Showing posts with label Potter Wasp. Show all posts
Showing posts with label Potter Wasp. Show all posts

Tuesday, July 30, 2013

Always Look Twice ...

... look a little closer at that dead (or alive!) "leaf" or "twig", look under leaves and flowers, and take the time to turn rocks and logs over. Hold these thoughts on a nature hike, otherwise it's easy to miss out on the really interesting, captivating and ofttimes amusing things going on in the wonderful world of nature.

Sometimes you just have to be lucky enough to be in the right place at the right time. I would have overlooked this tiny green spheroid on a grape leaf had I not caught a female Hummingbird Clearwing in the act of ovipositing.


This closeup of the egg really pushes the limits of the camera's macro.



The stabilimentum of a Lined orbweaver (Mangora gibberosa) – and its handicrafter hiding in the background – easily passed by had the light not caught the silk set against a shaded background. A small spider, the adult female is only about 6 mm in length.




At 3 mm the fancifully named Bowl and Doily Weaver (Frontinella communis) is only half as long. Again, it was the web which gave away the spider's location, otherwise it would have been virtually impossible to spot the tiny arachnid despite its bold, contrasting markings.




What appears at first glance to be a blob of mud stuck to the seed pods of a mustard plant is the handiwork of one of nature's own potters, Eumenes fraternus, more commonly known as – what else? – a Potter Wasp.



A photo taken two days later ... this time the picture includes a complimentary Toadflax Brocade Moth (Calophasia lunula).


Like much out there in the living world the tiny urn (I would guesstimate it's diameter to be about 10 mm) is appealing esthetically, but it's purpose is of course functional, not decorative. The female builds, provisions and seals the nest for its larva; I believe the caterpillar within is a Cankerworm. (By the way, this is a different nest that in the photo above and I found it already broken, I didn't crack it open just to examine the contents.)



No worries about overlooking these boldly colored "bees". The black-and-white wasp on top is Philanthus politus – a Beewolf – and aptly named, as the females sting and paralyze various host bee species in order to provision their larvae. The victim on the bottom with the red abdomen is Sphecodes spp., a member of the Halictid Bee (Sweat Bee) family. Generally Halictid bees collect pollen in the manner of many other bees to feed their young, but Sphecodes is a kleptoparasite, laying its eggs in the nests of other Halictic and Plasterer Bees.




Prickly Ash is so-called for good reason, but these "thorns" are the wrong shape and color. And sometimes one chances across the same thorns on a tree such as Boxelder, where they are definitely out of character. A closer look reveals that these are cleverly disguised Flatid Planthoppers, probably Metcalfa pruinosa. It's fascinating that in order for the deception to succeed the insects must instinctively act as a group and stagger themselves along the twig. A lone planthopper on a twig would hardly look like a thorn, would it?



The long, lacy, almost ethereal fronds of this fern growing in the moist woodland soil at the Vanderwater Conservation Area caught my eye. An expert would no doubt have known what these were, but as a novice to the world of non-flowering plants, one fern looks much like another to me. To facilitate identification I make a practice of studying and photographing the overall aspect of the plants as a group, the fronds, the pinnae, the stipe ...


... and the spore-producing sori on the undersides of the fertile fronds – which also bore small green growths that proved to be pivotal in establishing the identity of the plant. In point of fact, this is a Bulblet Fern (Cystopteris bulbifera) and the little bulblets will eventually drop off and grow into new ferns.




Always look twice indeed – an ant with a ginormous blue-green head scuttling among the debris on the forest floor certainly called for a double take.



Attributing human qualities to an insect may not be good science, but it does seem as if this Katydid nymph is staring back at the camera in a bellicose manner. An insect with attitude – "What're ya'll lookin' at?"

Thursday, June 17, 2010

A Wolf in Sheep's Clothing

What looks like an innocuous bumblebee ...

... isn't a bee at all. This "bumblebee" has only one pair of wings, and upon closer inspection the head and legs also look wrong for a bee. This insect is actually a predacious bee-like robber fly belonging to the genus Laphria. In fact this species is Laphria thoracica; the field marks are the yellow hair around the wings and the orange on the legs.

One wonders which pressures of natural selection produced such a faithful reproduction of a bee. Is this the Batesian mimicry also employed by many defenceless nectar sippers, intended to dissuade hungry birds looking for lunch? Or the stealth camouflage of a lurk and pounce hunter, evolved to allow the fly to get close to its prey?

Sure enough, it wasn't long until the fly got its dinner. Robber flies will eat whatever insects they can capture and overpower, including one another, but this is the first time I have seen one actually capture and consume a bee.

Male robber flies are shorter and less robust than the females. This one got trapped in a friend's window ... and of course fooled her into thinking he was a bee. After being photographed he was shown the door and sent on his way.

Another male observed at the same locale as the female.


These are not wasps in the next three pictures, they are flies, Thick-headed Flies or Conopid Flies of the genus Physocephala, probably Physocephala tibialis. Despite its fearsome needle-like proboscis the adult is actually a defenceless nectar drinker. The larvae, on the other hand, are internal parasites of bees and wasps. Should a bee pass by the female fly will alight on it, lay its eggs, and the fly larve will hatch and ... you know the rest of the story.


Again, is the purpose of this near perfect mimicry to avoid predation? Or to lower the suspicion of a potential host? Both? Here's a photo of the real thing, a Potter Wasp.

Monday, August 11, 2008

A walk among the gardens of the Tweed Heritage Center and along "the Trail" ...

Most molluscs are found in the water but some species, such as this colorful land snail (Cepaea sp.) and the common garden slug, are terrestrial.


This Pennsylvania Leatherwing (Chauliognathus pensylvanicus) has a hitchhiker, a parasitic mite.


Potter Wasp (Eumenes fraternus)


Sand Wasp (genus Bicyrtes, or Bembix ???) ... awesome translucent green eyes on these insects


Honeybee (Apis mellifera)


The insect above is NOT a bee ... many species of of flies, such as this Drone Fly (Eristalis sp.), mimic bees as a defense against predation. Compare the hoverfly's physical attributes to the bees and wasps above, and the common Greenbottle Fly (Lucilia sericata) below. Flies (order Diptera) only have two wings, members of the order Hymenoptera such as ants, bees, wasps have four.


Death lurks among the flowers; Ambush Bugs (Phymata pennsylvanica) await the unwary. These bugs (order Hemiptera ... true bugs) blend in with a wide variety of blossoms.


Flower Spiders (a.k.a. Crab Spider ... Misumena sp.) can change their coloration to match their background. Their venom is specifically potent to bees and flies. These spiders have good vision for movemant and this specimen was clearly aware of my presence.


Like most spiders the Long Jawed Orb Weaver (Tetragnatha sp.) snares its prey with a web.


The Halloween Pennant (Celithemis eponina) takes a more proactive approach and hunts its dinner. This species of dragonfly is a relatively weak flier.