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Lightning Whelk
Sinistrofulgur sinistrum · Size: Up to about a foot long
The lightning whelk is one of the most recognizable shells on the Gulf coast, and it is the one that surprises people because it opens on the left side instead of the right. Its long, pointed shape and zigzag brown streaks on the whorls give it the name.
How to identify it
Hold the shell with the pointed tip up and the opening facing you. If the opening is on your left, it is a lightning whelk. Fresh shells have dark streaks that fade to cream or white as they weather.
Where to look near Sarasota
Washes up on Gulf beaches all around Sarasota and Manatee counties, especially after winter fronts. Whole shells are common on the shell line; broken ones are everywhere. Also look for the long string of papery discs, which are its egg cases and are not a shell.
More shells to look for
Finding lightning whelks with a guide
Lightning whelks are a regular find on our night tours. In the shallows the light pod picks up the pale shell against the sand, and because the water is only a few feet deep you can reach down and check whether it is empty before it goes in your bag.
Fun Florida Tours runs a guided night shelling and snorkeling tour in shallow Gulf water at Siesta Key, Sarasota and Anna Maria Island. You wade in from shore with a guide, the group shares one bright LED light pod that lights up the bottom, and the water stays under 4 feet deep, so you do not need to be a strong swimmer. After 60 minutes in the water we spend 15 minutes on the sand for show-and-tell, where guides name everything the group found. Empty shells are yours to keep; anything alive goes back.