There are 2 metal bands with this name: A greek (Progressive Death Metal) and a portuguese (Thrascore/Melodeath Metal) one. 1) Greek one:
They were formed in 2004 in Thessaloniki, Greece. The line-up consists of G. Chionidis (drums), N. Parastatidis (guitars), P. Bouklis (guitars), T. Deligiannidis (vocals) and A. Roditis (bass). They have released a demo in 2006 entitled This Suffering. Zero Tolerance (UK) magazine awarded them the Demo of the Issue (September/October 2006) and Metal Hammer (GR) magazine awarded them the Demo of the Month (July 2007).

Read more about Echidna on Last.fm.