Paracetonurus flagellicauda has a slender body, tapering to a string-like tail (hence its specific name flagellicauda, "whip-tail"). It is white with black markings.[7] Its length is maximum 39.3 cm (15.5 in).[2]
^Denmark), Jorgen Nielsen (Natural History Museum of; Paul Fernandes (School of Biological Sciences, Zoology Building; Lorance (IFREMER), Pascal; Research), Kjell Nedreaas (Institute of Marine; Strathclyde), Robin Cook (MASTS Marine Population Modelling Group Department of Mathematics and Statistics University of; Ann-Britt Florin (Institute Of Coastal Research, Department of Aquatic Resources; Assessment), Manuel Conceicao Biscoito (IUCN SSC Shark Specialist Group / Município do Funchal / IUCN European Marine Fish (January 24, 2015). "IUCN Red List of Threatened Species: Paracetonurus flagellicauda". IUCN Red List of Threatened Species.