Tetrastichus marcusgrahami, Hansson & Schmidt, 2020

Hansson, Christer & Schmidt, Stefan, 2020, A revision of European species of the genus Tetrastichus Haliday (Hymenoptera: Eulophidae) using integrative taxonomy, Biodiversity Data Journal 8, pp. 59177-59177 : 59177

Tetrastichus marcusgrahami sp. n.

Description

FEMALE holotype (Fig. 34). Body length 2.6 mm. Head. Width/length in dorsal view 2.4, width/length in frontal view 1.3, POL/OOL 1.3, head/mesosoma width 1.1, mouth width/malar space 1.9, malar space/eye height 0.8. Antenna. Scape length/eye height 1.0, pedicel+flagellum length/mesosoma width 1.1, length/width F1, F2, F3 1.8, 1.4, 1.2, clava length/width 2.8, lengths pedicel/F1 0.6, lengths F1/F2 1.2, F1/F3 1.3, lengths F1, F2, F3/clava 0.5, 0.5, 0.4, width F1/pedicel (dorsal view) 1.2, lengths antennal spicule/C3 0.2. Mesosoma. Length/width 1.5, mesoscutal mid-lobe length/width 1.0 (width measured in anterior part), mid-lobe with a weak median groove in median ⅓, with five adnotaular setae on each side, lengths mesoscutum/mesoscutellum (measured medially) 1.2, lengths dorsellum/propodeum 0.5, mesoscutellum length/width 1.1, length/width of enclosed space between submedian grooves 2.8, distance between SMG/distance between SMG and SLG 1.5, propodeum with strong reticulation in anterior ½, smooth in posterior ½, propodeal callus with five setae. Fore wing. Costal cell length/width 9.1, lengths costal cell/marginal vein 1.1, lengths marginal/stigmal veins 3.0. Gaster. Ovate, length/width 1.4, lengths gaster/mesosoma 1.1, Gt7 length/width 0.6, lengths longest cercal seta/next longest seta 1.3, longest cercal seta curved, ovipositor sheaths not reaching apex of Gt7.

Colour. Body golden-green, scape golden-green, pedicel and flagellum dark brown, tegulae black with metallic tinges, wings hyaline, wing venation brown to fuscous, coxae and femora concolorous with body, trochanters blackish, tibiae yellowish-brown, tarsi dark brown.

MALE. Unknown.

Diagnosis

Mandibles as in T. halidayi , i.e. mandibles very large with outer tooth falcate and separated by a wide gap from the two small inner teeth (as in Figs. 2a and 65d); mouth opening large, 1.9 × as wide as malar space. Differs from T. halidayi in having a shorter female gaster with ovipositor retracted and apex not reaching apical margin of gaster. Similar also to T. cyprus , from which it differs in antennal characters as indicated in the key.

Etymology

Named after collector of type specimen, Marcus William Robert de Vere Graham.

Distribution

United Kingdom.

Notes

The head of the holotype is detached and glued separately on a card and the right antennal flagellum is missing (deposited in NHM).

Host

Unknown.

Material examined

Holotype ♀ "ENGLAND: Lancashire, Freshfield (3) (Area I), 3.vi.1959", "M.W.R. de V. Graham coll., BMNH(E) 1995-489" (NHM).