Spiders, Webs and Warning Signs – Okinawa, Japan

Posted on August 25, 2019 by Admin11

In the last few months, I have been searching for spiders with unique web designs. The stabilimentum serves a different function for different species of spiders. The Oval St. Andrew’s Cross Spider is a master at designing its web with an obvious warning sign. Researchers believe the X-like stabilimentum serves as a warning to prevent birds from destroying the web.

Theories why orb-weavers have specialized web decorations

Stabilize the web
Make the spider look much larger
Disguise itself / Camouflage
lure prey in (ultraviolet light)
Serve as a warning sign for large birds
An attractive piece of art/lure in a mate

Argiope aemula -X-factor

Octonoba yaeyamensis has a very unique stabilimentum. The pattern reminds me of the mysterious design the Amami pufferfish constructs to lure in the female.

What purpose does this design serve?

Hide under the web /disguise itself
Beautiful design to lure in a mate or insects
Deterrent- scare off larger animals to prevent web damage

Octonoba yaeyamensis

When I first found this spider it was hiding under the stabilimentum. It serves as camouflage and protection from ultraviolet light (sunblock strand). I found it in the open sunlight on a branching leaf.

Octonoba yaeyamensis

Another strange design possibly used to attract a mate or hypnotize insects.

Cyclosa ginnaga (female)

Eriophora yanbaruensis has a simple design, possibly used to attract a mate.

Eriophora yanbaruensis

Gleaming light created this beautiful spider web prism.

Spider web prism

I have always wondered if spiders are unknown musicians. Their web has to produce some type of sound frequency. The tension of the web gently plucked by the spider or just blowing in the wind.

Do spiders use attractive frequencies to lure in insects or mates?

Spider web prism

The next step is to photograph the x-shaped stabilimentum under ultraviolet light. stay tuned to see my results.

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

This site is also designed to help people identify the beautiful animals of Okinawa, basically to serve as an online nature reference guide. If you would like to make a contribution to support my mission, please click on the donation link paypal.me/maketheswitch4nature

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

The Fishing Spiders of the Yanbaru forest By Shawn Miller

Posted on February 8, 2019 by Admin11

The Okinawan fishing spider (Dolomedes orion) is one of the most unique spiders we have on the Island of Okinawa.

My fishing hole

Most fishing spiders are ambush predators. They have the ability to catch prey on the land, on the surface of the water and even underwater. Fishing spiders use vibrations to attract insects like water striders. The spiders vibrations simulate a helpless insect floating on the surface of the water.

Dolomedes sp, Iriomote Island

I have seen amazing photographs of these fishing spiders eating frogs. I personally have observed Dolomedes orion eating insects only.

Dolomedes orion hunting

The beautiful color contrast allows them to blend in with their surrounding environment to avoid being seen.

Dolomedes orion feeding

It is thought that the white reflective leg sections are used to lure in prey when hunting during the daytime, but do they serve a purpose at night?

MYN Technique

Look close, the female fishing spider handles her egg sack with extreme care.

Female protecting her egg sack

Meet Spi-Zilla, This is an average healthy specimen found in the Yanbaru forest.

Huge spiders on Okinawa

I used my iPhone to compare the size of this huge spider, I kept my distance for sure.

Iphone comparison, Thanks R Shobe

Please be respectful to the wildlife. If they show any signs of stress or aggression give them their space and move on. Learn more about the Huntsmen spiders of Okinawa

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help worldwide conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support. Shawn M Miller.

House Dwelling Huntsman Spiders of Okinawa by Shawn Miller

Posted on September 17, 2018 by Admin11

Have you ever been bitten by a spider?

In 2014, I was bitten by a large huntsman spider (Heteropoda ventoria) in my apartment. It was completely my fault, I failed to check my clogs before putting them on. All spiders are venomous and I was fortunate not to have an allergic reaction to the bite.

Natural habitat

The Huntsman spider is the most common spider on Okinawa. It is often found in houses, workplaces, gardens, parks and sometimes inside vehicles. They are fast moving and are capable of jumping at fast speeds.

Spiders have tiny hairs called setules. These hairs allow the spider to cling to slippery surfaces and vehicles traveling at high speeds. You can’t shake this spider!

Spider on the windshield

I have heard stories of them being as big as a basketball, but these were all just exaggerations from people terrified of spiders. The largest specimens get about fist size.

Large huntsman spider

They feed on a variety of insects, frogs, and other spiders.

Heteropoda simplex

The female huntsman handles her egg sack with extreme care.

Huntsman spider

Stayed tuned! I’ll share the best way to safely catch and remove the huntsman spider from your living space.

Spider shadow

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support. Shawn M Miller.

Psychedelic Spiders of Okinawa by Shawn Miller

Posted on July 30, 2018 by Admin11

I have been photographing fluorescence for over five years now. Mainly underwater but lately I have been testing the technique on land. I often find insects, spiders, and plants that fluoresce using a specialized Light&Motion Sola Nightsea light. Some of the micro-spiders fluoresce brightly under blue light, the challenge is to get an acceptable photograph.

Below are some comparison photographs of spiders. The first photograph was taken under blue light and the second under white light using on-camera flash. All the spiders were photographed in their natural habitat on the beautiful Island of Okinawa.

Yanbaru jumping spider

The custom Light & Motion fluorescence setup for these land-based subjects.

Fluorescence photography setup -Shawn Miller

The giant wood spiders (Nephila maculata) of Okinawa fluoresce under UV light.

giant wood spiders (Nephila maculata)

Giant wood spiders (Nephila maculata)

I used my nauticam underwater setup with NIGHTSEA’s fluorescence excitation filters to photograph the wood spiders.

Nauticam Fluorescence setup

My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

Your donations will help conservation initiatives as well as bring solutions to the worldwide pollution issues on our beautiful shorelines. Thank you for your support, Shawn M Miller.

#MakeTheSwitch4Nature

Light&Motion exploration lights – https://www.lightandmotion.com/the-perfect-light

Okinawa Nature Photography

沖縄自然写真 By Shawn Miller

Category Archives: spiders of Okinawa

Spiders, Webs and Warning Signs – Okinawa, Japan

The Fishing Spiders of the Yanbaru forest By Shawn Miller

House Dwelling Huntsman Spiders of Okinawa by Shawn Miller

Psychedelic Spiders of Okinawa by Shawn Miller