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Polybia species? |
Now that I have a working lab protocol to measure cyanide, and have at least a rough idea of which species produce cyanide and which don't, I want to turn more attention to observing the flea beetles. To accomplish this I have been hiking over to the successional plots, five experimental areas that are deliberately chopped to the ground on a five-year rotation, and allowed to recover naturally. This repeated treatment provides good habitat for passionflower vines near ground level, and is one area where I can usually find flea beetles. But, it can take a while to get there.
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Lirometopum coronatum katydid on Passiflora auriculata |
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Ptocadica bifasciata on Passiflora auriculata |
The first photo shows the kind of distractions that happen every time I step out the door. It shows a wasp colony (genus
Polybia?) with 1-200 members, I expect with the queen (queens?) in the huddles. A few workers seem busy building new nest carton. When I checked back a couple of hours later the carton was much more enclosed. You can click on the photo to enlarge and see the wasps in detail.
The second photo shows a very bizarre katydid-like insect (Orthoptera: Tettigoniidae), with a rounded green cricket-like body, long antennae, and a strangely flattened head. It took me a while to figure out what I was looking at. The flat face is covered with light colored nodules and the jaws are black, giving the appearance of a crinkled, folded leaf with holes in it! Only when it moved did I see what it was. Apparently this species is carnivorous.
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Monomacra violacea on Passiflora auriculata |
When I finally arrived at the successional plots I did find some flea beetles to observe. In fact I found one leaf of
P. auriculata with three genera on it! To the right is
Ptocadica bifasciata, one of the larger species about 3 mm long. I also saw
Monomacra violacea, the shiny blue flea beetle, and
Parchicola d.f. 2, the yellow-legged yellow flea beetle (not shown here).
I also saw 2 tiny orange flea beetles with black legs sitting on
Passiflora vitifolia. At first I thought it might be another species to add to my study, but after looking I couldn't find any sign that the beetles were feeding. I suspect they were just sitting on the plant. Later another large flea beetle landed near a
P. auriculata, but it too showed no signs of feeding on
Passiflora. So far, in all my work here at La Selva, I have consistently found the same set of flea beetles. The only exception is I haven't recently seen the "fat yellow"
Ptocadica species nor the
Dysonycha decemlineata species. But no new species have cropped up.
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unknown flea beetle (Coleoptera: Chrysomelidae: Alticini) |
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