Cremastobaeus cornutus 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 : 1999-2002

Cremastobaeus cornutus Veenakumari , sp. nov.

( Figures 3 (a–h) and 4(a,b))

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Holotype: Female. Body length = 1.58 mm; (m = 1.58, n = 2)

Colour ( Figure 3 (a))

Head and mesosoma black; metasoma dark brown with posterior tergites black-brown; A1–A6 yellow-brown except for red tinge on A2–A4, remaining antennomeres dark brown; mandibles red-brown; legs yellow-brown.

Head ( Figure 3 (b,d,h))

FCI = 1.46; LCI = 0.92; IOS 0.43× width of head; POL>LOL in ratio of 8.9:5.3; lateral ocellus contiguous with orbit; eye large (L:W = 18.1:17.1), with dense white setae; frontal depression with short transverse striae; vertex and gena coriaceous reticulate; length and width of antennomeres A1–A 8 in ratio of 13.2:3.7, 5.9:3.9, 3.4:3.6, 2.8:2.7, 5.8:2.8, 3.0:2.9, 3.8:3.2, 3.4:4.2, respectively; length and width of clava 14.5:8.4; radicle 0.23× as long as A1.

Mesosoma ( Figure 3 (d–g))

Mesoscutum (L:W = 20.7:24.4) coriaceous reticulate, setose; lateral pronotal area dorsally reticulate remainder smooth; netrion smooth; speculum with several transverse striae; mesepimeral sulcus foveate; mesopleural depression smooth; ventral mesopleuron finely reticulate; metapleuron beneath transverse metapleural sulcus dorsally smooth, ventrally weakly striate; paracoxal sulcus foveate; mesoscutellum (L:W = 8.7:17.3) trapezoid, coriaceous reticulate, setose; posterior mesoscutellar sulcus foveate; metascutellum rectangular (L:W = 2.8:8.5), with a median furrow and two large smooth cells on either side; metanotal trough foveate; lateral propodeal area unevenly rugose; fore wing (L: W = 95.2:36.4) and hind wing (L:W = 79.4:11.6) hyaline with dense microtrichia; length of marginal cilia of fore wing and hind wing 0.08× and 0.39× width of their wings, respectively; length of submarginalis: marginalis: stigmalis: postmarginalis in ratio of 39.8:5.7:7.8:25.3, respectively.

Metasoma ( Figure 3 (c))

(L:W = 88.6:27.5); T1 with a small hump anteriorly, remainder costate except for a narrow smooth band postero-medially; T2 with basal foveae beneath which costae extend almost entire length of tergite; T3–T5 with anterior narrow smooth band, followed by weak reticulations, remainder costate the entire length of tergites; remaining tergites with uneven sculpture; length and width of tergites T1–T 7 in ratio of 16.4:15.5, 15.1:22.3, 15.7:27.5, 12.1:25.0, 12.2:19.7, 9.1:14.7, 7.7:6.8, respectively; T1 longest of all tergites followed by T3.

Male ( Figure 4 (a,b))

Similar to female. Body length = 1.509 mm; length and width of antennomeres A1–A 12 in ratio of 13.1:4.2, 4.3:4.2, 5.2:4.1, 4.6:3.6, 5.0:3.7, 5.1:3.7, 3.9:3.7, 4.8:4.0, 4.0:4.4, 4.1:4.2, 6.4:3.8, respectively.

Material examined

Holotype: Female ( ICAR / NBAIR / P1106 ), INDIA: Karnataka: Mandya, Srirangapatna , 12.4232°N, 76.6936°E, 676 m, SN, 04.I.2012, KV . Paratypes: 1 female ( ICAR / NBAIR /

P1171), Tamil Nadu: Lower Pulney Hills, Thadiyankudisai , HRS, 10.2995°N, 77.7117°E, 990 m, YPT, 27 .XI .2016, PM; 1 male ( ICAR / NBAIR / P1177 ), Arunachal Pradesh: Pasighat, College of Horticulture and Forestry ( CHF), YPT, 14 .XI .2014, KV.

Etymology

This species is named ‘ cornutus ’, which means ‘horn’ in Latin referring to the horn on T1. The name is treated as an adjective.

Diagnosis

The presence of a median furrow with a large smooth cell on either side on the metascutellum differentiates this species from all other species of Cremastobaeus possessing a horn on T1.

Figures

Figure 3. Bright field images of Cremastobaeus cornutus sp. nov. (female) (a) Habitus (dorsal view); (b) frons; (c) metasoma; (d) head and mesosoma; (e) meso- and metascutellum; (f) pleuron; (g) wings; (h) antenna.

Figure 4. Bright field images of Cremastobaeus cornutus sp. nov. (male) (a) Habitus (dorsal view); (b) antenna.