Collections of Amblyomma auricularium (Conil 1878) and A. pseudoconcolor Aragão, 1908 are discussed in relation to distribution and hosts. Three tick collections (two from Argentina and a third from the USA) house a total of 574 A. auricularium (307 males, 162 females, 73 nymphs and 32 larvae) and 179 A. pseudoconcolor (96 males, 74 females, 4 nymphs and 5 larvae). Apart from an adult A. pseudoconcolor found on a bird, Nothura maculosa Temminck, 1815, all ticks were found on mammals. The great majority of specimens of both ticks species were removed from the family Dasypodidae Gray, 1821 (84.9% and 93.8% of A. auricularium and A. pseudoconcolor, respectively). Amblyomma auricularium has also been found on wild hosts of the families Myrmecophagidae and occasionally Didelphidae, Caviidae, Chinchillidae, Hydrochaeridae, Muridae, Canidae, Mustelidae, Procyonidae and domestic animals (cattle, dogs, horses), while A. pseudoconcolor has also been found occasionally on wild hosts of the family Didelphidae and on domestic animals (cattle, dogs). Amblyomma pseudoconcolor appears to be restricted to the Neotropical region, covering northern Argentina and the eastern region of South America from Uruguay to Surinam, including south-eastern Paraguay, eastern Brazil and French Guiana. Amblyomma auricularium is distributed from northern Patagonia in Argentina throughout the Neotropics into the Nearctic region up to the southern USA (Texas, Florida), with collection localities also in Belize, Bolivia, Brazil, Colombia, Costa Rica, French Guiana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Trinidad & Tobago, Uruguay and Venezuela. It is not known whether A. auricularium is an established resident of the USA.

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The occurrence of the doctorfish Acanthurus chirurgus is reported for the first time in the Mediterranean Sea, off Elba Island, Tyrrhenian Sea (42.726667° N, 10.434444° E). This record is tentatively related to aquarium release. The occurrence of Acanthuridae in the Mediterranean Sea is briefly reviewed, and some distributional notes on Acanthurus coeruleus and Acanthurus monroviae in the Mediterranean are provided.

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Posidonia oceanica is of particular interest in environmental studies for its ecological and economical importance in Mediterranean coastal environments. The plant is a source of direct and indirect food for marine organisms and it contributes greatly to increase the content of oxygen in the water. Grasslands of Posidonia oceanica represent a biological indicator of pollution and of the physio-chemical status of the marine environment.This paper, after recalling the main characteristics of Posidonia oceanica, discussing of its importance in the marine ecosystem, and quickly summarizing the methodology to study grasslands' evolution, propose a new methodology for collecting data by means of advances underwater technologies (acoustic localization systems, diver propulsion vehicles and photo cameras). In particular, new tools for analysis and mapping the growth areas and their physio-chemical and morphological characteristics and for construction of augmented maps for GIS using open tools like Google Earth are presented. Preliminary results concerning the population of Posidonia oceanica in the Tremiti marine sanctuary, Italy, where it colonizes large areas, are described.