Eurytoma robusta Mayr, 1878

Gómez, José Francisco, Nieves-Aldrey, José Luis, Nieves, María Hernández & Stone, Graham Nicholas, 2011, Comparative morphology and biology of terminalinstar larvae of some Eurytoma (Hymenoptera, Eurytomidae) species parasitoids of gall wasps (Hymenoptera, Cynipidae) in western Europe, Zoosystema 33 (3), pp. 287-323 : 312

publication ID

https://doi.org/ 10.5252/z2011n3a3

persistent identifier

https://treatment.plazi.org/id/03E487A7-AF52-2765-05FB-FF136BC1FDC8

treatment provided by

Felipe

scientific name

Eurytoma robusta Mayr, 1878
status

 

Eurytoma robusta Mayr, 1878 View in CoL

MATERIAL EXAMINED. — Ex Isocolus scabiosae form rogenhoferi : Spain. Guadalajara, Pozo de Guadalajara, 3.X.2004, J. L. Nieves leg (n = 1).

DESCRIPTION

n = 1; body length 2 mm; body width 1.2 mm ( Figs 5G View FIG ; 7G View FIG ); body short and wide; ratio L/W = 1.38; ventral margin of body segments convex; anterodorsal protuberances present from second thoracic segment to the seventh abdominal and not protruding beyond the dorsal margin of body segments ( Fig. 7G View FIG ).

Antero-medial setae of the antennal area situated slightly below the antennae; antero-medial setae of vertex relatively high on the upper face, closer to the anterior margin of vertex than to the antennae ( Fig. 9F View FIG ); ratios SA/LAA = 0.29 and SA/DAV = 1.18; dorsal-labral setae as long as clypeal setae; ventral margin of clypeus indistinct; labrum with slight divisions limited to apical part of labrum; the five medial lobes are not well differentiated; maxillary palps conspicuous ( Fig. 12A View FIG ).

Mandibles with two teeth, exposed in part, with the tip of the first tooth visible ( Fig. 12A View FIG ); ratio L/W 1T = 2.08; outer margin of first tooth strongly convex; its tip moderately recurved; apex of the second tooth straight, directed upwards in the same direction as the first tooth, and more or less acute; inner margin of mandible, from the base of second tooth, more or less straight and not interrupted ( Fig. 13G View FIG ).

BIOLOGY

This species has been recorded as a common ectoparasitoid of some galling tephritid fly species in heads of Centaurea and stems of Cirsium (Asteraceae) . It is not clear whether it is a parasitoid of the cynipid gall species Isocolus scabiosae (Giraud, 1859) form rogenhoferi Wachtl, 1880 as well, which occupies similar habitats. We have reared this species from heads of Centaurea scabiosa L. ( Fig. 14J View FIG ) containing both cynipid and tephritid galls. Varley (1937) describes E. robusta as being partially phytophagous after consuming the host larva. Johannesen & Seitz (2003) also studied larval distributions of Eurytoma robusta in galls of the tephritid gall fly Urophora cardui Linnaeus, 1758 .

REMARKS

Eurytoma robusta is one of the few eurytomid species associated with cynipid communities whose larva has already been thoroughly described, by Varley (1937). Our diagnosis provides additional data.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Eurytomidae

Genus

Eurytoma

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