"...mysterious and little known organisms live within walking distance of where you sit. Splendor awaits in minute proportions.”
E.O. Wilson (Biophilia)
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DISCLAIMERI am a photographer, not an entomologist. I do my best to have professionals assist in identifying the subjects of my photographs. However, positive identifications can not always be done unless the specimen is dead and viewed under a microscope. If you do find an error, or have doubts about the identification provided, please let me know in the comments or by email.
Tag Archives: Coleoptera
With their slow movements, distended abdomens and their propensity for grass, oil beetles will forgive me for thinking that they are the insect equivalent of cows. Indeed for the short period that this specimen was kept in a pill bottle, it managed to eject a green liquid mass of partially digested plant bits (out of which end I did not observe) that would best be described as cud. But there is a more fascinating side to these grass-grazing beetles that belies their placid and lumbering bovinity — they secrete poison from the leg joints, the males have grappling hooks on the antennae, and the children are ruthless killers.
Oil beetles are so named because, when physically disturbed, they exude oily droplets of hemolymph from their joints. This secretion contains cantharidin, a poisonous chemical that can cause a painful blistering (hence sometimes called ‘blister beetles’) on the skin. Certainly a handy defence when you are a fat, flightless beetle.
The lifecycle is an example of hypermetamorphosis, a variety of complete metamorphosis (holometabolism) with several distinct larval stages. After hatching, the larvae, called triungulins, actively climb plants to seek out a flower, where they will transfer to visiting bees. In Meloe franciscanus, the bees will cluster on a stem and secrete pheromones that attract male ground bees. When the male tries to mate with the cluster, the triungulins scramble aboard. The male then moves on to mate with other real female bees, and the triungulins can then transfer to those females. Now fertilized and loaded with larvae, she will carry the triungulins back to the nest, where the little blighters†, going through four instars, will proceed to consume the complete contents of the cell that she constructs and provisions, including the larvae. See the segment from Life in the Undergrowth below for the details of how some blister beetle triungulins do their work. (This is probably Meloe franciscanus: see http://www.pnas.org/content/103/38/14039.full)
And the grappling-hook antennae? Male oil beetles use the hooks on the antennae to latch onto the females antennae during courtship. See an image of the antennae in use at BugGuide.
And don’t you think this would be a good choice for Alberta’s Provincial Beetle?
For more on oil beetles see page 19 of: http://www.tvalfalfaseed.org/resource/files/Alkali%20Bees%20Their%20Biology%20and%20Management%20for%20Alfalfa%20Seed%20Production%20in%20the%20Pacific%20Northwest.pdf
Thanks to BugGuide for the ID
(Photographed 25 May, 2012. Grasslands National Park, Saskatchewan)
†Not an entomological term, although it should be…
This is a showreel produced for Sarah Beynon, an Oxford entomologist. She’s into dung beetles, but there is also some interesting footage of the Sexton Beetle (see my photograph) and its breeding habits.
My first outdoor bug shot (in the white box) for 2012! This purple-rimmed Carabus (Carabus nemoralis Muller, 1764) is also known as the European Ground Beetle.
The elytrawing covers on this one was a dull bronze, an unusual sight for me, because I have only seen black specimens before. I noticed it was different immediately as it scurried out of the leaves I was raking in the front garden. The purple-rimmed carabus is a European import that is synanthropicFrom the Greek syn-, "together with" + anthro, "man". Animals that are ecologically associated with humans, and not found in the wild.The Edmonton area seems to be an island in Alberta for this species, with only a few having been found outside of the city environs. They are a generalist feeder, taking slugs, snails, earthworms, as well as centipedes and millipedes. Reaching a size between 22 – 26mm, this is a good-sized ground beetle, capable of giving you a nip if handled incorrectly!
- Bugs of Alberta by John Acorn
- Carabus nemoralis :: Ground Beetles of Ireland
- Entomology Collection > Carabus nemoralis
- Carabus nemoralis
This is the subject that epitomized my frustrations with my 180mm macro lens! The stag-jawed carabid is a fairly large beetle (25mm/1″) and trying to photograph it with the white-bowl technique with a long-focus macro lens and a single diffused flash was the height of frustration. This is the best front view to come out of the series, but the glare is terrible. This would have been a better candidate for the white-box treatment and a shorter macro lens, but I was in the field and had no other options at the time.
Pasimachus elongatus LeConte 1846 is a predatory ground beetle that is sometimes mistaken for a stag beetle, which are not found in Alberta at all. They can be distinguished from stag beetles in that the antenna have no elbow and there is no comb-like club at the end. They have a two-year life cycle, overwintering as adults or larvae. They are found…well, let John Acorn take over at this point: “To find this mean-looking, purple-trimmed marvel, go to a patch of bald-butt prairie where the soil is sandy. Then start looking under old fence posts or dried cow pies“¹. I found this one last September in Writing-on-Stone Provincial Park, scampering through the butt-bald badlands.
(Image re-edited 2 April, 2012)
- The World’s Largest Tiger Beetle (beetlesinthebush.wordpress.com)
- Friday Beetle Blogging: the Fiery Searcher (myrmecos.wordpress.com)