakumari & Mohanraj, Prashanth, 2017, The genus Cremastobaeus Ashmead (Hymenoptera: Scelionidae: Cremastobaeini) from India, Journal of Natural History 51 (33 - 34), pp. 1989-2056 : 2025-2027

Cremastobaeus nigrifemoralis Veenakumari sp. nov.

( Figure 17 (a–h))

www.zoobank.org/ urn:lsid:zoobank.org:act:16907A9B-53E3-4E44-A162-EB0200AC59BB

Holotype: Female. Body length = 1.50 mm; n = 1

Colour ( Figure 17 (a))

Body black; A1 black, A2 black basally, remainder brown; A3–A7 brown with patches of black; A8 and clava black; coxae dark brown, femur black, tibia anteriorly yellow and posteriorly black ending with a brown patch; tarsi yellow-brown with last tarsomere black; mandible black.

Head ( Figure 17 (b,c,h))

FCI = 1.44; LCI = 1.04; IOS 0.43× width of head; POL>LOL in ratio of 10.5:6.4, lateral ocellus contiguous with orbit; eye large (L:W = 18.4:18.1), with dense white setae; frontal depression with transverse striae; vertex and gena coriaceous reticulate; length and width of antennomeres A1–A 8 in ratio of 15.9:3.3, 5.0:4.3, 6.1:3.6,

5.5:2.2, 2.9:2.4, 3.5:2.9, 3.0:4.3, respectively; length and width of clava 13.5:8.1; radicle 0.17× as long as A1.

Mesosoma ( Figure 17 (c–f))

Mesoscutum (L:W = 25.8:29.0) finely reticulate and setose; upper lateral pronotal area coriaceous reticulate, antero-ventrally reticulate, remainder smooth; netrion smooth, foveae on anterior margin spaced; speculum with several transverse striae; mesepimeral sulcus foveate; mesopleural depression smooth and ventral mesopleuron reticulate; metapleuron smooth above transverse metapleural sulcus and fully striate beneath; paracoxal sulcus foveate; mesoscutellum (L:W = 9.8:20.3) semicircular, coriaceous reticulate, setose; posterior mesoscutellar sulcus foveate with a smooth band beneath; metascutellum (L:W = 3.0:8.3), basally broad with postero-medial margin extending as a rectangular plate; metascutellum basally foveate, foveae large and with irregular sculpture in posterior half; lateral propodeal area unevenly sculptured; fore wing (L:W = 89.5:34.9) and hind wing (L: W = 75.7:13.0) hyaline with dense microtrichia; length of marginal cilia of fore wing and hind wing 0.1× and 0.33× width of their wings, respectively; length of submarginalis: marginalis: stigmalis: postmarginalis in ratio of 36.2:8.3:5.9:20.4, respectively.

Metasoma ( Figure 17 (g))

(L:W = 66.7:25.1); T1 with basal foveae, entire tergite costate; T2 with basal foveae costate the entire length, a short stria present in the space between costae; T3 costate, space between costae anteriorly smooth, but with a stria posteriorly; T4 costate, weak reticulations present anteriorly between costae; T5 similar to T4 anteriorly, remainder reticulate; T6 reticulate; length and width of tergites T1–T 7 in ratio of 13.2:16.5, 11.9:21.9, 11.9:25.1, 10.5:23.4, 8.4:19.2, 5.4:13.6, 3.9:5.4, respectively; T1 longest of all tergites, T2 and T3 equal.

Male

Unknown.

Material examined

Holotype: Female ( ICAR / NBAIR / P1167 ), INDIA: Tamil Nadu: Dindugul, Thandikudi , RCRS, 10.304°N, 77.6457°E, 1305 m, YPT, 28.XII.2016, PM.

Etymology

This species is named ‘ nigrifemoralis ’, which means ‘black femur’ in Latin referring to the unusual colouring of the femur in this species. The name is treated as an adjective.

Diagnosis

This species is distinct from all others because of the dark brown coxae, black femur, tibia anteriorly yellow and posteriorly black ending with a brown patch; tarsi yellow-brown with last tarsomere black. In all other species all legs are pale yellow to yellow-brown. In addition to this in C. nigrifemoralis the mandibles are black and the metascutellum has an unusual shape.

Figures

Figure 17. Bright field images of Cremastobaeus nigrifemoralis sp. nov. (female) (a) Habitus (dorsal view); (b) frons; (c) head and mesosoma; (d) meso- and metascutellum; (e) pleuron; (f) wings; (g) metasoma; (h) antennae.