Ultrastructure of Intracytoplasmic Rickettsia-Like Infection of the Gills of the Teleost Archosargus Probatocephalus (Sparidae) in Northeastern Brazil [Ultraestrutura de Rickettsia Intracitoplasmática Infectando as Brânquias do Teleósteo Archosargus Probatocephalus (Sparidae) No Nordeste do Brasil]