Hey, just got an update on my July Post "Glowing Eggs on Myrtle Beach" from the Assistant Interpretive Ranger at Myrtle Beach State Park.
I had sent her a letter asking if she might know what this was now that I had photos posted. She contacted the Interpretive Ranger at the Huntington Beach State Park who forwarded this suggestion...
"They look like juvenile jellyfish to me, but that doesn’t explain the bioluminescence. I wonder if they could be juvenile comb jellies; they are certainly bioluminescent. I think the air bubble is just a bubble trapped inside them."
I then did a bit of research on comb jellies (Mnemiopsis) and found this article at http://jrscience.wcp.muohio.edu (you can go to the link to read the full article)Scrolling down, I found this segment:
"Bioluminescence
What really created an interest in comb jellies for me was their bioluminescence. When I worked on the coast of Georgia, students and I would catch comb jellies during dock study. When we got back to the classroom to look at what we caught, the comb jellies would usually steal the show (only skeleton shrimp created more of a stir). The students would watch the comb jellies' cilia on the video cam, but the best part came when the lights were turned off. If it was dark enough and someone disturbed the comb jelly it would glow! The best was if the students saw comb jellies bioluminescence in shallow pools during their night walk.
The bioluminescence (cold light) on comb jellies comes from the gastrodermis cells in the walls of the meridional canals. This makes it look like the light is coming from the comb rows and giving an overall appearance of a pulse or blob of light. When disturbed, the comb jellies as well as many other marine organisms (jellyfish, siphonophores, deep sea squid, etc), glow with bioluminescence. Some of those mentioned (unclear if comb jellies do) lose their glowing tentacles or release a glowing cloud to distract predators (Waller, 1996)."
The way the glow occurs when disturbed and along it's outer layer makes me believe it's the best answer so far. I've found a PDF online that mentioned these characteristics, too...
If you want to see what they look like, check out Chai's Marine Life Blog: "Comb Jellies on the Cottesloe Reef". He's got geat pics and descriptions.
So this could be it. They're still doing a bit of research just to verify it. Many thanks to the Assistant Interpretive Ranger at Myrtle Beach State Park and the Interpretive Ranger at the Huntington Beach State Park for taking the time to look into this for me. I was at Myrtle Beach State Park Nature Center in July and they're wonderful people and they have interesting displays there, and there's lots to do at the park.
So next summer, when you're strolling along Myrtle Beach at night, watch your footsteps for those glowing eggs. They're really fascinating to see.