Protecting and Restoring the Morro Bay Estuary.
sea slug of the month

The Perfect Social Distancing Activity: Early Morning Tidepooling for Nudibranchs in San Luis Obispo County

A Limacia cockerelli nudibranch from the front. It is white with orange-tipped cerata.

    Now through October is the peak of the nudibranch-viewing season. Wait, what? You didn’t know there was a season for looking at nudibranchs? Well, there is, at least for some of the flashiest species found in the tidepools of the Central Coast. Scuba divers have a bit more time and options, but for those of us who look for nudibranchs with our heads above water, the early morning hours of late summer offer us some of the best opportunities to see these colorful marine gastropods in the intertidal. In previous blogs for the Estuary Program, I’ve gone into …

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Rare Nudibranch! Two Citizen Scientists find Cerberilla pungoarena in the Morro Bay Estuary

Cerberilla pungoarena in Morro Bay. Copyright passiflora4, Laura Schachterle and Thomas Hintz.

    Cerberilla pungoarena (Collier & Farmer, 1964) is one of those rare nudibranchs you may never see: only a few subtidal specimens have been reported since the mid-2000s. But now, fifteen years later and further north than they have ever been seen before, a single specimen of C. pungoarena was spotted and photographed a few months ago in shallow water in the Morro Bay Estuary by two intrepid nudibranch enthusiasts, Laura Schachterle and Thomas Hintz.  Nudibranchs are shell-less marine molluscs commonly called sea slugs. There are over 130 species of nudibranchs found in California, many brightly-colored. “Great find and …

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Sea Slug of the Month – Yellow Blobs of Awesomeness, Guest Post by Robin Agarwal

    Yellow Blobs of Awesomeness: Sea Goddesses, Sea Lemons and That One with the Tentacles Guest post by Robin Agarwal   Humans like sea slugs. They’re harmless to humans, but voracious predators if you’re a hydroid or a sponge. They come in a variety of cool shapes and sizes, and have fascinating life histories that allow one to throw around words like ‘nudi’ and ‘hermaphrodite’ with impunity in mixed company. But best of all, nudibranchs appeal mightily to humans’ attraction to pattern and color. We cannot resist taking a closer look at something bright and colorful as we explore …

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Sea Slug of the Month – Morro Bay’s ‘Gateway Nudi:’ Opalescent Nudibranch, Guest Post by Robin Agarwal

Three Opalescent Nudibranchs (Hermissenda opalescens). Photograph courtesy of Robin Agarwal via Flickr Creative Commons License

    “Whoaaaa…what is THAT?” “It’s gorgeous, whatever it is.” “It’s moving!” “Dude, check this out!” “So BLUE!” “What IS it?” Music to a science educator’s ears, of course, thanks to the astonishing colors and reasonably viewable size of one of California’s most iconic sea slug species, the Opalescent Nudibranch (Hermissenda opalescens). Found throughout the Central California coast, these brightly-colored carnivores are often the first nudibranchs to astonish and delight the humans venturing into their intertidal world during seasonal low tides. Photograph of Opalescent nudibranch, (Hermissenda opalescens) taken in Monterey, California. Courtesy of Robin Agarwal, under Creative Commons license via …

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