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Dicopomorpha zebra ( Dutch; Flemish )

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Insecten

Dicopomorpha zebra is een vliesvleugelig insect uit de familie Mymaridae. De wetenschappelijke naam is voor het eerst geldig gepubliceerd in 2009 door Huber.

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Geplaatst op:
12-04-2013
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Description

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Description. Female. Body length 285–585 (n = 8, critical point dried specimens). Body (Fig. 1) shiny dark brown dorsally, with a faint but distinct mother-of-pearl (blue and green) sheen, especially on vertex and dorsum of mesosoma; head below eyes and between toruli yellowish; gaster lighter ventrally; coxae, trochanters, and parts of femora and tarsi lighter, almost white; scape with two transverse white bands; pedicel white.
Head (Figs 3, 4). Head width 1.4 × length, and length about 1.0 × height. Sculpture generally reticulate but shallow on face and gena, very faint on polished vertex (Fig. 3). Face in lateral view (Fig. 4) strongly angular and produced forward of anterior margin of eye, with a slightly undulating, sharp-edged junction separating a short, almost horizontal dorsal surface (bearing the toruli) from a strongly receding ventral surface. Vertex (Fig. 3) slightly curving to transverse trabecula anteriorly, its posterior margin concave and forming a sharp angle with occiput; median ocellus about its own diameter from posterior margin of vertex, lateral ocelli at posterolateral corners of vertex. Eye large, extending posteriorly to occiput in dorsal third, separated ventrally from occiput by increasingly widened gena; malar space slightly less than half eye height, with 2 setae. Face with 2 setae on dorsal surface between toruli, 2 setae on ventral surface sublaterally just below junction with dorsal surface, and about 5 setae laterally along margin with eye and malar space; vertex with 2 minute setae behind median ocellus and 1 longer seta next to each lateral ocellus; occiput with 1 submedian dorsal setae just ventral to junction with vertex.
Antenna (Fig. 5). Scape usually with a prominent bulge ventrally in basal third beyond radicle, then narrowing to apex; radicle not separated from scape by a groove; pedicel almost 2x as long as wide; funicle 7-segmented; fl2 quadrate, much shorter than remaining funicle segments, in particular fl1 and fl3; clava as long as fl4–fl7 and fairly wide. Measurements (length/width) of antennal segments (holotype): scape 206/47, pedicel 51/30, fl1 50/11, fl2 11/11, fl3 57/14, fl4 40/15, fl5 43/17, fl6 34/15, fl7 37/19, clava 154/55. Clava with 3 longitudinal sensilla.
Mesosoma (Figs 1, 3, 4). Length slightly greater than width, with sculpture very faint, at most moderately visible on posterior scutellum (Fig. 3); most setae minute, barely visible. Pronotum extremely short and almost membranous medially, not visible in dorsal view (Fig. 3); mesoscutum shiny (Fig. 3), with very faint sculpture, the lateral lobe prominent with 1 seta at lateral angle, and midlobe with 1 seta medially and 1 seta posteriorly near notaulus; axilla with 2 setae medially and posteriorly; anterior scutellum slightly longer than posterior scutellum medially, but shorter laterally, with the placoid sensilla widely separated and 1 seta just lateral to each sensillum; dorsellum short, about one-third length of posterior scutellum; propodeum short, slightly more than half length of posterior scutellum, the propodeal seta less than two spiracle diameters from spiracle.
Wings (Fig. 6). Fore wing with brown suffusion except behind base of marginal vein and an oval clear area beyond venation in apical quarter, disc without microtrichia except for the usual two rows along anterior and posterior margins. Hypochaeta near apex of submarginal vein; proximal macrochaeta absent, distal macrochaeta at apex of marginal vein at point where vein thins as stigmal vein. Hind wing with uniform brown suffusion, the membrane slightly and gradually widening towards rounded apex, with 1 row of microtrichia along hind margin. Fore wing length (holotype) 573, width 60, longest marginal setae 199, venation length 200. Hind wing length 569, width 19, longest marginal setae 154, venation length 150.
Legs. Normal, with 5 tarsomeres.
Metasoma (Figs 3, 4). Slightly shorter than mesosoma, in dorsal view almost globular but with a distinctly sloping anterior face separated by a sharp ridge from posterodorsal face; the terga in dorsal view (Fig. 3) strongly oblique, arranged in a V-shaped pattern and except for gt7 appearing divided medially; with about 12 setae (2 on each of gt2–gt6, apparently) along the sharp ridge; cercal setae long (about 255) and curved; spiracle apparently absent. Ovipositor 345, equal in length to metatibia.
Male. Body length 426 (n=1, critical point dried). Body brown except gaster light brown and base of scape white. Antennal length 1064, 2.5 times length of entire body, apparently with 9 flagellar segments; each flagellomere about 5 × as long as wide; fl4 length100.
Variation. Three of the paratypes from Lamto have the scape narrower basally and the white bands less distinct (Fig. 1) than in the other types.
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The genus Dicopomorpha (Hymenoptera, Mymaridae) in Africa and a key to Alaptus-group genera
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Distribution

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Type material. Holotype female (BMNH) on slide (Fig. 2) labelled: 1. “Nigeria: Oyo, Ibadan, IITA compound, XI.1987, J.S. Noyes, Malaise trap”. 2. “Dicopomorpha zebra Huber ♀ dorsal Holotype”. Paratypes: 11 females, 1 male (BMNH, CNC). GABON: 15–25 km N. Libreville, Forêt de la Mondah, 25 and 26.XI–3.XII.1987, J.S. Noyes (3 females). IVORY COAST: Lamto, ca. 160 km NW Abijan, 5°02’W 6°13’N, XI.1988, J.S. Noyes, XI.1988 (6 females) and 17.VII.1988 (1 female). NIGERIA: Oyo, Ibadan, IITA compound, XI.1987, J.S. Noyes (1 female, 1 male).
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