The Most Beautiful Bivalve In The World – Pedum spondyloideum

The Coral scallop (Pedum spondyloideum) is the most beautiful animal I have encountered underwater. The delicate bivalve lives within the hard coral its entire life.

  • Scientific name: Pedum spondyloideum
  • Distribution:  Ryukyu Islands
  • Habitat:  Hard corals in shallow water
  • Diet: Filter feeders
  • Average Size:  35mm-55mm

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What purpose do they serve in the ecosystem? Researchers believe these beautiful bivalves serve a beneficial function among hard corals.

  • Provide circulation for feeding coral
  • Defend the host by expelling water when threatened by corallivorous marine life

The hard coral provides the bivalve with support and protection. The shell is very thin and fragile. Below is a great example of a protected piece of coral with an army of coral scallops.

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The crown of thorns starfish is the most devesting predator of the coral. If the coral (host) dies the bivalve will not survive.

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The coral scallop is very thin and fragile. The living animal is much more beautiful than the protective shell it produces. These specimens were given to me by a fellow researcher.

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I first started photographing these beauties in 2010, below are some of my favorite images taken throughout the Ryukyu Islands.

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 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

Testing the Nauticam NA-D500 Underwater housing

It’s been a blast shooting with the Nikon D500 DSLR combined with the Nauticam Na-D500 housing. I am pleased with the superior quality and design of the entire system. My underwater rig is setup for shooting macro with two Sea & Sea YS-D2 strobes and a variety of Sola lights.  I customized it slightly by mounting a Light & Motion Sola compact tray and loc-line arm kit to the bottom of the housing. This allows me to easily attach other Sola lights underwater based on my vision.

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Nauticam NA-D500 shower

My favorite features of the Nauticam NA-500 Underwater housing 

  • Internal camera lock-to prevent movement
  • Vacuum and leak detection system, Green is good!
  • Port lock system and audible housing lock latches
  • Super responsive optic flash system
  • Comfortable hand grips

I tested the Nikon D500 system with the Nikon AF-S Micro NIKKOR 60mm f/2.8G ED lens and the Nikon AF-S DX Micro NIKKOR 40mm f/2.8G lens.  Both are responsive and quality pieces of glass. The great news is that they 40mm is compatible in the NAU-18701 port as well.

Below are my favorite fourteen photographs taken with the D500 underwater in the beautiful waters of Okinawa.

Bobtail Squid - D500|40mm

Bobtail Squid – D500|40mm

Hermit crab - D500|40mm

Hermit crab – D500|40mm

Reef squid D500|60mm

Reef squid D500|60mm

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Nudibranch D500|40mm

Chromodoris hintuanensis

Chromodoris hintuanensis D500|60mm

Painpot cuttle fish okinawa

Paintpot cuttlefish D500|60mm

Dinahs Goby D500|60mm

Dinahs Goby D500|60mm

Flatworm D500|60mm

Flatworm D500|60mm

eyes of blue

Ryukyu Eyes D500|40mm

Pontoh's Pygmy Seahorse D500|60mm

Pontoh’s Pygmy Seahorse D500|60mm

Fluorescence Nikon| 60mm

Fluorescence Nikon| 60mm

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Bobtail squid D500|60mm

Bobtail squid D500|60mm

Eyes of Okinawa D500 | 60mm

Eyes of Okinawa D500 | 60mm

If your planning on buying a Nauticam underwater housing online, I recommend Bluewater Photo, they are extremely knowledgable and have outstanding customer service.

I want to thank Black Fin Grouper, Light & Motion and Nightsea for all their continuous support over the years. Thank you!

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