Colour variants – Temnopleurus alexandri urch…

Colour variants - Temnopleurus alexandri urchin #marineexplorer

Colour variants – Temnopleurus alexandri urchin #marineexplorer by John Turnbull

Via Flickr:

While some urchins are just plain ol’ black, others have a range of colour variants. Heliocidaris erythrogramma – purple urchins – can be anything but purple, and Tripneustes gratilla – sea lamingtons – can have rainbow icing and coconut flecks. Until now, I thought all T. alexamdri had purple spines… but in this pic from Steel Point, Sydney Harbour you can see the less common orange version.