It's a sea pen.

-----Original Message-----
From: flmnh-aspidolist [mailto:[log in to unmask]] On Behalf Of Solis Marin Francisco Alonso
Sent: Wednesday, October 17, 2012 12:16 PM
To: [log in to unmask]
Subject: What is this?!!

Dear friends...
I am sorry to distract you with a NON Holothurian question...
A friend of mine found this animals in the Mexican Caribbean (shallow water) do you have any guess? they look like Cnidarians?

Cheers,

Francisco


Dr. Francisco A. Solís-Marín
Jefe de la Unidad Académica Ecología y Biodiversidad Acuática.
Colección Nacional de Equinodermos
"Dra. Ma. E. Caso Muñoz"
Instituto de Ciencias del Mar y Limnología Universidad Nacional Autónoma de México Circuito Universitario s/n Deleg. Coyoacán Mexico, D,F., CP. 04510 Tel. (52) 56-22-58-43