Hydroid colony

Hydroid colony

Observation - Hydroid colony - UK and Ireland. Description: Picture 1 shows a small area of the Sea Mat Electra pilosa - the cells (in which the tiny animal lives - a few can be seen) are about 0.5mm x 0.3mm. The spiral shell of the Spirobis spirorbis worm is about 1.6mm across and, the subject of this post, the m

Picture 1 shows a small area of the Sea Mat Electra pilosa - the cells (in which the tiny animal lives - a few can be seen) are about 0.5mm x 0.3mm. The spiral shell of the Spirobis spirorbis worm is about 1.6mm across and, the subject of this post, the massive, greenish Hydroid Dynamena pumila fills the lower part of the picture
What we see are empy hydrotheca (sort of cups), as I believe the animals themselves have left their homes. These then are the protective cases built in a stalked and tiered colony. Their shape and structure are usually used to identify the animal itself (as I understand it).
The scale in this case is - each little segment represents 0.05mm, each numbered segment 0.5mm and the whole 1-10 field is 5mm.
This http://www.aphotomarine.com/hydrozoa_sea_fir_dynamena_pumila.html shows a large colony
See comments below.
CORE EDIT
This post is now linked with http://www.ispotnature.org/node/378904