Mystery urchin structure

Mystery urchin structure

Observation - Mystery urchin structure. Description: About 0.5mm long (not including threads), fairly numerous and attached to spines of the sea urchin Psammechinus miliaris. After initially having no idea what it was (I thought it was a separate organism), it turns out to be one of the pedicellariae of P.

About 0.5mm long (not including threads), fairly numerous and attached to spines of the sea urchin Psammechinus miliaris. After initially having no idea what it was (I thought it was a separate organism), it turns out to be one of the pedicellariae of P. miliaris.