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Wednesday, June 18, 2014

Mysterious green mass

An interesting and mysterious green egg mass in the low intertidal zone along the rocky shore of Bodega Head:


Here's a closeup view (below):


We weren't certain what type of egg mass this was, i.e., what type of animal had produced it.  A worm?  A snail?  So we brought a tiny piece back to the lab for a look under the microscope.  Here's the first view:


Tbe egg mass was packed with developing larvae!  Can you tell what they are?

A couple of the larvae (veligers) had hatched and were crawling on the outside of the egg mass:


Now you can see that this is a tiny gastropod.  The shell is very tall.  Two black eyespots are visible.


The next image shows a nice view from the side:

 
We're not sure which species of gastropod this is, but we'll be asking for ideas.  If you know, let us know!      

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