Archive for Stiff Pen Shell

Jul
18

i Love Learning About Pen Shell Pearls

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Stiff Pen Shell with Blister pearl

While talking to Gary on our iLoveShelling shelling cruise last week, he told me about four huge HORSE CONCHS and other great shells he and his family Cameron, Mary and Lauren found on Sanibel during their visit from Nashville. Amazing!

Cameron, Mary, Lauren and Gary with large shells found in Sanibel

He also asked me if PEN SHELLS could make PEARLS and I immediately answered “It’s rare to find the PEARLS washed up on the beach but… Yes they can!”. He found something that looked like a PEARL inside a PEN SHELL while looking for other shells like TRUE TULIPS which can hide or get trapped inside them (CLICK HERE for a video to show this). Of course I had to see it.

Gary and Lauren from Tennessee find a blistered Pen shell pearl

If you look closely, you can see a milky circle on the inside of his shell and at about “9 o’clock” on that circle (the MOLLUSK’s muscle scar where it was connected to the shell) you can see a little ball on the shell. That’s a PEARL.

Stiff Pen shell muscle scar with blister pearl

This type of PEARL is called a BLISTER PEARL. Cool! BLISTER PEARLS are attached to the shell so mostly likely the PEARL would break if he tried pop it out to make any jewelry from it but it’s still cool for him to have seen it…. questioned it…. and ask me about it so we can all learn more.

Blister Pearl on the shell of a Stiff Pen shell

The only reason I knew anything about PEN SHELL PEARLS was by seeing my friend Rachel Fields’ scientific display at the Sanibel Shell Festival this year…about Natural Pearls and being fascinated by her blue ribbon exhibit.

rachel fields natural pearls display sanibel shell festival

After sending her photos of Gary’s PEN SHELL, Rachel responded by saying…

That does look like a pearl!  It’s called a blister pearl when formation occurs and the growth is still attached to the shell”.  

Then she explained “When pearls form often times it happens because some exterior object kind of puts pressure on and crushes the shell inward causing a piece of the shell to fall off into the body of the mollusk and if it happens near the mantle the mollusk will secrete a protective coating around that piece of shell that’s broken off.  Sometimes it happens far away from the shell and more internal which causes free-formed pearls and sometimes it happens up against the side of the shell which causes the pearl to form merged to the shell (and is called a blister pearl)”.

Now you can see from Gary’s shell that his PEARL formed against the shell and it still attached…. a BLISTER PEARL. Yep, it’s just like our type of skin blisters although we make just fluid inside our blister instead of a PEARL, right? When I get a blister, I’d much rather go through the pain to get a PEARL instead of crummy fluid. LOL

Formed blister pearl in stiff pen shell

When a PEN SHELL produces a FREE-FORM PEARL, it can be a gorgeous lustrous PEARL like Rachel showed in her exhibit. The problem with finding pretty PEN PEARLS is that they crack easily after a week or two and if they do make it without cracking, it may take about 4 or 5 years for them to become pearlescent.

Pen shell Atrina rigida with Pearl

But when they don’t crack and become lustrous…. Gorgeous!

Pen shell pearl from Atrina rigida

Rachel was kind enough to share more information from her Natural Pearl presentation, so I thought it would be easier to publish a page dedicated to her research- CLICK HERE. This will probably answer all of your questions because it answered mine! Like… “What other shells make PEARLS?”.

She shows us QUAHOGS…

Mercenaria Quahog pearls

QUEEN CONCHS produce PEARLS as well- They are pink! Captain Brian let me borrow his book Pink Pearl: A Natural Treasure of the Caribbean before we went on a shelling trip to Turks and Caicos last year so I could study up and keep my eye out for them. Of course its like looking for a needle in a haystack but you bet your bottom sand dollar… I searched. After I returned Capt Brian’s book, I realized how stinkin expensive it is- wow! (so happy I didn’t damage it!) If you have an extra copy laying around that’s not expensive, let me know- Rachel should have a copy!

Strombus gigas queen conch pink pearls

This one should really get your goat… a LION’S PAW. Oh my! Just to find a LION’S PAW is special… but to find a LION’S PAW PEARL? That would send me two clouds above nine!

Nodipecten subnodosus Lions Paw Pearls

Thank you Gary, Mary, Cameron and Lauren for coming on the iLoveShelling cruise with me and asking me about your PEN SHELL PEARL and also to Rachel (NYC) for sharing so much invaluable information with all of us about Natural Pearls. This is another example about why i Love Shelling, Shellers and the Shelling Community! It’s so edshellcational!

