Dyscritobaeus antananarivensis Tortorici et Caleca

Tortorici, Francesco, Caleca, Virgilio, Noort, Simon Van & Masner, Lubomir, 2016, Revision of Afrotropical Dyscritobaeus Perkins, 1910 (Hymenoptera: Scelionidae), Zootaxa 4178 (1), pp. 1-59 : 23-24

Dyscritobaeus antananarivensis Tortorici et Caleca sp. nov.

( Figs 33 , 38d , 42 , 60, 61, 62, 63 )

urn:lsid:zoobank.org:act:449C0 A 01-DB17-45E2-892E-76 EADAA 63 AD0 http://hol.osu.edu/index.html?id=410565

Diagnosis. This species is easily distinguished from D. comitans and D. ndokii by the presence of the occipital lunula and specillum in males. The species can be differentiated from D bicolor , D. flavus , D. ndokii and D. parvipennis by the dorsal tooth, which is 4 times longer than the ventral tooth, pm> st ( Fig. 38d ), a triangular metascutellum and long metanotal spine, metapleural carinae with two pointed projections and specillum present in males; furthermore it differs from D. ndokii , also by an anteriorly well delimited posterior mesepimeral area ( Figs 63 ). Dyscritobaeus antananarivensis differs from D. sulawensis and D. madagascarensis by the sex segment keel on the distal part of fifth antennomere ( Fig. 42 ), OOL/POL= 0.78, T2 with specillum and T3 without striae ( Fig. 62 ); it also differs from D. sulawensis by the large dorsal tooth of the mandible, which is 4 times as long as than the ventral tooth ( Fig. 61 ).

Description. Male. Length of the body: 0.75 mm

Head. Color, light brown. Coriaceous, frontal depression with a smooth area starting from the interantennal process and reaching the mid eye height, central keel surpassing the eye level ( Fig. 60 ). Fan-like striation in malar area from oral foramen to eye margin, striation just evident in genal area. Preoccipital lunula present and sculptured ( Fig. 62 ). Measures of the head width: height: length = 0.31: 0.27: 0.16 mm. Malar sulcus length: 0.08 mm. Measures of eye width: heigth = 0.1: 0.13 mm. OOL: LOL: POL = 0.07: 0.05: 0.9 mm. Distance lateral ocellus to occipital carina less than ocellar diameter. Mandibles bidentate with dorsal tooth 4 time longer than ventral one ( Fig. 61 ).

Antenna. A 1 – A 12 brown ; A 12 length twice A 11 length. Sex segment with keel in the distal part of antennomere ( Fig. 42 ).

Mesosoma. In dorsal view, mesoscutum, scutellum and propodeum light brown. ( Fig. 62 ). In lateral view, pleurae light brown ( Fig. 63 ). In dorsal view mesoscutum and mesoscutellum coriaceous. In lateral view speculum with furrow, femoral depression smooth, posterior mesepimeral area delimitate anteriorly by a mesepimeral sulcus with a crenulate furrow, dorsal and ventral metapleural area with crenulate depression with rugae ( Fig. 63 ). Metapleural carina with two pointed projections, one adjacent to propodeal spiracle and second one at posterior margin. Metascutellum visible in dorsal view, triangular; large metanotal spine, slightly surpassing propodeum ( Fig. 62 ). Mesonotum length 0.18 mm, width 0.28 mm; mesoscutellum length 0.09 mm, width 0.19 mm.

Wings. Fore wing hyaline, surpassing metasoma; wing ratio st: pm: mg: ww: af: pf = 1: 1.0: 0.4: 2.9: 0.3: 0.8; angle st-pm= 28° as in Fig. 38d . st length is 0.08 mm.

Legs yellow, except coxae dark yellow.

Metasoma. ( Fig. 62 ). In dorsal view, tergites brown, in ventral view sternites brown, laterotergites light brown. On T1 pair of longitudinal submedial carinae are aligned with the metapleural carinae. They separate a lateral coriaceous area from an internal area where striate sculpture starts with basal grooves and finishes to coriaceous. T2 with foveolate anterior margin; costulate to colliculate, drop shaped specillum in the middle of T2 not well delimitated at sides and on top; costae converging to posterior margin of specillum ( Figs 33 , 62 ). T3 without striae.

Comment. The species is represented by only a single male specimen. The combination of character states represented by the presence of a specillum in male and a long dorsal tooth, which is 3-4 times as long as the ventral tooth is unusual in Afrotropical species, but this character combination is commonly represented in Dyscritobaeus species from the Oriental region.

Distribution. ( Fig. 64 )

Etymology. The name of this species is linked to the locality Antananarivo where the type was collected. Material examined. Holotype. Ƌ: AFRICA: Madagascar: 25km W. Tananarive, 1983/05/24 – 1983/05/29, J. Noyes & M. C. Day, (BMNH), [BMNH (E)#971551] (wings on slide, in Fig. 38d ).

Figures

FIGURE 33. Dyscritobaeus. antananarivensis Tortorici et Caleca sp. nov. Ƌ holotype: T 2 with drop-shaped specillum; FIGURE 34. D. sulawensis Ƌ from Central African Republic: T 2 without specillum, costae slightly curving in the middle and converging at posterior margin.

FIGURE 64. Distribution of Dyscritobaeus antananarivensis Tortorici et Caleca sp. nov.

FIGURES 38 a – f. Fore wings: a — Dyscritobaeus comitans ♀, from Sulawesi; b — D. comitans Ƌ, from Sulawesi; c — D. ndokii Tortorici et Caleca sp. nov. holotype Ƌ; d — D. antananarivensis Tortorici et Caleca sp. nov. holotype Ƌ; e — D. madagascarensis Tortorici et Caleca sp. nov. ♀; f — D. madagascarensis Tortorici et Caleca sp. nov. Ƌ.

FIGURES 42 – 43. Different shape of sex segment (male fifth antennomere) in Malagasy species: 42 — Dyscritobaeus antananarivensis Tortorici et Caleca sp. nov. holotype Ƌ; 43 — D. madagascarensis Tortorici et Caleca sp. nov. allotype Ƌ.

FIGURES 60 – 63. Dyscritobaeus antananarivensis Tortorici et Caleca sp. nov. Ƌ, holotype [BMNH (E) # 971551]: 60 — head, frontal view; 61 — mandibles, ventral view; 62 – head, mesosoma and metasoma, lateral view; 63 — head, mesosoma and metasoma, lateral view.