dejayM's picture

Lobed Bryozoan

Observed: 29th September 2013 By: dejayM
Biological Recording In ScotlandHighland Biological Recording GroupOrkney Biodiversity Records Centre
dejayM’s reputation in InvertebratesdejayM’s reputation in InvertebratesdejayM’s reputation in InvertebratesdejayM’s reputation in Invertebrates
size
form
close
hydroid
bryozoan cells
lengthy 'strands'
Description:

Undoubtably sponge-like; structurally and texturally just what we might expect. But there is little web-evidence (less in the books) for it encrusting algal fronds, as in my previous observation http://www.ispot.org.uk/node/366005 and Jo's, still unresolved, one here http://www.ispot.org.uk/node/369738
But there is some reasonable evidence here -
http://www.european-marine-life.org/02/amphilectus-fucorum.php
Whilst investigating its structure, via my newly acquired binoscope, I discovered 'hydroids' and Aufwuchs (see http://www.ispot.org.uk/node/371188).
So, a couple of pictures of interest to the precious few marine invertebrate watchers. In due course I will (try to) separate out the true hydroids from the apparent bryozoan cells (sea mat?) and the wonderfully named Aufwuchs.
The Sponge-like encrustation is the subject of this post!
New EDIT - added a Tag

Identifications
Species interactions

No interactions present.

Comments

trudy-russell's picture

love the binoscope photos!

love the binoscope photos! The second one is a bryozoan you can clearly see the feeding tentacles (lopophore) it is electra pilosa the frosty sea mat. The first bino photo is a hydroid sticking out in front of the tentacles you can see a round lump (the hypostome) or mouth which is not present in the bryozoans. and below the tentacles is a clear void in the body this is likely to be the theca a cup into which the tentacles can disappear if threatened.

No real help with the sponge but I will have a look, p.s have you checked out http://www.habitas.org.uk/marinelife/sponge_guide/sponge5.pdf the best sponge guide I know of and freely available!

Trudy Russell
Marine Advisor
Natural England

To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409

dejayM's picture

so much to learn

Thanks Trudy - it is a REAL delight to get such comments.
I have a few of the Frosty Mat and I just loved watching them popping out and back. It has made me realise how alive the sea is. Through the low power microscope there were dozens of the tiniest things dashing 'round, as well the smallest transparent snails possible quietly grazing!
I have yet to master photographs (I will) - placing the pocket camera on the eyepiece at the mo. Graticule comes soon!
Hydroids, yes. Such mysteries - if only they were easier to separate - I will, I will!
the Benard Picton MCS Key to Sponges is a delight - I have it by my bed. How sad eh?

dejayM's picture

..a shift of Likelihood..

Wandering through my resource, I relocated the picture on P25 of Collins COMPLETE. P3 fits really well with Dave Fenwick's http://www.aphotomarine.com/bryozoan_alcyonidium_hirsutum.html.
I'm happier, MUCH happier.
The link in the new ID appears broken
http://www.ispot.org.uk/node/343947

trudy-russell's picture

I hadn't noticed the main

I hadn't noticed the main subject was bryozoan rather than sponge, and just when I thought I was getting there!

Trudy Russell
Marine Advisor
Natural England

To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409

dejayM's picture

close

Well you were right - I changed the post title!
I am now convinced of this but if you got close to a sponge, say!
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