I checked out Fort de Soto Park last weekend to see the changes wrought by Hurricane Idalia. While strolling the beach I found this yard-long burrow. Looking closely at the lumpy end, I noticed something cream-colored buried in the sand.
Ever curious, I gently dug down and uncovered this lumpy mass. In an attempt to determine heads or tails I gave it a quick rinse in the waves. I snapped photos of both sides before tucking it back into its burrow and continuing on my way.
A few steps later, a gelatinous blob drifting in the water caught my eye. I’ve spotted blobs like this before but never was able to identify them. After going down the sand worm/sea slug/gastropod rabbit hole, all I can definitively tell you is that my mystery photos are different stages of one species’ lifecycle.
Annoyingly, I cannot tell you which species. The closest I can determine is Sand Slug (Philine aperta), a predatory sea slug which looks very similar. It also produces translucent egg masses that it attaches to the sea bottom with a mucous thread. However, that species is only known in the eastern Atlantic Ocean.
So, I’m officially stumped…