Kalmar "dusky shark" yawanci tana nufin nau'in shark da aka sani da Carcharhinus obscurus. Wani katon shark ne mai launin toka mai launin toka wanda ke zaune a kogin bakin teku a duniya. Kalmar “dusky” a wannan mahallin tana nufin launin ruwan toka mai duhu ko launin ruwan kasa.
