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Photo#393812
Egg layer - Onycholyda sitkensis - female

Egg layer - Onycholyda sitkensis - Female
Alameda County, California, USA
May 8, 2010
Size: 11.8 mm bl
This insect walked rapidly all over the upper surface of a blackberry leaf, antennae vibrating. After several circuits, it went to the under surface, soon settled in one spot, and swept the tip of its abdomen back and forth laterally a few times, across a rib of the leaf. I believe it was a female depositing the egg seen behind it here (photo taken after the insect had come to a stop and moved forward a bit), although I can't be sure the egg wasn't there first.

Images of this individual: tag all
Egg layer - Onycholyda sitkensis - female Egg layer - Onycholyda sitkensis - female Egg layer: face - Onycholyda sitkensis - female Egg - Onycholyda sitkensis

Comments

Hi, I am a professor in the
Hi,
I am a professor in the Biology Dept. at Western Washington University, in Bellingham, WA. For the last decade or so, I've been working on a field guide to Pacific Northwest insects (southern BC, WA, OR, ID, northern CA, western MT), to be published by Seattle Audubon Society. The guide will feature species accounts of nearly 1,200 species, each with a description of its natural history, how to distinguish it from similar species, and a photograph of a live adult. The featured species represent the great majority of insects that people in the region are likely to notice, along with a broad sampling of general insect diversity, including species of conservation need, pest species, and species that are good examples of the variety of insect form and function that can be found in the region. I'm writing the field guide in a style that will make it useful to a wide range of people: teachers and their students, field biologists, gardeners, foresters, farmers, homeowners, conservation managers, and curious naturalists in general. One of the things that makes this guide unique is that the species accounts are sufficiently detailed in the great majority of cases to allow accurate species-level identification. Gathering all of this information is the main reason why this project has taken so long! I'm finally seeing the light at the end of the tunnel, in that I now have drafts of the species accounts, as well as the family and order introductions. I still have a number of loose ends to tend to, but am planning on having it sent off to the printers in time for a spring 2015 release.

One of the loose ends in the project is finishing up with obtaining the necessary photographs. I've spent considerable time in the field taking photographs of insects, and about half of the images in this field guide will be my own. The remainder of the photographs are being donated by a large number of insect photographers, most of whom I've contacted after seeing their images on BugGuide, as well as others with photostreams on sites such as Flickr. However, I still have a few holes to fill in the photos I would like to include in the guide. I'm hoping you'd be willing to donate this image and a few others for use in the field guide. You would be acknowledged in the field guide for the donated photographs (your name would appear next to the photo), and you would retain the copyrights to the photograph. Unfortunately, because Seattle Audubon Society is a non-profit organization, they're producing the guide on a shoestring budget, and cannot pay photographers for images. Proceeds from the field guide will be used for Seattle Audubon conservation and environmental education efforts. If you'd be willing to donate this and a few other images to the cause, please contact me at peterson@biol.wwu.edu, and I can provide a full list of the images I'd like to use.

Thanks!
-Merrill Peterson

thanks, G & Dave -- nice one
name spelling in the Guide matches ECatSym's(1)

Moved from Webspinning and Leafrolling Sawflies.

Pamphiliidae
Onycholyda sitchensis. A western species that feeds on Rubus spp. Great pictures. This appears to be egg laying. Pamphiliid eggs are mostly exposed on the plant surface with only a small part pinched into the plant tissue. Most sawflies insert the entire egg into plant tissue. I'm not sure if egg laying of this species has been described; I would need to check the literature.

 
One other possibility
Thanks for the ID! Not having checked the leaf until the insect was on it, I wasn't sure whether she was laying an egg or parasitizing a pre-existing egg.

This may or may not signify anything: the egg has a dark spot, and it was photographed when fresh, less than two minutes after the insect flew off.

 
checked reference
I looked up a paper on the life history. It describes the egg as white and oval and a picture is exactly like yours. There are usually one or two eggs per leaflet, and they are deposited on a leaf vein (it looks like it is on a leaf vein in your picture). The female cuts a small slit and pinches a small fold of the egg into this slit. The egg derives moisture from the vein through this fold - otherwise the egg would soon dry up.

 
The egg is hers, then
Yes, it's on a vein, what I was calling a rib. The sideways sweeps of the sawfly's abdomen must have been the cutting of a slit.

Moved
Moved from ID Request.

Wow!
Pretty certain this is a web-spinning sawfly, family Pamphiliidae. Great images!

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