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#ichneumonidae

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Albert Cardona

The #iNaturalist fairy—by the hand of user ‘fonsv’–just delivered a precise species ID to an observation of mine of an #Ichneumonidae parasitoid wasp. A great match; mind these are hard to identify, primarily from the lack of available guides and accessible reference material. Mine is merely the 5th observation worldwide of this species.

Rhembobius perscrutator inaturalist.org/observations/1

Almost entirely black parasitoid wasp with 4 consecutive white segments in its anteanne, a white telson, and black marks on the lateral side of its wings—the latter a typical trait of Ichneumonidae wasps.
#Hymenoptera#entomology#insects
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The Gardener

If you were an ant-parasitizing wasp, what would be your preferred method of hunting ants? Your options include hovering over ants or hang on grass, each comes with pros and cons. This article comes with action photos!!

#ants #wasp #parasitoid #insect #ecology #Hymenoptera #DarwinWasp #ichneumonidae

jhr.pensoft.net/article/106836

Journal of Hymenoptera ResearchAn alternative host searching strategy found in the subfamily Hybrizontinae (Hymenoptera, Ichneumonidae)The present study reports the oviposition behavior of the ant parasitoid wasp, Ghilaromma orientalis, on an undescribed ant species from Lasius fuliginosus species group in Japan, illustrated by clear photographs. Previously, the oviposition behavior in the subfamily Hybrizontinae had been limited to species hovering on an ant trail and attacking larvae carried by worker ants. In contrast, in G. orientalis, whose oviposition behavior had not been reported to date, the wasp hung on the grass growing along the ants’ trail by its hind legs with its head down, and when workers with larvae pass by, directed its abdomen toward the larvae with its hind legs remaining on the grass. Our findings suggest that the subfamily Hybrizontinae employs two host-searching strategies—an active strategy previously known and the ambush-type host-searching strategy employed by G. orientalis. The ambush-type strategy affords G. orientalis the advantage of laying eggs in a narrow environment where wasps cannot fly without being noticed by ants. Moreover, by avoiding detection through ambush tactics, wasps are increasing their chance for attack, as ants continue to transport their larvae. However, the search range of wasps is reduced, which may limit the opportunities for parasitization. Additionally, while Lasius nipponensis has been observed as the sole known host of G. orientalis, the oviposition behavior has now been observed in an undescribed species of L. fuliginosus group, suggesting that G. orientalis may have a subgenus-specific host range.
Public
Donald Hobern

#SLAM #Malaise trap contents from last week in #Canberra. Full-size photo is 8688x5792 - second image is full-size crop to indicate detail. View original on Flickr:

flickr.com/photos/dhobern/5266

Some interesting flying ants, various attractive hoppers and two female #Leptobatopsis mesominiata (#Ichneumonidae) in the mix. I'll image many of these and set the sample aside for DNA.

If you work on any group and would like me to image specific individuals, let me know.

Week's sample of arthropods in alcohol from SLAM trap operated in Aranda, ACT, 27 January to 3 February 2023
Crop of image for week's sample of arthropods in alcohol from SLAM trap operated in Aranda, ACT, 27 January to 3 February 2023 Includes many small insects, springtails, etc. the underside of a cockroach and an orange and black ichneumon wasp (female Leptobatopsis mesominiata).
#entomology
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chris@strafpla.net

@chrisU just vanishing seems to be their thing - I found a few dead ones but the rest seems to either have left or is hiding again (or died in a secret place I may find one day).
I have no idea what made them wake up all at the same time, I guess it must have been related to the weather or maybe some change of the temperature indoor caused by it.

I didn’t use #ladybugs yet but #Ichneumonidae for pest control - they are so tiny / invisible that I didn’t feel attached to them.

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Donald Hobern

Keyed out another #DarwinWasp (#Ichneumonidae, first image) as the fourth obvious species from the genus #Anacis so far found in my garden in #Canberra, #Australia. None of these species is named. Images here of all four females (males are different and will need DNA to match up).

Gauld 1984, The Ichneumonidae of Australia (the last major work on the fauna here) lists the one named species of Anacis and adds "I have seen 55 undescribed species."

Undescribed female orange and black parasitic wasp in the genus Anacis, from Malaise trap, Aranda ACT, 26 August to 2 September 2022
Undescribed female orange parasitic wasp in the genus Anacis, from Malaise trap, Aranda ACT, 24-31 December 2022
Undescribed female red and black parasitic wasp in the genus Anacis, from Malaise trap, Aranda ACT, 20-27 August 2021 - a common species at that time
Undescribed female red and black parasitic wasp in the genus Anacis, from Malaise trap, Aranda ACT, 11-18 March 2021 - a common species at that time
#entomology#biodiversity#Hymenoptera
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