Join me in the cold, dark, life-sustaining NE Pacific Ocean to discover the great beauty, mystery and fragility hidden there.

“Exquisite Handiwork” – Sea Slug Eggs

“Some of nature’s most exquisite handiwork is on a miniature scale, as anyone knows who has applied a magnifying glass to a snowflake.

I was reminded of this Rachel Carson quote today when diving but found myself changing the ending to ” . . . as anyone knows who has seen sea slug egg masses.”

The image here is the egg mass of the Pacific Sea Lemon (Peltodoris nobilis), a sea slug up to 20+ cm; its egg mass up to some 20 cm as well.

The egg mass is the result of the Sea Lemons lining up right-side-to-right-side and both becoming fertilized. Being a hermaphrodite is of course a good design when you are a slow-moving slug that relies on smell to find its way.  More detailed information about sea slug mating can be found at this previous TMD blog entry.

Looking like rich, textured crocheting, the egg mass is indeed Nature’s exquisite handiwork.  Its intricacy rivals that of any spider’s web and, in my perception, surpasses any human nanotechnology.

Seeing such beauty serves as testimony of Nature’s perfection and complexity. How we humans are newcomers to it all, unable to truly grasp the billions of years of design that proceeded our walking upright on earth. It should further motivate us all to walk with much smaller footprints so that we do not blunder and crush the systems that are Nature’s exquisite handiwork.

Follow the link below for images showing a close-up on the egg mass allowing you to see the individual eggs; the mating of the Pacific Sea Lemons; the egg laying and predation by a leather star. Click here.

Note: The Sea Lemon is often mistaken for other dorid species such as the Monterey Dorid.  The easiest way to ID them correctly is to know that Pacific Sea Lemons have white gills. Those of the Monterey Dorid are yellow. 

5 Responses to ““Exquisite Handiwork” – Sea Slug Eggs”

  1. Ang

    I’m always amazed at your blogs; the caring, the wonder, and the time you put into it. Such great work Jackie!!! Thank you.

  2. ev

    they really are like little doilies aren’t they? I had no idea. If they are hermaphrodite then why are they mating? (that sounds sarcastic and isn’t meant to be) How many eggs are in each cluster approximately? And do they lay more than one each season? I wondered how many actually survive to become adult.
    sorry for the many questions but they really pique my interest.

    • jackiehildering

      Thrilled to peak your interest and will address all questions a little later. Nature still favours genes mixing. Hermaphrodites don’t inseminate themselves. They can inseminate and be fertilized. Massive hug to you Ev. So appreciate the interest!

    • jackiehildering

      Hello again Ev, Having done a quick count on a segment of a close-up of the eggs and then using this to form an estimate, I would say that the egg mass has about 35,000 eggs. Also of interest may be that they are called “sea lemons” as apparently they give off a mild, lemon-like scent.


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