insects
awild | March 2, 2010What was that bizarre balloon-spangled creature?
It's the larva of a Theope butterfly in the family Riodinidae. Here is the full photo, from Panama:
Theope, tended by Azteca velox
An infinite number of highly valuable Myrmecos Points(â¢) go to commentator JasonC, who not only identified the larva but researched the function of the balloons.
awild | March 2, 2010Here's a chart I made this morning. It depicts the number of new photos tagged "insects" or "insect" uploaded over the history of the leading photo-sharing site Flickr. Note that the graph doesn't show the cumulative total of insect photos on the site; rather, it shows the increase from year-to-year. Thus, even though the rate of increase slowed in 2009, the amount of insect content is still accelerating.
Interpretation of the chart is tricky. The increase may reflect several patterns: a growth in Flickr's popularity, the growth of digital photography, and a growth in overall interest in…
awild | February 25, 2010Speaking of bug horror movies:
If you can make it to Champaign-Urbana this weekend, the 2010 Insect Fear Film Festival will feature The Black Scorpion (1957) and Ice Crawlers (2003). The grad students are assembling art displays, face painting, and an impressively large arthropod petting zoo. The've even shipped in live horseshoe crabs, as well as bess beetles, tarantulas, ginormous grasshoppers & cockroaches, and others. It's tremendous fun.
edyong | February 19, 2010It's not every day that you hear about spy missions that involve a lack of sex, but clearly parasitic wasps don't pay much attention to Hollywood clichés.
These insects merge the thriller, science-fiction and horror genres, They lay their eggs inside other animals, turning them into slaves and living larders that are destined to be eaten inside-out by the developing grubs. To find their victims, they perform feats of espionage worthy of any secret agent, tapping into their mark's communication lines, tailing them back to their homes and infiltrating their families.
Two species of…
awild | February 16, 2010The online early section of Molecular Phylogenetics and Evolution this week has the first comprehensive phylogeny of a rather important genus of ants: Myrmica.
Myrmica is ubiquitous in the colder climates of North America and Eurasia, with a few seemingly incongruous species inhabiting the mountains of tropical southeast Asia. The genus contains about 200 species, many that are common soil-nesting ants in lawns and gardens, and at least one damaging invasive species, M. rubra. The taxonomy ranks among the most difficult of any ant genus, as workers of different species tend to be numbingly…
awild | February 15, 2010
We here at Myrmecos Blog don't care to voice our opinion of talk show host Glenn Beck. But we are rather enamored of dung beetles, those gorgeously ornamented insects who prevent the world from being buried in feces.
Thus, we were pleased to find the following Facebook project in our inbox this weekend:
Can This Dung Beetle Get More Fans Than Glenn Beck?
If you're on facebook, and you like dung beetles, now's your chance to become a fan.
h/t Jesse.
edyong | February 11, 2010Bees can communicate with each other using the famous "waggle dance". With special figure-of-eight gyrations, they can accurately tell other hive-mates about the location of nectar sources. Karl von Frisch translated the waggle dance decades ago but it's just a small part of bee communication. As well as signals that tell their sisters where to find food, bees have a stop signal that silences dancers who are advertising dangerous locations.
The signal is a brief vibration at a frequency of 380 Hz (roughly middle G), that lasts just 150 milliseconds. It's not delivered very gracefully.…
awild | February 11, 2010
click to enlarge
The top-tier journal Nature doesn't often deal in purely phylogenetic research. So when such a study graces their pages we know it's big stuff.
Yesterday, Nature published a 62 gene, 75 species analysis of the evolutionary history of the arthropods. Arthropods, as readers of this blog likely know, are animals with a chitinous exoskeleton and jointed legs. They include the insects, arachnids, crustaceans, centipedes, and others. This is a staggeringly diverse group, and one found just about everywhere on the planet. Most animals are arthropods.
This study has been in the…
awild | February 10, 2010
Plectroctena mandibularis, South Africa
Every now and again someone asks how I get the white background on these sorts of stylized ant shots. Pretty simple: it's a sheet of cheap white printer paper. Overexposing the shot slightly by boosting the flash evens out the white.
