Tag Archives: spinybacked orbweaver (Gasteracantha cancriformis)

Walking with spiders – Part 2

Despite my passion for creepy crawlies (i.e., insects, arachnids, etc.) and my passion for flowers and my passion for—well, you get the point—despite my love of the smaller joys nature provides, I have yet to invest in a macro lens.  Times are tough and finances are tight, so I don’t see such an investment happening soon.  Nevertheless, I can’t allow lack of equipment to interfere with my desire to see and photograph as much life as I can find.

Female filmy dome spider (Neriene radiata) hanging on her web (2009_07_07_026162)

This female filmy dome spider (Neriene radiata) built her web alongside a creek in the shade of surrounding trees.  Hardly more than a hand’s width above the ground, she patiently hung from the underside of the web as she waited for a meal to drop by.  These small, delicate spiders have a habit of building webs anchored at multiple points vertically, and that design effort creates a domed sheet web unlike anything I’ve ever seen before.  Getting her photograph proved challenging with her nearness to the ground and the shape of her food trap—especially with me trying desperately to avoid snagging or breaking any of the anchor lines—yet she sat quietly and never budged as I contorted myself into odd shapes looking for at least one reasonable view.

Female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) eating prey (2009_09_26_029375)

Still nibbling on prey which long before had stopped being identifiable, this female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) soaked up some rays at the woodland edge.  The floodplain stretched out before her like a living smorgasbord of food.  Behind her, thicket at the drip line gave way to riparian woodlands.  Her position offered her a delectable banquet of goodies on which to feast while she prepared to create her first egg sac.  I had hopes that a mild winter would allow her to survive (females of this species, when they survive the winter, live into the following year whilst continuing to grow, hence they become massive).  Unfortunately for her and for my hopes, our winter started early and hard freezes have already occurred…with more on the way.  No matter: her children will survive and they will take her place at the dining table starting next spring.

Wolf spider (Hogna sp.) standing on a leaf (2009_09_06_028837)

One of the joys of photography comes from discovering surprises in the frame when you review the images later.  Thus was the case with this wolf spider (Hogna sp.).  I knelt in mud and flooded grass trying to get a picture of a cricket frog.  Such frogs are small, mind you, and they vanish quickly beneath even the shortest ground cover.  But later that day when I looked at the results, there in the depth of field stood this little hunter whose stillness and shadow-like colors kept me from seeing it to begin with.

Female spinybacked orbweaver (a.k.a. crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider or smiley face spider; Gasteracantha cancriformis) with freshly caught prey (2009_10_03_030591)

I never for a moment thought I could get a respectable image of this female spinybacked orbweaver (a.k.a. crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider or smiley face spider; Gasteracantha cancriformis).  I stood on the opposite side of a large creek from where she and her web hung in the shadows.  In fact, I didn’t realize she was there until a small insect hit her trap and she scampered off to grab it.  I waited for her to return to the center of the web before I tried to get her photo.  Despite their unique appearance, these spiders tend toward the small end of the scale and usually go undiscovered until someone walks through their web.

Female funnel-web grass spider (Agelenopsis sp.) with freshly caught leafhopper (2009_10_17_031931)

With heavy dew on the ground, seeing this female funnel-web grass spider (Agelenopsis sp.) proved easy: a small plot of land no larger than a car had four shimmering traps stretched across the wet grass.  Thankfully she caught a small leafhopper just as I took her photo.  You can barely see it there near her mouth.  Here’s another view that makes the prey a tad easier to see.

Female funnel-web grass spider (Agelenopsis sp.) with freshly caught leafhopper (2009_10_17_031934)

Interestingly enough, grass spiders like this do not spin webs that are sticky.  The silk dries and serves a more net-like purpose, trapping insects by entwining them when they land and keeping the critters held for a second or two.  Just long enough for the spider to erupt from the funnel, grab and bite the prey, then return with it into the recesses of their web where they remain unseen.  This helps ensure other insects don’t associate the web with danger, and it also helps the spider enjoy its meal without interruption.

Female barn spider (Neoscona crucifera) sitting in the middle of her orb web (2009_10_10_031233)

And finally a barn spider (Neoscona crucifera).  Often confused with the spotted orbweaver (a.k.a. cross spider; Neoscona domiciliorum), the barn spider will be the focus of part 3 of this series.  Why one post dedicated to one kind of spider?  Because just when you thought it was difficult to differentiate one species from another or one gender from another, wait until you see how polymorphism makes this species a real challenge to identify.

Consolation prizes

Mom and I wandered about the farm Saturday on a quest for interesting things to photograph.  Well, in truth our search focused primarily on black widow spiders.

We know they inhabit the area and skulk about the various buildings and surrounding woods.  Finding them proved to be a challenge, however, and that despite the many hiding places we uncovered, flipped over, lifted, and peered behind, under, over and through.

I even tried to convince Mom to crawl beneath the house as I was certain we could find some there.  She refused.  Vehemently.  I was disappointed with her of course.  She passed up a great opportunity for discovery…

Our travels notwithstanding, we found nary a single black widow spider, at least not one willing to pose for us (I’m sure a few scampered off into the shadows as we pillaged their cover).

Nevertheless, we stumbled upon a handful of arachnids who didn’t flee at our lumbering approach.

