Comment 6 for bug 874293

it appears to be a bug relate to libmtp9 (see http://www.debian-fr.org/absence-de-reconnaissance-sonde-spyder3-lsusb-t35369.html)

someone succeeded at making his Spider3 work by downgrading to libmtp8 (at the cost of having to uninstall amarok & vlc)
I'll let you know if that works for me as well.