I found several hand-size shells on a Baja beach last winter, and learned they’re called pen shells. I would have named the translucent beauties fan shells, since they look like fluted fans decorated ...

ATHENS, Greece (AP) — A fan mussel found only in the Mediterranean was officially added to the list of critically endangered species, after scientists recorded a dramatic decline in its population ...

The Noble Pen Shell, part of the Pinnidae family, is found in the Mediterranean Sea and is the largest of all pen shells, reaching up to 4 feet in size. This shell is known for its beautiful copper ...

A huge decline in the number of noble pen shells, an endangered species of Mediterranean clam, is happening in Croatia’s south, as scientists warn that the parasite causing the problem is spreading ...

The giant pen shell, or pinna nobilis, is found only in the Mediterranean Sea. But in 2016, a mass die-off occurred that nearly made them extinct. Now, some surviving specimens have been found off the ...