Hunting Peanut Worms in the Caribbean

Last month some of the Collin Lab members set out to the field at first light.  They were headed all the way across the country (a full hour’s drive!) to Galeta Marine Laboratory on the Caribbean coast of Panama.  This lab hosts research but is primarily used for outreach and education for kids in the city of Colon.  

Panamanian students learning about their 

environment from STRI Nature Guides.

With seagrass lagoons, mangroves and coral 

reef patches, Galeta is one of the most 

well-studied Caribbean sites in Panama.

The goal of the trip was to hunt for peanut worms.  They are the center of a biological controversy.  Are they regular segmented annelid worms that have lost their segments.  Or is the un-segmented body with a strange inverting proboscis unique and evolved independent of other worms?  We join Tupper Postdoctoral fellow Michael Boyle in a search of these peanut worms.

Intern Allan Carrillo searches for substrate

The worms are often found inside rock crevices and coral rubble or mud flats.  That’s why, we needed to collect rocks and coral rubble from shallow water (0.3-2 m).

We didn’t just see worms.  If course, we saw slugs and snails too.   The reef-flat is full of interesting invertebrates and seaweeds. 

But, most important, we found them!!! A bunch of specimens of Phascolosoma perlucens and Aspidosiphon sp. that with luck, will spawn.   If they do, Michael might use them as a model for his studies of evolution of development.

Michael carefully cracks open dead
coral heads to look for the worms.

And....after all that hard work... here he is!  

Phascolosoma perlucens!

Post prepared by:  Allan Carrillo