Landcare Research - Manaaki Whenua

Landcare-Research -Manaaki Whenua

ICHNEUMONIDAE: : Venturia Schrottky 1902


Diagnosis:

Characteristics of Venturia include: 1. Body size <10mm; 2. Position of spiracle on 1 of metasoma is clearly behind the centre; 3. Shape of aerolet in forewing is triangulate; 4. Colour of face is only black; 5. Metasoma compressed laterally; 6. Size of ocelli small; 7. Length of antennae is shorter than body; 8. Length of ovipositor is distinct but not longer than body; 9. Wings present; 10. Colour of wings hyaline (clear); 11. Sternaulus absent; 12. Shape of face in lateral view flat or only weakly bulging; 13. Sternite on T1 (viewed laterally) extending past spiracle sometimes forming a long cylinder with tergite; 14. Shape of T1 (viewed laterally) is evenly curved; 15. Number of teeth in mandibles 2; 16. Patterns on metasoma same colour throughout or bicoloured; 17. Length of T1 vs T2 subequal in length; 18. Sculpture on mesoscutum is finely pitted, many hairs; 19. Width of T1 (viewed dorsally) is anterior part slender often parallel, strongly widening behind spiracle; 20. Glymma on T1 absent; 21. Sculpture on metasoma smooth with a semi-glossy or satin appearance at least on T2; 22. Propodeum long (reaching at least halfway along metacoxae).

Similarity to Other Taxa

Venturia is a mid-sized Ichneumonid in New Zealand. It is similar in size to: Habronyx , Liotryphron , Phytodietus , Dusona and Lissonota . It can be separated from other similar sized taxa by having the spiracle on T1 is well behind the centre of T1, no glymma, face is all black, distinct ovipositor but not longer than body, aerolet in forewing is triangulate. The propodeum is long (reaching at least halfway along metacoxae).

Compare


Distribution in NZ


North Island: AK, WN. South Island: NN, MC.

Species in NZ

Two species: the endemic Venturia intrudens (Smith, 1878), and V. canescens (Gravenhorst, 1829), which is probably an accidental introduction.

Biology & hosts

Venturia is a moderately large genus which mostly occur in the Old World tropics. One species, V. canescens is widely distributed and is common in storage areas associated with grains, where it is a parasitoid of Lepidoptera larvae of many species (Gauld 1984, Yu et al. 2005). The host of Venturia intrudens is not known. They appear to be uncommon.

Sources of information

Gauld ID 1984. An Introduction to the Ichneumonidae of Australia. London, British Museum (Natural History). 413 p.
Valentine EW & Walker AK. 1991. Annotated Catalogue of New Zealand Hymenoptera. DSIR Plant Protection Report 4. General Printing Services, 84 pp.
Yu DS, van Achterburg K, Horstmann K. 2005. World Ichneumonoidea 2004. Taxonomy, Biology, Morphology and Distribution. CD/DVD. Taxapad. Vancouver, Canada.

Citation

Ward DF & Schnitzler FR. 2013. Ichneumonidae of New Zealand. Genus Venturia http://ichneumonidae.landcareresearch.co.nz
Accessed: 22 October 2019

Revised

v1.0. Ward DF & Schnitzler FR. 2013