Dense little clubs

 

Pycnoclavella is one of my favorite tunicates (sea squirts).  This photo gives you a feel for how it grows in dense colonies.  (But remember, each one is only a few millimeters high!)

I first introduced this species ~6 years ago, so for more information, see the post called "The tiny tunicate, Pycnoclavella" on 17 February 2012.

P.S.   I think Pycnoclavella means "dense little clubs."  It's an appropriate name!