What is "carapus"

Carapus is a genus of pearlfishes, with these currently recognized species:

• Carapus acus ( Brünnich, 1768) (pearlfish)
• Carapus bermudensis ( J. M. Jones, 1874) (Atlantic pearlfish)
• Carapus boraborensis ( Kaup, 1856) (pinhead pearlfish)
• Carapus dubius ( Putnam, 1874) (Pacific pearlfish)
• Carapus mourlani ( Petit, 1934) (star pearlfish)
• Carapus sluiteri ( M. C. W. Weber, 1905)