Knifetooth dogfish - Scymnodon ringens Family SQUALIDAE - Dogfish sharks Scymnodon ringens ADW: Squalidae: Classification
Scymnodon macracanthus. Species Scymnodon obscurus (smallmouth velvet dogfish).
http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind0201&L=shark-l&F=&S=&P=8507

SHARK-L archives -- January 2002 (#81)
...dogfish Squaliformes Squalidae Scymnodon Scymnodon obscurus Smallmouth velvet dogfish
http://raven.utc.edu/cgi-bin/WA.EXE?A2=ind0402&L=shark-l&F=&S=&P=272

Scymnodon ringens Historic NMFS Catalog of Images
580. figb0580, Plate IV. 12. Scymnodon ringens, Bocage and Capello. Drawings from
http://www.photolib.noaa.gov/historic/nmfs/figb0580.htm

NOAA Photo Library/Historic NMFS Collection/Fish/figb0580
Back to album. Plate IV. 12. Scymnodon ringens, Bocage and Capello. Drawings from
http://www.itis.usda.gov/servlet/SingleRpt/RefRpt?search_type=publication&search_id=pub_id&search_id_value=712

ITIS 'Publication' Search results for Compagno, Leonard JV
Scymnodon ringens Barbosa du Bocage and Brito Capello, 1864 -- valid -- knifetooth
http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=160755