Posts Tagged 'beetles'

Nicrophorus

NicrophorusA carrion beeetle, also known as a sexton beetle, of the genus Nicrophorus, from the Greek for “carrier of the dead.” Found this on a mammal corpse on a path at Dead Horse Bay. The carcass was in curious state; some exposed bones were already whitened, but the main part of the body still had leathery skin/fur and did not smell pleasant. (Nothing like the Götterdämmerung of rotted chicken used to bait for carrion beetles here, though.) Not sure what the animal was: didn’t look big enough for adult raccoon; perhaps a feral cat, of which there are plenty in the phragmites.

So these Nicrophorus beetles — there are some 15 species in the U.S. — are remarkable for providing not just a nest egg of carrion for their young, but sticking around to help feed the wee larvae when they are just starting out as squirmy little rotten-flesh eaters.

The mites — you can spot two adults and see some young ones clustering on the beetle body as well — are symbionts, not parasites. Sources of carrion are extremely variable and unpredictable: so the beetles range throughout the landscape searching for it, carrying the mites (of at least four families), who eat fly larvae and couldn’t get around so well otherwise; the fly larvae is competition for the beetle larvae.

Nicrophorus marginatus is the most wide-spread of these beetles, but it’s very similar looking to N. obscurus and N. guttula, and they evidently can’t be separated based on overall appearance according to Bugguide.

Still Going Strong, But Hurry Up!

IMG_4439These 2-spotted ladybug larvae were still active on Thursday. Time to pupate, kids!

Now, here’s something I’m not so sure about: Pupation and eggs generally seem to be set on leaves. These leaves will shortly fall to the ground, many to blow away to who knows where (into the harbor in some cases, in this situation). This seems a real chancy way of surviving the winter. Are there special end of season approaches to getting the genes through the cold months?

More Two-Spotted Ladybugs

catalpaThe Catalpa trees grow and the big heart-shaped leaves attract aphids, lots of aphids. The aphids, tiny little white sucking machines, coat the leaves with their “dew” — what goes in must come out in some form — which in turn attracts ants and wasps. The aphids themselves attract ladybugs, hungry little beasts. All the dark things on the leaf above are early-stage instars of lady beetle larvae, which look absolutely nothing like the shiny, round adults. Adalia bipunctataThis photo and the one below are shot with my camera’s macro through a 10x loupe. The ‘gator-like larval stage ladybug — see the two spots on its side, like the adult Two-spotted — is surrounded by aphids; these aphids are so small they can barely be seen with the naked eye. catalpa2I don’t know if these are instals of A. bipunctata, but suspect so. I doubt that’s my hair, since I was wearing a hat. Adalia bipunctataThis one is so plump I suspect it’s close to pupating.

I have read that some localities ban Catalpas because they are messy trees, dropping foot-long, dried bean-pod-like seed pods, dripping with sticky goo, swarming with insects. But let’s hear it for mess! Nature is messy, complicated, interrelated. It is not a lawn or vast monocultural farm field soaked in poisons, which, as we keep learning over and over again, do tend to move from the insects and plants they are aimed against to fish and reptiles and birds and mammals, including the very people who apply the toxins and the rest of us. Quelle surprise! Adalia bipunctataLuckily, Brooklyn Bridge Park has had the vision to plant Catalpas all over the place. And almost every one of these trees has Two-spotted ladybugs in them. Remember, this is a species that isn’t being seen as much as it used to be. Above and below, Two-spotted pairs are engaged in making more of their kind.Adalia bipunctataRemember, too, that while the standard Adalia bipunctata is red-orange with two black spots, there are melanistic variations that are black with four red spots (or squares as in the side markings here), among other patterns.Adalia bipunctataHere’s what the loupe/camera set up view looks like before cropping. Rest of my left-hand fingers are supporting the leaf from underneath. I’m amazed these came out this well. Adalia bipunctataI wrote most of this post some weeks again, but a cursory look yesterday found three adult TSLs underneath some awfully bedraggled looking Catalpa leaves. Three cheers for bedraggled!

For my first discovery of these rare beetles two years ago on these trees, see here.

