| [species, dynamics and population composition of phthirapteran in free-range chickens (gallus gallus l.) in são luis island, state of maranhão]. | the objective of this work was to identify the phthirapteran species, to determine the prevalence according to the anatomical region of the body and to know the dynamics and composition of the population of these ectoparasites in free-range chicken in são luis island, state of maranhão. inspection was performed in 40 chickens and feathers were collected from the head, neck, wing, thigh, dorsal and ventral regions and cloacae. the phthirapteran species identified were: menopon gallinae l., menaca ... | 2008 | 18641896 |