Special note: This is the time when you should look away, nathalie with an h.  Eight-legged critters ahead…

A female arabesque orbweaver (Neoscona arabesca) clinging to the center of her web (20081011_13562)

I only captured one presentable photo of this female arabesque orbweaver (Neoscona arabesca).  Her massive silken trap spanned the distance from ground to the outside eaves of the house (probably three meters/yards).  Unfortunately for me, that large space meant the web succumbed to the light breeze with striking regularity, and the spider herself swayed like a trapeze artist preparing to make a dashing and dangerous leap.

Standing beneath her facing the dark porch ceiling in the background, I found little contrast with which to memorialize her presence.  From behind her I found only bright blue sky to cloak her image.  Damn it!

A female spinybacked orbweaver (a.k.a. crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider or smiley face spider; Gasteracantha cancriformis) clinging to the center of her web (20081011_13713)

Neither Mom nor Dad had a clue as to this creature’s identity.  As short-lived as her life will be, I was surprised she survived long enough for my mother to remember her and bring me to her location for help in putting a name to the beast.

By that picture alone she is recognizable, the only spider in North America with both of the telltale traits that define her: the abdominal carapace spines and the pattern of spots.

That happens to be a female spinybacked orbweaver (Gasteracantha cancriformis).  It comes as no surprise that she is also known as a crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider and, most importantly, a smiley face spider.

A female spinybacked orbweaver (a.k.a. crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider or smiley face spider; Gasteracantha cancriformis) clinging to the center of her web (20081011_13654)

Like the arachnid before her, the day’s light winds made photography nearly impossible, although in her case that was much more apparent as her web rested at a 45° angle to the ground and her minuscule size provided no anchorage to weigh down her resting spot.  Each time I focused on her and pushed the button, she would sway leisurely toward or away from me.  That makes for impossible photography when working in macro mode (when dealing with very small subjects and a very tight depth of field).

A female spinybacked orbweaver (a.k.a. crab spider, spiny orbweaver, jewel spider, spiny-bellied orbweaver, jewel box spider or smiley face spider; Gasteracantha cancriformis) clinging to the center of her web (20081011_13705)

Challenges aside, I felt great pleasure in digitally capturing her.  This was the first opportunity I had to do as much.

A female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) hanging on the underside of her web (20081011_13695)

The black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia).  Ubiquitous yet mesmerizing, this female caught my attention as she rested against her web, a structure built on the south side of the purple morning glories my parents so enjoy.

A veritable horde of this species can be found no matter where one looks at the farm.  Growing from a tiny spiderling to a massive creature spanning the palm of my hand—legs not included, I mean—it’s difficult to miss them regardless of where one happens to rest one’s eyes.

Close-up of a female female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) as she clings to her web (20081011_13625)

Yet another female called home the area around the pigs.  From her first appearance here she has grown to the tune of at least tripling in size, if not quadrupling, and she has a long way to go.

She will double her mass before the end of her days.  She might even triple her mass.  When she is done growing, she will fill the palm of my hand without her legs being counted.

If she stretched her appendages to their furthest extent, at least once she’s fully grown, she would be able to encompass the whole of my hand with plenty of room to spare.

Close-up of a female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) showing the anchor line coming from her spinnerets (20081011_13622)

Disregarding the promise of her future, though, she made for a tolerant and beautiful subject.  When I focused on her abdomen, the anchor line from her spinnerets revealed itself, the safety harness with which she attaches to her web being an important part of her existence.

Like most spiders, although not all.

A female black & yellow argiope (a.k.a. yellow garden spider; Argiope aurantia) hanging on the underside of her web (20081011_13631)

Briefly did I poke the lens into her realm; briefly did I invade her space for a shot or two (not all of which are shown here).  What a patient and tolerant beast.  Her bite no worse than a wasp sting, perhaps she comprehended the challenge before her should she choose to fight me—or the camera.

I hope to see her at her prime, at her most mature stage before she hands the future over to generations she might never know.

A female green lynx spider (Peucetia viridans) resting atop a leaf (20081011_13681)

But what about the ambush predator, the one briefly touched upon a few months ago?

Mom drew my attention to one such beautiful monster also hidden amongst the purple morning glories.  This female green lynx spider (Peucetia viridans) cared little for our presence, reacting slowly and methodically as I invaded her territory.

A female green lynx spider (Peucetia viridans) resting atop a leaf (20081011_13674)

Perhaps my favorite arachnid species, she is an ambush predator, a stealthy bit of green upon a canvas of green.  She spins a tad of web for safety before taking her position near where she knows insects will follow: flowers.

Like a statue she waits.  Eventually an unsuspecting wasp, bee or fly will wander into her territory, will land upon some bloom within her purview.  Then she strikes.

A female green lynx spider (Peucetia viridans) resting atop a leaf (20081011_13683)

Resting the camera lens on the same leaf from which she hunted, or perhaps the place she chose for rest, I felt a tinge of surprise that she didn’t flee.  My experience with this species has always included a ready retreat when I invaded their territory.

So I got closer.

Close-up of a female green lynx spider (Peucetia viridans) resting atop a leaf (20081011_13688)

My heart leapt when she stood her ground no matter how close I pushed the camera.

Then again, I realized she held a distinct advantage: She can see in 360° at once without moving her body.  Atop her head rests a white cap, and the outline of that cap defines her field of view.  Apparent in that photo, all eight of her eyes circle her head: two facing backward, one facing each side, two facing directly forward, and two angled to either side of front.

My invasion posed no risk as she had a superior position, one that she knew included the whole of her surroundings.  No matter what I did, she always had in sight an escape route.