Archive for Dosinia
CLAMS, SCALLOPS and OYSTER shells. That’s what we’ve been seeing washed up on Sanibel beaches this week. Some experienced beachcombers might think this is a little boring since they have plenty of these bivalves and there weren’t many WHELKS and CONCHS to fill up their shell bag. But we always find interesting things and when Clark and I met Ilene, Dawn, Hudson and Ethan from St Petersburg, FL we saw they weren’t disappointed at this gorgeous evening either.
Ethan picked up an ARK SHELL with a hole in it and began telling me why certain shells drill holes in different areas of other shells. Oh wow- I just did a post on the different holes in shells last month so I wanted to know more. He told me that the further away the hole is from the hinge (what I call the “nose”), the predator mollusk is more stressed. If the predator drills near the hinge, he can get to all of the meat easily…but the shell is thicker there so it may take longer to drill. If the predator mollusk drilling the hole into the other mollusk is pretty desperate, he picks a spot that’s thinner and easier to drill but may not get much meat since the other mollusk might fight back or can slip away easier. A sign of a desperado. Thanks so much for such cool information, Ethan! BTW, Ethan teaches classes about Paleoceanography .
If I didn’t put you asleep on that explanation and you think this stuff is interesting too, here’s a photo of what I’m talking about. See the DOSINIA on the left with the perfect hole in the nose area and then look at the hole in the desperate CALICO CLAM with the hole in the middle of the shell. Why so desperate Mr. Murex? Okay, I’m not positive it’s a MUREX that made the hole but in my humble opinion, it sure looks like an OYSTER DRILL hole (part of the MUREX family). Take a look at my other post What Makes The Different Holes In Seashells?
Okay, lets get back to the beautiful shells… While we were all talking near Lighthouse Beach, Ilene showed me her pretty DOSINIA then I saw Hudson reach down and pick “candy” (juvie HORSE CONCH) right out of the shells at our toes. Clark then made a scoop in the water and pulled out a TRUE TULIP then gave it to them. Hmmmm, the shells looked like they were starting to come in but it was getting too dark to see.
Dawn just posted on iLoveShelling Facebook page this morning that they found all of these shells at Lighthouse Beach. Yes! The WHELKS and CONCHS are finally coming in… not that we were feeling desperate or anything. LOL
Thanks for posting, Dawn! Looks like we are going to be heading to Lighthouse Beach today to find some mermaid treasure but I’m really looking forward to our iLoveShelling cruise to Cayo Costa tomorrow with Captiva Cruises.
Join us and receive a $25 gift certificate for jewelry from Sealife By Congress. Call 239-472-5300 to reserve your spot for 9am.
i heart seashells. Shells have a way of talking to us, don’t they? They make us feel deeply connected to the vast sea and pull us towards it. This PONDEROUS ARK shell washed up at my feet with a heart carved in it. Awwwwe, so sweet! I love you too! But hmmmm… other than being an oh-so-sweet message from King Neptune, how did this happen?
We see natural holes drilled in all sorts of shells, so it’s time to find out how they are made. The hole in this SHARKS EYE tells me a little secret of what happened to its life. The clue? It has a perfect countersunk borehole with a beveled edge twice the diameter as the inner diameter. Because of the shape of that hole, you can bet that he was eaten by another SHARKS EYE! OMG They are cannibals!
We have to guess what happened to this next guy because it looks like a fellow predator SHARKS EYE started carving up his next meal but stopped before he tasted victory.
By looking at the hole in this DISK DOSINIA, I’m going to assume that a SHARKS EYE made a meal out of this guy too.
Geez, SHARKS EYES have a smorgasbord of choices for their buffet. Looks as though they like BUTTERCUP LUCINES too.
A straight hole with only a slight beveled edge like this LADY-IN-WAITING VENUS CLAM …
…was most likely drilled by some sort of MUREX… like GULF OYSTER DRILLS. Aha! That’s why they are called “DRILLS”!
The grooves in these CROSS BARRED VENUS CLAMS and TRANSVERSE ARK aren’t the handiwork of the SHARKS EYE or DRILLS. These grooves were most likely made by a BRISTLE WORM. It uses a rasping technique with its bristled body while secreting acid to etch a groove in the shell to make a nice cozy place to rest.
After Shellabaloo, she sent me this sweet CROSS-BARRED VENUS shell with a smiley face on it (made by a BRISTLE WORM). I keep it by my desk!
She also found a “K” on a CROSS BARRED VENUS…
Lisa was so thoughtful, she gave it to another Shellabaloo-er… Kendra. K for Kendra!
So let’s get back to that heart I received from King Neptune … these bigger holes most likely were drilled by a STIMPSON CHIMNEY CLAM. Oh, What? You’ve never heard of a STIMPSON CHIMNEY CLAM before? LOL Well, neither had I before I got so curious about what made that heart shape and found out that two separate drilled incidences by these clams are the most likely culprit. When I find a STIMPSON CHIMNEY CLAM, you will be the first one to know about it and I will post a photo. I already have an appreciation for them since they are quite the artists!
I just assumed that a shell with lots of little holes in like this was just from regular wear and rear by the salt and wave action… like when you wash and wear your favorite shirt too many times. One day, you’ll start to see holes in it! But some times shells that look like this tend to be “holey” because BORING SPONGES have invaded it as a living space.
I’ve always been drawn to shells that have holes for stringing them for crafts….
For gift tags…
And I always love to see someone string them for jewelry…
I would have never known where to start finding information on these cool holes in shells if Lisa from Shellabaloo 5 (OMG I just realized… both Lisas from different Shellabaloos are fascinated with holes in shells too! Ha! They need to know each other, wouldn’t you say?) anyway… I wouldn’t have known there was such a term as “Shell Bioerosion” and such if she hadn’t shown me where it was in this book Living Beaches of Georgia and the Carolinas .
There’s all kinds of fun to be had in exploring the common shells if you just give them a chance. They may even tell you a secret!
Did you know that there were two different DOSINIA shells that wash up from the Gulf Of Mexico on to the shores of Sanibel, Captiva and Southwest Florida? In my last post, I showed you so much BEACH BLING that washed up after high west winds and teased you with two DOSINIAS as well. It’s pretty common to see DISK DOSINIA (Dosinia discus) seashells on our beaches but it’s very difficult to tell them apart from their sister and more elusive shell… the ELEGANT DOSINIA (Dosinia elegant).
To identify most bivalve shells, it’s easier to look at their interior since the biggest differences show on the inside around the hinges and also where the MOLLUSK itself connected to the shell. But… just like the outside shape, color and thickness- the interior is so similar too on these shells that it’s still so hard to tell them apart.
The easiest way for me to distinguish the differences of the DISK DOSINIA from the ELEGANT DOSINIA is by looking closely at the outside grooves on the shell. The DISK is on the left and the ELEGANT is on the right of all of my photos. Now it’s a little easier to see a difference, right?
Notice how fine the grooves are on the left shell (DISK) compared to the coarse grooves of the shell on the right (ELEGANT). If you rub your thumb nail along the out side of each shell you can definitely tell the difference .
I know you can’t run your thumb over these shells I showed you in the photos but I hope I showed you enough detail so that you could identify each one in person. But let’s just see if you can still spot the differences in CYBERSHELLING! YAY! Okay, here goes…. How many ELEGANT DOSINIAS can you find in this next photo?
Hopefully, now you will be able to pick up a DOSINIA and impress your friends and family by telling them which type of DOSINIA you just found. (heehee)