Tag Archives: snow

Snow midge with yellow halteres

Here’s a snow midge I found a few days ago at Hildacy Farm Preserve. I’m not positive about the species, but perhaps Diamesa nivoriunda. I only saw one, but related members of the genus are reported to swarm during the winter. 

What I’d love to know is why the halteres are yellow. They seem to be yellow on majority of diptera I’ve seen, and I’ve never stumbled onto a paper discussing why that is. All I could find was the sentence “Haltere color is often used to distinguish between species” in a Drosophila book .” If you know of a paper, please send link ASAP. Am dying of curiosity.

 Colin Purrington Photography: Insects &emdash; Snow midge (Diamesa nivoriunda)

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Small winter stonefly

I was out looking for the elusive snow fly yesterday but found this, instead: an eastern stonefly (Allocapnia recta), a member of the Capniidae (small winter stoneflies). At least that’s what I think it is. Larvae are active during the winter, and adults can fly and mate even when temperature is in the teens. Pretty incredible to see them flitting around on a cold day when other insects cannot even move. At Hildacy Farm in Media, PA. Probably emerged from the nearby Crum Creek. 

Colin Purrington Photography: Insects &emdash; Eastern stonefly (Allocapnia recta) Colin Purrington Photography: Insects &emdash; Eastern stonefly (Allocapnia recta)

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Skunk cabbages blooming in the snow

For fans of skunk cabbage (Symplocarpus foetidus), here are a several photographs of from Swarthmore, Pennsylvania. You can see the spadix (an inflorescence) peeking out from inside the warm cavity formed by the spathe (a modified leaf). The spathes are a bit frost damaged because they emerged in early December this year, and their thermogenic capabilities weren’t sufficient to fully weather the cold.

Colin Purrington Photography: Plants &emdash; Eastern skunk cabbages (Symplocarpus foetidus) flowering in snow

Colin Purrington Photography: Plants &emdash; Eastern skunk cabbages (Symplocarpus foetidus) flowering in snow

Here are some that emerged too soon and were damaged by freezing temperatures. There might be fully viable flowers within but I didn’t want to disturb them.

Colin Purrington Photography: Plants &emdash; Eastern skunk cabbages (Symplocarpus foetidus) with frost damage

Finally, here is a photograph from a prior year to show what they look like when they are not damaged by frost. They look like porcelain replicas of rotting beef tongues.

Colin Purrington Photography: Plants &emdash; Eastern skunk cabbages (Symplocarpus foetidus) spathes

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Snow fly

If you’re out on a nature walk today, keep your eyes peeled for snow flies. These are essentially wingless crane flies loaded with antifreeze. This one is a male Chionea scita, I believe. Not much is known about these insects, although there is speculation that at least some members of the genus hang out in rodent burrows eating feces. (Don’t judge.) Please see “The crane fly genus Chionea in North America” (Byers 1983) for more details.

You might note that it has halteres, which is interesting because these are organs used in flight (they are modified wings … which is why flies only have one pair of wings). Would be fun to figure out whether snow fly halteres still work, though that would have to be inferred by anatomy and maybe some electrophysiological tricks. Or perhaps they serve a new function. To see photographs of some flies that have lost their halteres, check out the Braulidae (bee parasites) or Hippoboscidae ovinus (sheep ked). I love wingless flies. Did a presentation on them when I took entomology during high school … and have been creeped out and impressed by them ever since.

Colin Purrington Photography: Insects &emdash; snow-fly

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