In particular, do these ever have the character of an attachment disc, say, with concentric ornamentation?
Dear Dr. Mark
Many squids lay sausage-like bunches of eggs. I am not sure if anyone have studied the ornamentation of cephalopod's egg-cases.
Best
Dola
Most squids produce a large number of eggs encapsulated in a gelatinous matrix or a large number of such structures that are attached together.The egg mass of an oceanic squid can be a large, fragile gelatinous ball or tube carrying many thousands of eggs. In contrast, the egg mass of a neritic squid (loliginid) can be composed of very tough capsules each carrying several hundred eggs with many capsules attached together at their bases and to the substrate to form an egg mass.
a spawning female squid attaches each case (or sausage) to something firm, like a rock in the sand, or to other egg cases. When other females use the same attachment point, a flared-out “egg-mop” or mass is created. Many such egg-mops may be clustered in areas providing good attachment points
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