Dyscritobaeus madagascarensis 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 : 25-29

publication ID

http://doi.org/10.11646/zootaxa.4178.1.1

publication LSID

lsid:zoobank.org:pub:D00D1335-72DF-4D8B-97E1-45642CF38AC8

DOI

http://doi.org/10.5281/zenodo.6084483

persistent identifier

https://treatment.plazi.org/id/493AA8D4-D4A1-4FF5-BF06-076C91289FBE

taxon LSID

lsid:zoobank.org:act:493AA8D4-D4A1-4FF5-BF06-076C91289FBE

treatment provided by

Plazi

scientific name

Dyscritobaeus madagascarensis Tortorici et Caleca
status

sp. nov.

Dyscritobaeus madagascarensis Tortorici et Caleca   sp. nov.

(Figs 12, 19, 38c, 38f, 43, 65, 66, 67, 68, 69, 70, 71)

urn:lsid:zoobank.org:act:493AA8D4-D4A1-4FF5-BF06-076C91289FBE http://hol.osu.edu/index.html?id=410569

Diagnosis. The dorsal tooth is 4 times as long as the ventral tooth in both sexes, which distinguishes D. madagascarensis   and D. antananarivensis   from the other Afrotropical species. Presence of the preoccipital lunula ( Fig. 15 View FIGURE 15 ) distinguishes this species from D. comitans   and D. ndokii   . The drop-shaped T2 specillum in females (Fig. 12, 69) and equal length of female A 11 and A 12 distinguish this species from D. sulawensis   . The specillum is absent in males ( Fig. 70 View FIGURES 69 – 71 ) as in D. sulawensis   . The male of this species differs from D. antananarivensis   by the position of the sex segment keel (in the middle of fifth antennomere, Fig. 43 View FIGURES 42 – 43 ), OOL/POL= 1, T2 without specillum, T3 with short striae (in D. antananarivensis   : the sex segment keel is in the distal part of antennomere as in Fig.42 View FIGURES 42 – 43 , OOL/POL= 0.78, T2 with specillum and T3 without striae as in Fig. 62 View FIGURES 60 – 63 ); the male differs from D. sulawensis   by the distance between the lateral ocellus and occipital carina as being equal to the diameter of the ocellus, the occipital carina is less depressed at vertex and shape and by the size of the mandible teeth ( Fig. 68 View FIGURES 65 – 68 ) (in D. sulawensis   : the distance between the lateral ocellus and occipital carina is less than the ocellus diameter; the occipital carina is depressed at the vertex and the mandible dorsal tooth is as long as the ventral tooth, as in Fig 74 View FIGURES 73 – 78 ).

Description. Female. Length of the body: 1.23 mm

Head. Color, dark brown. Coriaceous, frontal depression with a smooth area starting from the interantennal process and reaching the mid eye height ( Fig. 65 View FIGURES 65 – 68 ). Central keel reaching the eye level ( Fig. 65 View FIGURES 65 – 68 ). Fan-like striation in malar area from oral foramen to eye margin, short striation is also present in genal area ( Fig. 67 View FIGURES 65 – 68 ). Preoccipital lunula present and sculptured ( Fig. 69 View FIGURES 69 – 71 ). Measures of the head width: height: length = 0.5: 0.44: 0.26 mm. Malar sulcus length: 0.12 mm. Ratio of eye width: heigth = 0.17: 0.24 mm. OOL: LOL: POL = 0.1: 0.06: 0.11 mm. Distance lateral ocellus to occipital carina = 1 ocellar diameter. Mandibles bidentate with dorsal tooth 4 time longer than ventral one ( Fig. 67 View FIGURES 65 – 68 ).

Antenna. A 1 to A 7 yellowish   , A 8 to A 12 brown   . A 1 length: 0.23 mm   ; A 2 longer as A 3+ A 4. Clava sixsegmented   ; A 11 is as long as A 12 (Fig. 19). Claval sensilla formula 1:2:2:2:1:0.  

Mesosoma. In dorsal view, mesoscutum and mesoscutellum dark brown with posterior mesoscutellar margin yellowish; propodeum dark red. ( Fig. 69 View FIGURES 69 – 71 ). In lateral view, pleurae dark red ( Fig. 71 View FIGURES 69 – 71 ).

In dorsal view mesoscutum and mesoscutellum imbricate. In lateral view speculum with furrow, femoral depression smooth, posterior mesepimeral area delimitate anteriorly by a mesepimeral sulcus with a crenulate furrow, dorsal metapleural area with crenulate depression with rugae, ventral metapleural area smooth ( Fig. 71 View FIGURES 69 – 71 ). Metapleural carina with two pointed projections, one adjacent to propodeal spiracle and second one at posterior margin. Metascutellum visible in dorsal view, triangular, and large metanotal spine, slightly surpassing propodeum ( Fig. 69 View FIGURES 69 – 71 ). Mesonotum length 0.29 mm, width 0.47 mm; mesoscutellum length 0.16 mm, width 0.35 mm.