CLICK HERE to see and learn more from Rachel’s Natural Pearls exhibit and more photos.

rachel fields natural pearl exhibit

Feb
27

I Found A Half Naked Shell

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half naked pen shell atrina seminuda

No, you silly goose, this shell doesn’t have a bikini on… it’s really called a HALF-NAKED PEN SHELL! I found this rare PEN SHELL (Atrina seminuda) at Gulfside City Park on Sanibel Island, Florida a few weeks ago just after high west winds so there were thousands of shells that washed up on the beach. Talk about being silly… remember my crazy post “On The Beach With Shell Eggs And Ham, Pam-I-Am“? Well that’s when I found this very rare PEN SHELL. When I say “very rare” I mean it’s very rare for Southwest Florida. 

half-naked pen shell found on sanibel southwest florida

Okay wait….before you get bored with hearing about the not-so-attractive PEN SHELL, this is actually pretty dang cool, so go get some caffeine and stay with me, alright? And really, haven’t you seen tons of these shells if you’ve visited the west coast of Florida?

Last year when Shelling Sistah Susan H was here, she asked me if I had ever run into a third type of PEN SHELL  (the HALF NAKED) and told me to look at a picture of it online CLICK HERE. I studied the differences between this one and the STIFF PEN SHELL and the SAW TOOTH PEN SHELL. Okay, I’ve got it in my brain… if it’s here, I’m gonna find it. I searched for an entire year to find this stinkin thing! But I found it! I think I was just as excited when I found my JUNONIA… not.

I don’t think you will ever be collecting oodles of PEN SHELLS, (I’m not sure I know anybody who actually “collects” them) but it was sure exciting to me to finally find the darn thing. The only way to really tell it apart from the other PENS is to look at the inside muscle scar of the MOLLUSK… in other words- where the meat attached to the shell.

interior atrina pen shells southwest florida gulf

There is a slight variance on the outside of each of these shells. From left to right… STIFF PEN SHELL, HALF-NAKED PEN SHELL and SAW TOOTH PEN SHELL. I’m not really sure if you’ll be able to see the difference from this photo, but look very closely at the right side of each of the shells. That’s the hinge.. and it is very straight on the first and third shell but slightly curved on the middle one. So now that you know that the HALF-NAKED has a curved hinge, go back to the last photo with all 3 shells and see the big gap in-between the valves of the middle shell. That’s why I even picked up the shell in the first place, I saw that slight curved hinge and immediately thought to myself… OMG maybe that’s it!

atrina pen shell differences

Maybe this is a better view of the curve in the hinge… on the left is the HALF-NAKED and on the right is the STIFF PEN SHELL. Can you see it now?

the difference in pen shells

This is the real giveaway on the difference between these shells. The middle one is the HALF-NAKED (isn’t that just the funniest name? I get so tickled every time I say it!). Can you see more lines and shapes on the HALF NAKED right in the middle of the shell?

interior valve atrina pen shells seminuda difference

The next photo is a close-up of that shell and it almost looks like a face, right? Do you see the “eyes”? Okay, that is the muscle scar. Right above the “eyes” is a wide milky space before it changes complete color (like a hair line). The whole milky or pearly area is called the nacreous. The HALF-NAKED is the only one of our PENS that the muscle scar leaves such a prominent space below the nacreous border.

atrina seminuda muscle scar and nacreous

This next one is the STIFF PEN SHELL… the most common PEN SHELL on our beaches and it looks almost identical to the HALF- NAKED. I’m sure you’ve all seen this one if you’ve walked on the beaches in Sanibel or Captiva and you’ve probably cussed at it after you stepped on it, right? Ouch!

stiff pen shell atria rigida

Here’s the interior of the STIFF PEN. It’s hard to see the muscle scar on this one but there is definitely no obvious space between the top of the muscle scar and the border of the pearly part.

stiff pen shell atria rigida nacreous

This next one is the SAWTOOTH PEN SHELL. This one is easy to tell the difference from the others since it is much lighter in color and it has much smaller spines that don’t stick out (to cut your foot). I didn’t do a close up of the interior nacreous area because it didn’t really show up well… and …. wait! wake up! I’m just getting to the good part so gulp more caffeine, would ya? LOL

saw tooth pen shell atria serrata

This is how I found my first HALF-NAKED PEN laying on the beach at Gulfside City Park.

half naked pen shell at gulfisde city park

I took the shell to Dr. Jose Leal at the Bailey-Matthews Shell Museum to get a positive ID from him. He positively identified it for me as the Atrina seminuda (HALF NAKED) and then told me that they did not have one of these shells at the museum. Since it was my first one I’ve ever found, I told him he could borrow it to photograph it.  I know, I know, it sounds stingy that I didn’t donate it to him but geeeeez, remember…. Ive been looking for this guy for a year!