USDA Prime

Harmonia axyridisNot only does the Multicolored Asian Ladybeetle (Harmonia axyridis) come in multiple colors, they’re also found with a variable number of spots. Or none at all. That’s me in the reflection of those high-gloss elytra.

(Post title refers to the first release of the species in the U.S., which was done by the USDA. Subsequent releases may have been accidental.)

Insects of the Weekend

IMG_6273A mess of these sand wasps (Bembicini) were trying to dig into the little beach along the Hudson by Ossining train station. Sand seemed too loose, though, for their nest chambers.harvestmanMoth Night at the Greenbelt Nature Center with the Staten Island Museum on Saturday meant more than moths. This harvestman (Opiliones) has little red mites attached to its legs. Orthosoma brunneumBrown Prionid beetle (Orthosoma brunneum), I think. About 1.25″ long.IMG_6329A camel cricket, family Rhaphidophoridae. Not one of the noise-makers, this tree cricket is a great jumper; we found several on trunks (I rotated this image; the cricket was facing down initially). Its antenna are nearly three times the body length.Epimecis hortariaIt’s National Moth Week, which may be something of a hard sell. Most moths, after all, are modest studies in gray. The showy ones, like the Luna, are few and far between, especially in the city. A white sheet with black lights was set up, as was a trough of “moth bait,” a gooey sludge of banana, booze, and brown sugar allowed to fester in the sun for a while. Both of these attract different species. The Tulip-tree Beauty (Epimecis hortaria) above didn’t come directly to either, but roosted in the area.Lomographia vestaliataWhite Spring Moth (Lomographia vestaliata).moth1Toothed Brown Carpet (Xanthorhoe lacustrata). There are some 12,000 know species of Lepidoptera in the U.S. & Canada; less than 800 of these are butterflies; the rest moths, and I guess they ran out of common names…

Green June in July

Cotinus nitidaI saw this flying fairly low and slow, and waited a while to see if it would land. Waiting may be the essence of natural history observation. As it flew, my thought process was thus: too small for a cicada, too wide for a wasp. Once it landed, Japanese Beetle came to mind; but although similar, this is larger, and lacks the grooved elytra and the tufty bristles of that pest. This turned out to be the Green June Beetle (Cotinus nitida). Another foot soldier in the empire of beetles, the true earthlings (the rest of us just live here, wantonly slaughtering everything that moves). The Latin nitida means shiny, bright, handsome. Cotinus nitidaSeveral days later, I found another in a different borough.

Brooklyn’s Two-Spotted Continue

Two years ago, I stumbled upon some unfamiliar ladybugs. There were Two-spotted (Adalia bipunctata), which turned out to be rather rare. It was the first Brooklyn report for the species. Last summer, the site was inaccessible to civilians because of construction. This weekend I took a look at the trees, as I usually do. They have been quite active with Multicolored Asian Ladybugs (Harmonia axyridis) for the last couple of weeks. But hello! Something different from the very round, very large (for a ladybug) H. axyridis, a nuisance species, if not worse, spread by gardeners and garden-suppliers. Indeed, many think the spread of these beetles has been the cause, or one of the causes, of the decline of the likes of A. bipunctata and other now rare native species. Adalia bipunctataBut the Two-spotted is still in town. Adalia bipunctataWhile trying to get a live photo, the beetle flew down to my camera lens, so I snapped this pic with my phone.

From the Lost Lady Project, I’ve learned that A. bipunctata has been reported at four New York State sites. Like many native species, it has been declining in numbers for the last twenty years or more. The location here is tiny, just a few trees, and isolated from other bits of green. It shows the importance of having a variety of trees and plants in as many places as possible. But this location is much busier with humans than it used to be…

Only three other places in New York! This isn’t to say there aren’t more places, which haven’t been discovered because there aren’t as many people looking for lady beetles as, say, there are people enabling FIFA’s looting, and/or staring at their toenails, but it does suggest their specialness. Adalia bipunctataSpeaking of nails. The Two-spotted comes in a variety of color forms. This one, found at the same time, is particularly striking.


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