Wings. Fore wing hyaline, surpassing metasoma; st length 0.12 mm and ratio st: pm: mg: sm: ww: lw: af: pf = 1: 1.2: 0.3: 3.3: 3.2: 7.8: 0.2: 0.9; angle st-pm= 20° as in Fig 38e View FIGURES 38 a – f .

Legs yellow, except coxae dark yellow.

Metasoma. 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 ( Fig. 69 View FIGURES 69 – 71 ). T2 with foveolate anterior margin; costulate to colliculate, drop shaped specillum in the middle of T2, costae converging to posterior margin of specillum (Fig. 12). T3 with costae long ½ of T3 ( Fig. 69 View FIGURES 69 – 71 ).

Male. Length of the body: 1,1 mm

Head. Sculpture as in female. Frontal depression shallower than in female, central keel as in female ( Fig. 66 View FIGURES 65 – 68 ). Fan-like striation in malar area from oral foramen to eye margin, striation just evident in genal area ( Fig. 68 View FIGURES 65 – 68 ). Measures of the head width: height: length = 0.45: 0.38: 0.20 mm. Malar sulcus length: 0.11 mm. Measures of eye width: heigth = 0.16: 0.2 mm. OOL: LOL: POL = 0.09: 0.06: 0.09 mm. Mandibles as in female ( Fig. 68 View FIGURES 65 – 68 ).

Antenna: A1 and A2 yellow, A3 to A12 brown. Sex segment with spine in the middle of antennomere ( Fig. 43 View FIGURES 42 – 43 ). A12 length twice A11 length.

Mesosoma. Color and sculpture as in female. Mesonotum length 0.29 mm, width 0.43 mm; mesoscutellum length 0.15 mm, width 0.31 mm ( Fig. 70 View FIGURES 69 – 71 ).

Wings. Fore wing hyaline, surpassing metasoma; st length 0.12 mm and ratio st: pm: mg: sm: ww: lw: af: pf = 1: 1.3: 0.4: 3.0: 3.2: 7.8: 0.1: 0.6; angle st-pm= 24° as in Fig. 38f View FIGURES 38 a – f .

Metasoma. tergites brown. Sculpture as in female except T2: longitudinal parallel costae, specillum not present. T3 striate as in female ( Fig. 70 View FIGURES 69 – 71 ).

Comment and variability. Sixteen specimens were examined from Madagascar.

The size of the body is very homogenous in all the specimens, female occasionally completely brown.

A bidentate mandible with the dorsal tooth stronger and longer than the ventral tooth is a character state typical of many Dyscritobaeus   species from the Oriental, Australian, Neotropical and Nearctic regions. This character state is present in only two Malagasy species and is absent in all species from the African continent.

The absence of a specillum in males confirms the presence of sexual dimorphism in respect of the T2 sculpture as in D. sulawensis   and D. comitans   .

Distribution. ( Fig. 72 View FIGURE 72 ).

Etymology. The name of the species is linked to the island where the specimens were collected. Material examined. Holotype. ♀: AFRICA: Madagascar: Ranomafana Nat. Park, 21°14'51''S, 47°24'13''E, 1079m, 2010/11/16 – 2010/11/18, P. Bañař, sifting, ( CNCI), [ CNC 471138].

Allotype. Ƌ: AFRICA: Madagascar: Ranomafana Nat. Park, 21°14'51''S, 1079m, 2010/11/16   – 2010/11/18, P. Bañař, sifting, (CNCI), [CNC 471150].

Paratypes. AFRICA: Madagascar: 40km N. Ambilobe, 1♀, 1981/09/19, J. Wilson, ( BMNH), [ BMNH (E)#971570]; Antsiranana, Marojejy Res., 8.4km NNW Manantenina , 14°26'S 49°45'E GoogleMaps   , 700m, 2♀, 1Ƌ, 1993/11/ 10 – 1993/11/16, C. Griswold, J. Coddington, N. Scharff, S. Larcher, R. Andriamasimanana, (CNCI), [CNC 471143, 471144, 471145]; CE Andasibe Nat. Park, 1♀, 2010/11/03 – 2010/11/06, P. Bañař & L. S. Rahanitriniaina, Circuit Indri 2 sifting, (CNCI), [CNC 471152]; Montagne d'Ambre Nat. Park, 1100m, 2♀, 4Ƌ, 2010/10/30, P. Bañař, sifting, (CNCI), [CNC 471139 (♀, wings on slide, Fig. 38e View FIGURES 38 a – f ), 471140, 471146, 471147, 471148, 471149 (Ƌ, wings on slide, Fig. 38f View FIGURES 38 a – f )]; Ranomafana Nat. Park, 21°14'51''S 47°24'13''E, 1079m, 2♀, 1Ƌ, 2010/11/16 – 2010/11/18, P. Bañař, sifting, (CNCI), [CNC 471141, 471142, 471151].

CNCI

Canadian National Collection Insects

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes