 Chitinous ( composed of chitin ) love darts occur in the pulmonate land snail families Ariophantidae ( superfamily Helicarionoidea ) , in the family Helicarionidae ( superfamily Helicarionoidea ) , in the Vitrinidae ( superfamily Limacoidea ) , and in the slug family Parmacellidae ( superfamily Parmacelloidea ) . 
