Macvicaria crassigula (Linton, 1910) (Opecoelidae) is referred from the intestine of Micropogonias furnieri and from Stellifer rastrifer; and from Stellifer rastrifer, and Saturnius maurepasi Overstreet, 1977 (Bunocotylidae) from the stomach of Mugil liza. This is the first report of these species in Brazil, and a new host records are presented
Dinosoma clupeola sp. n. is described from Harengula clupeola, and resembles D. hawaiiense Yamaguti, 1970, from which it differs in the entire, elongate-saccular seminal vesicle, tegument weakly plicated, smaller size of body and internal organs, and slightly larger and narrower eggs. Pseudoacanthostomum floridensis Nahhas & Short, 1965 is referred to Netuma barba, which represents a new host record. Dinosoma clupeola sp. n. é descrito de Harengula clupeola, e assemelha-se a D. hawaiiense Yamaguti, 1970, da qual difere pela vesícula seminal que é inteira, sacular alongada, e não signóide e torcida em duas ou três porções, pelo tegumento que é fracamente plicado, e não liso, pelo meneor tamanho do corpo e dos órgãos internos e pelos ovos que são ligeiramente maiores e mais estreitos. Pseudoacanthostomum floridensis Nahhas & Shsort, 1965 é referido em um novo hospedeiro: Netuma barba
Schikhobalotrema solitaria sp. n. is described from Stephanolepis hispidus (Linnaeus, 1758), and is characterized by the relation between oral sucker and pharynx 1:1,1. This Relation in the other species ranges between 1:0.3-0.6. It is more similar to S. manteri Siddiqi & Cable, 1960 in the distribution of vitellaria, differing from it in the size of vitelline follicles, extension of uterus and in the size of the eggs. S. acanthuri Yamaguti, 1970 is referred for the first time in South America in Mugil liza Valenciennes, 1836 representing a new host record
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