Tag Archives: crum woods

Pyractomena borealis

Pyractomena borealis (Lampyridae) exploring the surface of trees on a warm winter day in February. The third photograph shows how they can retract their head under the carapace like a turtle. At first I thought they might be foraging — they are highly predaceous, and hunt slugs and earthworms (in packs!) by first injecting them with paralytics. But they might have just been looking for a place to pupate, because it’s time for that. Adults will emerge sometime in early Spring to be the first fireflies in the area. The larvae are bioluminescent, too. The hypothesis about why the larvae glow is that it evolved first as an aposematic trait in larvae, warning mice and toads of the presence of lucibufagins, steroidal toxins in the hemolymph. It’s thought that the adult habit of using flashes is secondarily evolved, millions of years after the larvae evolved the ability to glow. The ability of larvae to glow even predates the origin of the Lampyridae, I gather. For more enlightening details, see Branham and Wezel (2003)Stanger-Hall et al. (2007), and Martin et al. 2017.

Colin Purrington Photography: Insects &emdash; Pyractomena larva

Colin Purrington Photography: Insects &emdash; Pyractomena larva

Colin Purrington Photography: Insects &emdash; Pyractomena larva

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Spring in the dead of Winter

I took this photograph on January 31st while wearing a t-shirt. I like flowers and insects and warm weather, but I sure miss the discrete seasonality of my youth. Winter aconite (Eranthis hyemalis), growing in the Crum Woods, Swarthmore College, Pennsylvania.

Fly foraging for nectar on Eranthus hyemalis (Eranthis hyemalis; Ranunculaceae). Crum Woods, Swarthmore College, Pennsylvania.

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