The first one I took to him to get a positive ID wasn’t so pretty and it cracked a little when I opened it up to look at the muscle scar…

sanibel atria seminuda pen shell

So I went hunting again and low and behold… I found two more after looking at thousands of them all along Sanibel. Gulfside City Park was the winner again. I found a perfect one with no cracks that I’ve shown in my photos here and I donated this one to The Bailey-Matthews Shell Museum…

half naked pen shell atrina seminuda

They will soon have it on their website as a Southwest Florida shell and have my shell in the photo. And yes, it’s still the only one they have so far- Dr Leal looked in the archives and couldn’t find another one. I’m so proud of that little PEN SHELL! Hahaha- Really, Who would have thought I’d ever be so happy about a PEN SHELL. heehee. And I would never have known to look for it if it hadn’t been for sweet Susan H! Thank you Susan H for asking me about it and giving me something to hunt for. I always love to find new things on the beach!

i Love Shelling

smaller sea urchin sanibel beach bling

SEA URCHINS! I haven’t seen SEA URCHINS washed up on our shores in quite a while… much less cutie itty bitty ones like this.

small size sea urchin sanibel island florida

I found dried tiny ones with spines as well…

tiny dried sea urchin sanibel beach

Normally if SEA URCHINS still have their spines in tact I would assume they were still alive and put them back in the water. But I found these in the highest wrack line at Lighthouse Beach. They had been cast on shore by those rough waves from the high winds last week with the high tide and got caught in the “sea weeds” then left for days to dry out. They look like the gumballs that the Sweetgum trees drop in the winter up north, dont they? LOL

sea urchin gum balls sanibel florida

I normally don’t get so excited to collect PEN SHELLS (since we see them so often on our beaches) but I rarely see perfectly intact baby STIFF PEN SHELLS (on the left of my hand) and SAW TOOTH PENS SHELLS especially with no BARNACLES or SLIPPER SHELLS attached to them. They are so cute!

stiff pen shell saw tooth pen shell

See how thick this wrack line was? Some people in other parts of the world might think this was an ugly site on a beach… but not me and most beach combers. This is a haven for shells and BEACH BLING for beach combers and for wildlife as well. Thick wrack lines like this packed with all sort of vegetation and other sealife are so important for our beach ecosystem. They provide food for birds and other wildlife as well as providing a layer to trap sand  for less erosion. They become incubators for dunes!

macro algae cast on shore Sanibel Island Florida

But… Just to make sure this seaweed was a natural occurrence without being harmful, I asked my friend and director of the Sanibel Captiva Conservation Foundation (SCCF) Dr. Eric Milbrandt if he knew what types of matter had washed ashore. Of course he did! He said “There were 8 species from collections at Moonshadows beach and the Lighthouse beach. Many of the specimens had intact holdfasts and given the recent > 1 m wave heights, were likely attached and cast on shore. Many of these species are found at nearshore hardbottom areas (the same areas that produce many of the mollusc shells) whose abundance peaks in Nov.”  He also reported that most of these species of seaweed (macroalgae) were common on all coasts. Thank you Dr. Milbrandt!

macro algae wrack line on Sanibel island Florida beach

Along with the PEN SHELLS and SEA URCHINS tucked away in all that seaweed, Clark and I found hundreds of double DOSINIAS…

disk dosinias sanibel lighthouse beach florida

And a very cool completely intact dried (and non-stinky!) SPIDER CRAB…

spider crab on sea whip sanibel florida october

Clark found a double SAILORS EAR (CHANNELED DUCK CLAM) without any cracks. It’s funny, we rarely find them on the beach with both sides intact because they are just so dang delicate…

double sailors ear shell sanibel beach

I haven’t gotten a good dose of combing through cool BEACH BLING in a while so I was in haaaawg heaven. There were oodles of little micro shells, SEA WHIPS and other goodies so I could (and did) walk for miles and miles getting lost in discovering the fascinating gifts that Mother Nature leaves us on our beaches.

shells urchins sea whips crabs sanibel florida

dosina shell with tiny sea urchin sanibel florida