Melon sea Urchin, Echinus melo, is a species of sea urchin in the family Echinidae. This species grows up to 17 cm in diameter. It is spherical or slightly cone-shaped, and the colour of the test is mainly pinkish, yellowish, or greenish-yellow, and banded with white and pale brown, giving it a segmented appearance. The long primary spines are few in number and olive green with pale tips.

Finding a starfish is one of the first experiences a diver can have, especially the Red starfish - Echinaster sepositus - one of the many species among the most common in the Mediterranean Sea. It is one of the first encounters, but even the most experienced divers always find this species of echinoderm fascinating. However, when they meet, some precautions must be taken to avoid causing damage to these splendid starfish. Surely picking them up with some care, handling them and forcibly removing them from the substrate on which they are located can lead to damage ...

Simmetria in biologia è la distribuzione equilibrata di parti del corpo duplicati o forme all'interno del corpo di un organismo. In natura e biologia, la simmetria è sempre approssimata. La simmetria crea una classe di modelli in natura ...

Echinoderm is the common name given to any member of the philum Echinodermata  of  marine animals. ...

Echinoderm is the common name given to any member of the philum Echinodermata  of  marine animals. ...