Assertion: echinoderm's skin | /r/HasProperty | phormosoma species
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text: Some short-spined urchins have spines tipped with balloonlike venom sacs that are capable of delivering a severe sting without inflicting a penetrating wound (Asthenosoma species, Araeosoma species), while others envenom in a fashion similar to long-spined urchins, releasing venom into the wound when the spine penetrates the skin (Phormosoma species).