Kalmar "Family Physidae" tana nufin dangin haraji na ƙananan katantanwa na ruwa, wanda aka fi sani da katantanwa na mafitsara, a cikin ajin Gastropoda. Waɗannan katantanwa sun yi tsayi, bawo mai siffar mazugi tare da ƙaramin buɗewa, kuma ana samun su a wuraren zama na ruwa mai daɗi a duniya. Sunan "Physidae" ya samo asali ne daga kalmar Helenanci "physis," ma'ana "bladder," wanda ke nufin kumburin katantanwa, gabobin numfashi kamar jaka.