Sign Challenge #1 Reveal: Spinybacked Spider Egg sac

February 10th, 2013 - 12:25 PM | Filed under Sign Challenges | 2 Comments

This reveal for Sign Challenge #1 is long overdue. Here’s the challenge photo again:

~15mm long | August 23, 2012 | Sebring, FL, USA

~15mm long | August 23, 2012 | Sebring, FL, USA

Commenter Daniel Heald correct guessed it was a spider egg sac. Here’s another angle:

Dorsal view

Dorsal view

When I took the photos, I assumed it was a cocoon. I was curious to see what moth would emerge, so I took it home with me.

After looking through Tracks & Sign of Insects and Other Invertebrates, I realized it was actually an egg sac for a Spinybacked spider (Gasteracantha cancriformis). In fact, I had seen many of those spiders in the area. The egg sac’s yellow silk, dark longitudinal line, and placement on the underside of a leaf all point to this species.

In Spiders of the Carolinas, L. L. Gaddy notes that in over twenty years of fieldwork he’s not seen the egg sac or male of this species. Perhaps I’m just lucky, but I suspect I’m more of a leaf flipper than Gaddy. The egg sacs are placed on the undersides of leaves, which is where I’m always checking for caterpillars.

I was curious to see the spider eggs, so I peeled back a few layers of the silk and found the spiderlings had already hatched. Turns out they stay in the egg sac for weeks before emerging.

Spiderlings revealed

Spiderlings revealed

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Closer look

I had hoped to see the spiderlings grow, but they all died after a few weeks.

References:

Spiders of the Carolinas
by L. L. Gaddy
Tracks & Sign of Insects and Other Invertebrates:
A Guide to North American Species

by Charley Eiseman and Noah Charney

Female Amanda’s Pennant

October 8th, 2012 - 9:07 PM | Filed under Featured Photos | 3 Comments

~30mm long | August 22, 2012 | Allen David Broussard Catfish Creek Preserve, Haines City, Fl, USA

A female Amanda’s Pennant, Celithemis amanda, perches along a sandy trail in a relatively unvisited state park.

Sign Challenge #1

September 18th, 2012 - 9:22 PM | Filed under Sign Challenges | 5 Comments

This’ll be the first in a new series of challenges focused on sign. What is “sign”, you might be asking? Generally, it’s something whose presence indicates the presence of something else. Here on this blog, of course, I’m referring to sign in nature. That could be tracks an animal left behind, scat or other droppings, a shed skin, feeding damage, and so on.

So, with that in mind, what is this sign and what critter does it reveal?

~15mm long | August 23, 2012 | Sebring, FL, USA

I highly recommend Tracks & Sign of Insects and Other Invertebrates. I find that it’s one of my most used references of late. If you already have it, you’ll find the answer to this challenge in it.

Tracks & Sign of Insects and Other Invertebrates:
A Guide to North American Species

by Charley Eiseman and Noah Charney

 

2012 International Rock Flipping Day

September 10th, 2012 - 10:33 PM | Filed under Featured Photos | 3 Comments

Yesterday was International Rock Flipping Day. I’ve read about it in the past, but this is the first year I’m participating.

I don’t really need an excuse to flip a rock and explore what’s beneath, but the whole event certainly motivated me to get my blog posts going again. I have been busy outside of blogging, so there’s plenty of good stuff coming up, so don’t give up on me.

Yesterday was beautiful here in my area, so I already had plans to go bug hunting. Knowing I’d be looking for a rock to flip, I chose a nearby park where I knew there were lots of good candidates. Here’s the rock I settled on after being distracted by lots of other interesting critters along the way.

A stone lies on the sun-dappled floor of an eastern deciduous forest, begging to be flipped.

I carefully turned over the rock, hoping for something blogworthy. On the ground beneath, a centipede uncoiled, drawing my initial interest. Scanning the scene, I also saw a millipede and a few ants. Then, movement on the underside of the rock itself drew my attention. A harvestman in the family Cosmetidae betrayed its presence.

~5mm body | September 9, 2012 | Roswell, GA, USA

I’ve seen this type of harvestman before, and a photo of that one submitted to BugGuide has since been identified as belonging to the genus Vonones.

Here are some of my favorite shots of this harvestman, the only thing from that rock that I chose to photograph for the 2012 International Rock Flipping Day.

Coming over a ridge in the rock and exposing some interesting anatomy.

The harvestman shows its butt.

Having made its way around to the top of the rock, the harvestman continues its evasive maneuvers.

Tiring now from the constant corralling of the photographer, it attempts a stare-down.

The photographer having tired of the chase, the harvestman finally escapes.