I set the ant down on the paper under a petri dish or a lens cap, let her settle in, and remove the cover to get a few seconds of a relaxed ant before she's off to the races.
Photo details: Canon mp-e 65mm 1-5x macro lens on a Canon EOS 20D.
ISO 100, f13, 1/250th sec, diffuse twin flash
awild | February 9, 2010Meinertellidae! It's a jumping bristletail. In California these flightless insects are common around harvester ant nests. I don't think they have any sort of specialized relationship with ants, except perhaps finding the warm microclimate of the mound surface agreeable.
Wings are an ancient adaptation, and most of our modern flightless insects represent an evolutionary loss of function from their flighted forebears. Not so with jumping bristletails. This group diverged from the remaining insects prior to the advent of wings- their line of ancestry has been earthbound since the beginning.…
awild | February 9, 2010
Figure 1. Relationship between normalized metabolic rate and body mass for unitary organisms and whole colonies (from Hou et al 2010)
The notion that insect colonies and their constituent individuals are analogous to multicellular organisms and their constituent cells has been a controversial idea for decades. Is it useful, for example, to think of an ant colony as a single individual? Do superorganisms really exist as coherent entities? Or do insect colonies function more as aggregations of individuals?
Last week, PNAS published the first application of empirical methods to test the…
edyong | February 9, 2010Mothers can teach their children much about the world, but some mothers can do it without ever meeting their young. Take the field cricket Gryllus pennsylvanicus. A female cricket isn't exactly a caring mother. Once she lays her eggs, she abandons them to their fate. But amazingly, she can also forewarn her young of the dangers they might face. If a pregnant female is exposed to a wolf spider, her experiences affect her unborn young. When they hatch, the baby crickets are more likely to freeze when they smell wolf spiders nearby.
If mothers sense a threat in their environment, there are…
awild | February 8, 2010What's this charming creature?
Ten points for the first person to get the family name right, too.
awild | February 5, 2010
A male western hercules beetle, Arizona.
Meet Dynastes granti. This behemouth of an insect is North America's heaviest scarab beetle, found in the mountains of the American southwest where adults feed on the sap of ash trees. I photographed these spectacular insects a few years ago while living in Tucson.
The impressive pronotal horn on the beetle pictured above indicates a male; females are considerably more modest in their armaments:
Male and female hercules beetles
As is so often the case in animals, males use their horns to fight each other for access to females, attempting to pry…
awild | February 2, 2010A reader asks:
I also have a MP-E lens with the MT-24EX flash unit. I was curious to know something I didnât see you mention in your recent blog post about this setup.
Could you share any technical points regarding how you achieve the visible backgrounds with that lens? In general, I get very nice shots with everything beyond the focused subject completely blacked out.
Since dark areas in photographs are the bits that aren't sending light to the camera, it follows that getting a visible backdrop means applying light behind the subject.
Earlier, I wrote that the black backdrop in insect…
edyong | January 28, 2010In 1912, Antarctic explorer Captain Lawrence Oates willingly walked to his death so that his failing health would not jeopardise his friends' odds of survival. Stepping from his tent into a raging blizzard, he left his men with the immortal words, "I am just going outside and may be some time." It was a legendary act of heroism but one that is mirrored by far tinier altruists on a regular basis - ants.
Like Captain Oates, workers of the ant species Temnothorax unifasciatus will also walk off to die in solitude, if they're carrying a fungal infection. In fact, Jurgen Heinze and Bartosz…
awild | January 27, 2010Mark this on your calendar: February 27 is the 27th annual Insect Fear Film Festival. Hosted by the entomology graduate students at the University of Illinois at Urbana-Champaign, the festival showcases two (usually terrible) arthropod movies. This year's delectable offerings are The Black Scorpion (1957) and Ice Crawlers (2003).
If bad movies aren't your thing, the festival also has an insect art competition, live insect displays, face painting, and other buggy entertainment. As way of a preview, Jo-anne posted her pics of last years event here. I've put the full announcement below:…