Encrusting sponges, Zinzulusa cave (Il Cocito) photo by R. Onorato and N. Ciccarese

Encrusting sponges, Zinzulusa cave (Il Cocito) (magnification) photo by R. Onorato and N. Ciccarese

Encrusting sponges, Zinzulusa cave (Il Cocito) (magnification) photo by R. Onorato and N. Ciccarese