The lightning whelk seashell (Busycon sinistrum) lives anywhere along the coastline of Florida. When I visited Sanibel Island there were many living whelks just offshore. I live on the East coast of Florida and have also found many lightning whelks – small ones – with hermit crabs inside.
Don’t collect shells which are inhabited by any living creature, whether it is the mollusk (as in my photo here) or a crab. Take a photo and put it back where it was found.
The lightning whelk can reach a length of around sixteen inches. It has a long opening, or aperture, down the entire side. Seashells that have a similar appearance are the knobbed whelk, channeled whelk, and pear whelk, but the lightning whelk has a unique characteristic. It is sinistral, or left-handed.
The aperture is on the left side and this differentiates it from other similar gastropods. It is very easy to see when holding the shell from the pointed bottom.
In my photo below I compare a juvenile lightning whelk to another seashell. That little shell was a mystery to me until I realized it had a left side opening… then suddenly it dawned on me – lightning whelk!
Juvenile Lightning Whelk – Right
See my own pictures of this seashell at the Lighting Whelk page.
Pictures and information about the lightning whelk marine snail which is a rarely found sinistral shell.
One pretty seashell you may find if vacationing along coast of Florida is the lightning whelk (Busycon contrarium).
It is commonly found along the southern United States beaches from the Carolinas to Texas, and is the state shell of Texas.
The Rare Sinistral Seashell
The shell is easily recognizable by the tan or gray color with darker stripes and the fact that the opening is on the left side of the shell. It is one of the only gastropods (shells in one piece) to have this unique, sinistral aperture feature.
The lightning whelk lives in shallow, sandy areas and prefers warm water. This makes Florida the perfect location to call home.
It may be easier to collect an empty lightning whelk shell while visiting the gulf coast area. This is because Sanibel Island, located on the west coast, is known as one of the best shelling places in the world. But the lightning whelk can also be found on the East Coast. You may have to travel away from the ocean seashore to find one. The inner waterway / rivers are where I’ve found it.
Pinkish lightning whelk
Broken Lightning Whelk Shell – Approx. 5 inches long
Living Lightning Whelk
Lightning Whelk snail
The Left-Handed Lightning Whelk
Live lightning whelk anchored in the sand
Lightning Whelk drawing
Found a big lightning whelk seashell in the river
I’ve come across lightning whelks on islands along the Intracoastal waterway. While boating and fishing, I usually get out and explore the muddy flats when the tide is low. This is an excellent time to find living sea life. Usually the shells are inhabited either by the mollusk or a hermit crab.
Live Lightning Whelk Snails
Below are a couple of photos of one such shell I found while walking the flats. This whelk had a pretty white top while the rest of the shell was more dark gray. I would have loved to collect it, but as you can see, the little guy who created that beautiful specimen was still using it as his home.
That yellowish hard piece is the operculum, or trapdoor, which shuts the snail inside the shell. It is made to fit perfectly within the aperture so no fleshy parts are exposed.
Living Lightning Whelk
I always bring my camera because most of the shells I find offshore while boating contain living creatures. I seldom find anything but worn, broken shells to bring home.
The Pear Whelk is a Similar Looking Shell
A similar looking shell that I also find is the pear whelk. It has a very similar shape, but it’s opening is on the right, like most gastropod shells. So far, every one I’ve found has been home to a hermit crab, but I always take photos.
All the shells below are not lighting whelks, but pear whelks. They do not get as large.
Lightning and Pear Whelks
This pear whelk could have been empty, but more likely a hermit crab was tucked down inside.
Little Yellow Pear Whelk Shell – Home to a Hermit Crab
Pear whelk seashell with hermit crab inside
The snail is beginning to come out of the shell
Although the lightning whelk can grow to be very large, there is one that is even larger. The Florida horse conch can have the lightning whelk for dinner!
So what is the difference between a whelk and a conch? I intend to answer that soon.
Help yourself to this free printout of a lightning whelk shell outline.
Aperture comparisons of the crown conch (L) and lightning whelk (R)
On a trip to Sanibel Island, on the Gulf coast of Florida, in 1991, we were able to find many lightning whelk shells. Most of them were inhabited by the mollusk and were easy to spot moving about on the sandy ocean bottom. I had no idea what I was collecting when I picked up the 4 inch long shell, but I knew it was a beauty and I felt lucky to have found it. I lived closer to the east coast of Florida where I’d never seen a shell so lovely. It was long and had beautiful streaks of brown running the length of it and the spiral on top was gorgeous.
I added it to my seashell collection and didn’t think too much about it.
I now know that it is a Florida Lightning Whelk and that it is known as being sinistral, or left-handed. When holding the shell at the pointed end, or bottom, you can see that the opening, or aperture, is on the left side. My photo to the right, shows my lightning whelk next to a crown conch to show what I mean. My reference book, the National Audubon Society’s Field Guide to Shells says that this shell can be up to 16 inches long.
It’s not difficult to find information and pictures on-line of this popular shell and if you are looking for more just google the name. If you get to visit any of the warm water beaches between North Carolina and Texas, you just might find a living lightning whelk.
Lightning whelks (Busycon contrarium) eat mostly bi-valves (shells with 2 halves) and especially love clams which they pry open using their strong “foot”.
A lady at Flickr has an interesting photo (below) of a lightning whelk egg case. If all of these babies had hatched, that would be a lot of new lightning whelks.
Please click this link to read what “biggertree” has to say about her photo below.
