Kalmar "Family Pocidae" tana nufin dangin haraji na dabbobi masu shayarwa na ruwa waɗanda aka fi sani da "hatimin gaskiya" ko "hatimin kunne". Suna daga cikin odar Carnivora kuma ana siffanta su da rashin fitilun kunnuwansu na waje da gajerun filayen su na gaba wanda suke amfani da su don tura kansu ta ruwa. Iyalin Pocidae sun haɗa da nau'ikan hatimi fiye da 20, gami da hatimin tashar jiragen ruwa, hatimin giwa, da hatimin damisa.