 

Striped Anole, Displaying

July 14th, 2012 - 10:22 PM | Filed under Featured Photos | No comments

April 23, 2012 | Arikok National Park, Aruba

The Striped Anole, Anolis lineatus, was probably the species of lizard I most encountered in Aruba. I assume the common and scientific names refer to those dark broken lateral stripes, but it’s known locally as Waltaka.

Here’s another one, a female perhaps.

Female? Or a young male?

My earlier post of the lizard on a tree is also one.

After a good bit of googling, I came across a good free resource on the reptiles and amphibians of Aruba, link below.

Reference:

Amphibians and Reptiles of Aruba
by R. Andrew Odum
PDF hosted at WildAruba

Yellow/Black Treehoppers with Ants

July 14th, 2012 - 9:06 PM | Filed under Featured Photos | No comments

~5mm | January 7, 2012 | Tupaciguara, Minas Gerais, Brazil

Here’s yet a different species of colorful treehopper. These too were found in association with ants.

A busy photo, but packed with natural history.

Poison Ivy Caterpillar / Dimorphic Macalla Moth

May 20th, 2012 - 4:36 PM | Filed under Featured Photos | 3 Comments

For many years I’ve noticed colorful little caterpillars that live individually in silken retreats on the surface of leaves of poison ivy. At a recent BugGuide gathering, a photo of one of these caterpillars was shown and I realized we still didn’t know what these were. I resolved then to rear a few to try and arrive at an identification. There’s plenty of poison ivy near my home, so I didn’t anticipate much trouble finding a few.

Here’s the first one I found. The white area just behind the head is atypical. The caterpillar is smaller than usual, so it might be an early instar. It could also represent some sort of injury.

13mm | August 20, 2011 | Roswell, GA, USA

The next day I collected another one, larger.

20mm | August 21, 2011 | Roswell, GA, USA

The next weekend I collected one more.

20mm | August 27, 2011 | Roswell, GA, USA

Here’s a cropped version of the image above, showing the head. Checking these specimens and other photos on BugGuide, there appears to be quite a bit of variability in the head coloration. They all have a white band across the lower part of the head capsule though.

Closeup of head

At that point I figured I had a good chance of successfully rearing at least one.

The last one I collected was the first to pupate. A few days before pupating it started to change color. That’s not unusual for caterpillars as they prepare to pupate. In this case it darkened to become more orange.

Prepupal stage of final instar | 9 September 2011

Another closeup of head

I neglected to photograph any of the pupae.

Earlier this month, an adult eclosed. It’s attractive and quite distinguished looking with an elaborate headdress.

20mm wingspan | 4 May 2012

Lateral view

Front view

Closeup of head

After searching through various guides, I decided this must be what’s currently known as Macalla superatalis. My books actually identified it as part of a genus it was previously placed in, Epipaschia. The common name, Dimorphic Macalla (previously Dimorphic Epipaschia), refers to the fact that it comes in two color forms: green as above, or tan.

Having arrived at the identification, I checked BugGuide and found that someone had beat me to the identification based on a literature search. Oh well, it looks like I might be the first there to have successfully reared them though.

References:

A Field Guide to Moths of Eastern North America
by Charles V. Covell, Jr.
Peterson Field Guide to Moths of Northeastern North America
by David Beadle and Seabrooke Leckie

Another Unidentified Caterpillar

April 30th, 2012 - 10:04 PM | Filed under Featured Photos | No comments

~30mm | January 7, 2012 | Tupaciguara, Minas Gerais, Brazil

Even though I can’t identify it, it’s pretty enough that I had to post it.

Jumping Spider with Hooked Chelicerae

February 13th, 2012 - 8:20 PM | Filed under Featured Photos | 1 Comment

5mm body | July 8, 2011 | Victorio Siqueroli Park, Uberlandia, Minas Gerais, Brazil

This attractive male jumping spider has some interesting hooks on his chelicerae. Take a closer look at this crop from the image above.

Hooked chelicerae

He really has a lot going on colorwise as well. I imagine those banded front legs might be used in some sort of courtship ritual. One has to wonder if and when those hooks come into play though.

Dorsal view

 

Barklice

February 12th, 2012 - 2:14 PM | Filed under Featured Photos | No comments

9mm long | July 8, 2011 | Victorio Siqueroli Park, Uberlandia, Minas Gerais, Brazil

Because they are gregarious, one rarely sees a lone barklouse. I was surprised to find this one by itself on a leaf. There might have been a group nearby, but I didn’t find them.

Elsewhere in the park though, I did find an aggregation.

Barklice on the side of a tree

Closer view