Cremastobaeus breviabdominus 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 : 1997-1999

Cremastobaeus breviabdominus Veenakumari sp. nov.

( Figure 2 (a–h))

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Holotype: Female. Body length = 1.22 mm; (m = 1.34 (1.22–1.47) mm, SD = 0.18, n = 2)

Colour ( Figure 2 (a))

Head and mesosoma black; metasoma maroon-brown with posterior tergites blackbrown; A1–A8 yellow-brown except A2–A4 with patches of red-brown, clava dark brown; mandibles red-brown; legs yellow except post femur with weak patches of brown.

Head ( Figure 2 (b,d,e))

FCI = 1.39; LCI = 0.93; IOS 0.44× width of head; POL>LOL>OOL in ratio of 8.3:6.3:0.6; eye large (L:W = 16.3:16.1), with dense white setae; sparse fine transverse striations in upper half of frontal depression, lateral walls smooth; vertex coriaceous reticulate, setose; gena reticulate; length and width of antennomeres A1–A 8 in ratio of 14.9:3.9, 5.6:4.2, 4.9:4.0, 3.5:2.5, 3.2:2.8, 3.1:3.0, 2.4:3.3, respectively; length and width of clava 14.1:7.2; A2–A8 with sparse, long setae; radicle 0.12× as long as A1.

Mesosoma ( Figure 2 (e–h))

Mesoscutum (L:W = 20.5:24.5) coriaceous reticulate, setose; upper lateral pronotal area reticulate, remainder smooth; netrion predominantly smooth; speculum with seven transverse striae; mesepimeral sulcus foveate; mesopleural depression smooth; ventral mesopleuron finely reticulate; metapleuron above transverse metapleural sulcus smooth and striate beneath the sulcus; paracoxal sulcus foveate; mesoscutellum (L:W = 7.7:17.6) trapezoid, coriaceous reticulate, setose; posterior mesoscutellar sulcus foveate with a wide smooth band beneath; metascutellum trapezoid (L:W = 2.1:6.8), predominantly smooth with three indistinct cells medially, laterally smooth; metanotal trough foveate; lateral propodeal area unevenly sculptured; fore wing (L:W = 72.1:26.6) and hind wing (L:W = 60.1:10.5) hyaline with dense microtrichia; length of marginal cilia of fore wing and hind wing 0.09× and 0.27× width of their wings, respectively; length of submarginalis: marginalis: stigmalis: postmarginalis in ratio of 32.9:3.8:5.2:20.3, respectively.

Metasoma ( Figure 2 (c))

(L:W = 59.6:24.7); T1 entirely costate with a crenulate anterior margin and a smooth band postero-medially; T2 with basal foveae beneath which costae extend almost entire length of tergite; space between costae smooth; T3 with a smooth band on anterior margin followed by widely spaced costae extending the entire length of tergite; space between costae smooth anteriorly and striate posteriorly; T4 and T5 similar to T3 except for additional reticulations on anterior margin beneath the smooth band; T6 coriaceous reticulate while T7 almost smooth; length and width of tergites T1–T 7 in ratio of 11.9:14.3, 10.8:19.8, 10.7:24.7, 10.2:23.5, 8.0:18.6, 4.8:12.6, 3.7:4.6, respectively; T1 longest of all tergites; T2 and T3 subequal.

Variation

The colour of the metasoma varies from maroon-brown to dark brown.

Male

Unknown.

Material examined

Holotype: Female ( ICAR / NBAIR / P1107 ), INDIA: Kerala: Eranakulam, Narakkal , 10.0467°N, 76.2174°E, 9 m, SN, 11.I.2012, FRK ; Paratype: 1 female ( ICAR / NBAIR / P1108 ), Goa: Collem , 15.3366°N, 74.2472°E, 93 m, SN, 15 .VII .2015, ARK.

Etymology

This species is named ‘ breviabdominus ’, which means short metasoma in Latin. The name is treated as an adjective.

Diagnosis

The presence of wide spaces between costae on T2–T4, which are smooth and shining, and three smooth cells on metascutellum is diagnostic of C. breviabdominus .

Figures

Figure 2. Bright field images of Cremastobaeus breviabdominus sp. nov. (female) (a) Habitus; (b) frons; (c) metasoma; (d) antenna; (e) head and mesosoma; (f) meso- and metascutellum; (g) pleuron; (h) wings.