Cremastobaeus fuscus 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 : 2007-2010

Cremastobaeus fuscus Veenakumari sp. nov.

( Figures 7 (a–h) and 8(a,b))

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Holotype: Female. Body length = 1.54 mm; (m = 1.57 (1.40–1.73) mm, SD = 0.13, n = 4) Colour ( Figure 7 (a))

Head and mesosoma black; metasoma dark brown-black; A1–A4 brown except for red tinge on A2–A4; A5–A7 yellow-brown, A8 and clava dark brown; eyes black; mandibles red-brown; legs yellow-brown except for dark brown last tarsomere.

Head ( Figure 7 (b,c,h))

FCI = 1.37; LCI = 1.0; IOS 0.47× width of head; POL>LOL in ratio of 10.1:6.2; lateral ocellus contiguous with orbit; eye large (L:W = 18.0:17.6), with not so dense white setae; frontal depression with uneven transverse striations; vertex and gena coriaceous reticulate; length and width of antennomeres A1–A 8 in ratio of 16.0:3.7, 5.9:4.1, 6.2:4.0, 4.7:3.2, 3.9:3.5, 4.3:3.5, 3.2:4.7, respectively; length and width of clava 15.3:7.7; radicle 0.14× as long as A1.

Mesosoma ( Figure 7 (c,d, f,g))

Mesoscutum (L:W = 23.7:27.1) with imbricate sculpture and dense long setae; upper lateral pronotal area reticulate remainder smooth; netrion smooth; speculum with

several transverse striae; mesepimeral sulcus foveate; mesopleural depression smooth; ventral mesopleuron weakly reticulate; metapleuron above transverse metapleural sulcus smooth; dorsal metapleuron beneath transverse metapleural sulcus smooth, remain- der striate; paracoxal sulcus foveate; mesoscutellum (L:W = 9.1:17.0) trapezoid, coriaceous reticulate, setose; posterior mesoscutellar sulcus foveate; metascutellum rectangular (L:W = 3.5:7.6), foveate on anterior margin, remainder unevenly rugose; metanotal trough foveate; lateral propodeal area predominantly smooth with foveae on posterior margin; fore wing (L:W = 87.3:32.9) and hind wing (L:W = 72.9:11.6) hyaline with dense microtrichia; length of marginal cilia of fore wing and hind wing 0.07× and 0.34× width of their wings, respectively; length of submarginalis: marginalis: stigmalis: postmarginalis in ratio of 35.8:5.6:7.4:27.3, respectively.

Metasoma ( Figure 7 (e))

(L:W = 82.6:27.8); anterior margin of T1 visible when viewed dorsally; T1 with a short broad horn anteriorly; horn costate medially and laterally smooth; remainder costate; T2 with basal foveae beneath which costae extend the entire length of tergite; T3 anteriorly reticulate, remainder costate; T4 same as T3; T5 costate with sparse reticulations on anterior margin; remaining tergites with uneven sculpture; T6 medially smooth and laterally reticulate; length and width of tergites T1–T 7 in ratio of 17.6:17.4, 13.1:23.0, 13.2:27.2, 12.4:25.7, 11.2:22.2, 9.9:17.4, 5.6:6.9, respectively; T1 longest of all tergites; T2 and T3 subequal in length.

Male ( Figure 8 (a,b))

Body length = 1.466 mm; similar to female; length and width of antennomeres A1–A 12 in ratio of 14.0:3.8, 5.0:4.6, 7.0:4.6, 4.4:3.9, 4.8:3.9, 4.9:4.1, 4.6:4.5, 4.0:4.4, 4.2:4.4, 4.3:4.9, 6.1:4.8, respectively; antennomeres more globular in shape compared with antennomeres in males of other species such as C. varuna and C. yoganarasimha .

Material examined

Holotype: Female ( ICAR / NBAIR / P1082 ), INDIA: Karnataka: Bengaluru, Hebbal , National Bureau of Agricultural Insect Resources ( NBAIR), 13.0270°N, 77.5842°E, 927 m, MT, 07. XII.2011, KV . Paratypes: 1 female ( ICAR / NBAIR / P1083 ), Tamil Nadu: Pechiparai , 8.1423°N, 77.2004°E, 58 m, SN, 11 .XI .2011, KV; 1 female ( ICAR / NBAIR / P1084 ), Tamil Nadu: Dharmapuri, Hosur, Uddanapalli , 12.6020°N, 77.9469°E, 758 m, MT, 05 .II .2015, PM; 1 female ( ICAR / NBAIR / P1172 ), Karnataka: Bengaluru, Hesaraghatta , 13.1394°N, 77.4854°E, 859 m, YPT, 09 . VI .2010, KV; 1 male, ( ICAR / NBAIR / P1173 ), Odisha: Puri, Chandanpur , 19.8872°N, 85.8140°E, 14 m, YPT, 29 .XI .2007, PM.

Etymology

This species is named ‘ fuscus ’, which means ‘dark brown’ in Latin referring to the dark brown metasoma. The name is treated as an adjective.

Diagnosis

This species is closer to C. varuna but differs from it in the following character states: in C. fuscus the metascutellum is unevenly rugose without a broad median carina and T6 is with uneven sculpture whereas in C. varuna the metascutellum is smooth with a broad

median carina and T6 is finely reticulate in the upper half, the remainder is smooth. In addition to this the colour of T1 is also different.

Figures

Figure 7. Bright field images of Cremastobaeus fuscus sp. nov. (female) (a) Habitus (dorsal view); (b) frons; (c) head and mesosoma; (d) meso- and metascutellum; (e) metasoma; (f) wings; (g) pleuron; (h), antenna.

Figure 8. Bright field images of Cremastobaeus fuscus sp. nov. (male) (a) Habitus (dorsal view); (b) antennae.