| acanthocollaritrema umbilicatum travassos, freitas & bührnheim, 1965 (digenea: acanthocollaritrematidae) from the common snook, centropomus undecimalis, from itamaracá, state of pernambuco, brazil. | acanthocollaritrema umbilicatum travassos, freitas and bührnheim, 1965, is the only species of acanthocollaritrematidae described up to the moment. the systematic position of this species and the validity of the family has been questioned by the possible presence of a gonotyl and a genital atrium associated to the acetabulum. in this paper, specimens of this trematode, collected from centropomus undecimalis cultivated at itamaracá, state of pernambuco, northeast brazil, were studied under optica ... | 2006 | 9698863 |