sentences:  Velvet dogfish
  
  The velvet dogfish ("Zameus squamulosus") the only member of the genus Zameus, is a harmless sleeper shark of the family Somniosidae, found around the world between latitudes 64°N and 48°S, from the surface to 2,000 m. Its length is up to 84 cm.Although sharks within the family Somniosidae have generally been accepted to be non-luminous, "Zameus squamulosus" has photophores on its ventral epidermis.