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Crocheted Sea Urchin December 8, 2007

Posted by barn owl in coral reefs, crochet, echinoderms.
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sea urchin

Embryos of the sea urchin S. purpuratus have been used in classical developmental biology experiments, and continue to serve as an excellent system for addressing evolutionary and molecular developmental biology questions. I crocheted the sea urchin above from inexpensive variegated acrylic yarn, to provide the stiffness necessary for the “test”. I added beads, in the characteristic 5-fold radial symmetry, as well as yarn spines. The urchin was a prize for the top-scoring student in one of the classes I teach.

Background is a tote bag crocheted from plastic bag yarn.

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Sea Lemon August 5, 2007

Posted by barn owl in coral reefs, crochet, molluscs.
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Sea lemons are dorid nudibranchs which may sport colored projections, or tubercles, on the mantle. I’ve encountered the Pacific or speckled sea lemon (Anisodoris nobilis) in tidepools along the Oregon coast, and there is also a Monterey Bay sea lemon (Archidoris monteryensis). The dorid nudibranchs are named for the Oceanid Doris, daughter of Oceanus and Tethys.

Pacific sea lemon, crocheted from golden acrylic yarn and fuzzy pale yellow baby yarn, with wooden beads to represent the tubercles. Photographed with the coral sea lettuce, crocheted using hyperbolic method, from variegated acrylic yarn:

Pacific Sea Lemon