agc: minor additions 11/07/94

rpg: new formatting 3/28/95

bmw: minor revisions 08/17/95

jrh: major revisions 10/27/95, 1/29/96

jrh and brs: new images, cladogram, ecology page, and restructure into five-page format 11/24/97 to 12/15/97

Dave Smith: Minor page design changes, cladogram change (graying out groups with no links), replacing ISMAPs with USEMAPs 7/19/05

Dave Smith: Application of UCMP style sheet, addition of footer includes, new cladogram 7/27/05