Published in Zoological Science, in 1991, in volume 8, pages 991-997

Created: 2012-09-19, modified: 2012-09-19

Published in Zoological Science, in 1993, in volume 10, pages 819-826

Created: 2012-09-19, modified: 2012-09-19

Published in Nautilus, in 2011, in volume 125, issue 4, pages 207-212

Created: 2016-04-24, modified: 2016-04-24

Published in Paleontological Research, in 1999, in volume 3, pages 81-87

Created: 2013-02-27, modified: 2013-02-27