merisiili englanniksi   sea urchin


*: Of the many species of sea urchins utilized in biological research today the most widely used in North America is probably the purple sea urchin, Strongylocentrotus purpuratus.

*: The pericentriolar radial complex characteristic of the spermatozoa of other echinoderms is lacking in the spermatozoa of all sea urchins.

*: Approximately 20% of sea urchins are direct-developers, meaning that they bypass the pluteal larval stage and develop directly into an adult sea urchin.

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synkkä neuvo miten vain varikkopysähdys pilaantunut rannikkolaivurin radiotodistus