ACANTHOCOLLARITREMA-UMBILICATUM TRAVASSOS, FREITAS-AND-BUHRNHEIM, 1965 (DIGENEA, ACANTHOCOLLARITREMATIDAE) FROM THE COMMON SNOOK, CENTROPOMUS-UNDECIMALIS, FROM ITAMARACA, STATE OF PERNAMBUCO, BRAZIL

Acanthocollaritrema umbilicatum Travassos, Freitas and Buhrnheim, 1965 , is the only species of Acanthocollaritrematidae described up to the moment. The systematic position of this species and the validity of th e family has been questioned by the possible presence of a gonotyl and a genital atrium associated to the acetabulum. In this paper, specime ns of this trematode, collected from Centropomus undecimalis cultivate d at Itamaraca, State of Pernambuco, northeast Brazil were studied und er optical and scanning electron microscopy, and compared with availab le sintypes. Gonotyl and genital atrium were not observed and both fam ily and species are considered valid taxonomic entities. A. umbilicatu m is redescribed with the addition of new morphological information.