Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2012 Apr 27;7(4):e35105. doi: 10.1371/journal.pone.0035105

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Van Soest et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

PMC Copyright notice

A. Clathrina rubra (Calcinea, Clathrinida), NW Mediterranean Sea (photo courtesy Jean Vacelet); B. Calcinean spicules: equiangular and equiradiate triactines (photo courtesy Jean Vacelet); C. Guancha lacunosa (Calcinea, Clathrinida), NW Mediterranean Sea; D. Petrobiona massiliana (Calcaronea, Lithonida), two specimens from caves, NW Mediterranean Sea. Spicule complement of P. massiliana: from left to right pugiole, sagittal triactines, microdiactine (photos courtesy Jean Vacelet); E. Calcaronean spicules: sagittal (inequiangular) triactines and diactines; F. Syconoid aquiferous system from Sycon ciliatum (SEM photo, courtesy Louis De Vos, ULB); G. Sycon ciliatum (Calcaronea, Leucosolenida), specimen about 10 cm, from the English Channel.