On rocky shores, macroalgae play an ecological role as organizer of community structures, since they are source of food for many invertebrate species inhabiting their fronds, as well as providing shelter from predators, enhancing environment conditions and reducing water movement. With this in mind, detecting new species on a regional scale is of major importance for biodiversity monitoring and conservation. In the current study, a first record of the seaweed species Acetabularia myriospora was made in the offshore of Ceará state, Brazil. The frequency of occurrence of A. myriospora (1.62%) is considered low whether compared to that of A. calyculus (17.43%). This study is the first record of the species Acetabularia myriospora (Polyphysaceae, Chlorophyta) in the coastline of Ceará state.
Considering that the quantitative and ecological studies related to parasites of scombrids are scarce in Brazil and that in Rio Grande do Norte (RN) there are no records, specially of Trematoda in Euthynnus alletteratus, this work reports the presence of the digenean Lobatozoum multisacculatum as well as their ecological parasitic indexes in this host species.
Keywords: geographic distribution, Didymozoids, Trematoda in scombrids, little tunny.
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