The present study describes a new species, Ligophorus uruguayense, parasitizing the gills of Mugil platanus Günther, 1880 from the coast of Uruguay. It differs from all other species of the genus mainly in the shape of the ventral bar, the thick process at the distal end of the inner root of ventral anchors, the J-shaped penis accessory piece and the vaginal tube showing transverse annulations at its distal end, the host species, and geographical distribution. This is the first description of a species of Ligophorus from a mullet in the South Atlantic Ocean.
New records of the cubozoan jellyfish Tamoya haplonema in Uruguayan waters are reported together with historical records for the region, and associated with the oceanographic conditions at the moment of the finding. Occurrences of the species are mainly associated with positive Sea Surface Temperature Anomalies especially during summer months when the intrusion of warm oceanic waters to the Uruguayan coastline is stronger. This was particularly strong during 2012-2013, when a dry period enhanced this scenario. This species is the only cubozoan present in Uruguay, with a sporadic occurrence and so far has no appreciated negative effects on public health. However, from observed increasing frequency of positive temperature anomalies it would be reasonable to predict a future southward shift in the latitudinal distribution of T. haplonema. In this context, occurrence of this toxic species along Uruguayan coastal waters must be considered with particular attention to the potential negative impact on tourism and on general public health.
In this study, we reported the species composition and spatial distribution of Scyphomedusae and Cubomedusae from the southwestern Atlantic and Subantarctic region and reviewed the available knowledge of life history traits of these species. We gathered the literature records and presented new information collected from oceanographic and fishery surveys carried out between 1981 and 2017, encompassing an area of approximately 6,7 million km 2 (32-60°S, 34-70°W). We confirmed the occurrence of 15 scyphozoans and 1 cubozoan species previously reported in the region. Lychnorhiza lucerna and Chrysaora lactea were the most numerous species, reaching the highest abundances/biomasses during summer/autumn period. Desmonema gaudichaudi, Chrysaora plocamia, and Periphylla periphylla were frequently observed in low abundances, reaching high numbers only occasionally. Phacellophora camtschatica, Aurelia sp., Drymonema gorgo, Atolla chuni, Stygiomedusa gigantea and Pelagia cf. noctiluca were observed always in low numbers. Atolla wyvillei, Stomolophus meleagris, Desmonema comatum and Tamoya haplonema were reported just a few times and mostly individually. Although new species/reports can be found as surveys are undertaken, these results are considered to be the reliable baseline for further ecological studies seeking to understand the ecological role that these jellyfish play in marine ecosystems.
-The larvae of phyllobothriid cestode worms found in marine mammals have been classified as either "delphinii group" or "grimaldii group". The first group has been divided into 11 morphotypes by previous studies. However, these categories are vague and often overlap, as they were described from different host species within a wide geographical range. The goal of this study is to simplify the categorization of larval shape and size based on samples obtained from a single host species. Eleven Fraser's dolphin Lagenodelphis hosei Fraser, 1956 stranded on the coast of Uruguay in November 2001 and subsequently died. From these animals, 190 cysts of Phyllobothrium delphini (Bosc, 1802) were obtained from the perigenital blubber of one female and one male. The prevalence of P. delphini was 18.18%, density was 159.38 larvae/kg of perigenital blubber, mean intensity was 95 and mean abundance was 17.27. The following measurements were taken: total length (BL), width and thickness of cysts, neck length (NL), scolex length, scolex width, external diameter of the suckers, and the ratio BL/ NL. In order to facilitate further identification of these phyllobothriid cysts, they were grouped into three categories according to shape and size: category "A" (22.35%, neck always straight); category "B" (62.35%, all with curved neck); category "C" (15.30%, U-shaped or with projections from the wall of the cyst, also curved neck). These morphological differences could correlate to time spent in the host. One other larval form (Tetrabothrius sp.) was also found in the blubber of these dolphins.Resumen -Las larvas de filobotridios en mamíferos marinos fueron clasificadas como "grupo delphinii" y "grupo grimaldii". En estudios previos el primer grupo fue dividido en 11 morfotipos. Sin embargo, estas categorías son vagas y a menudo se solapan, ya que fueron descritas a partir de diferentes especies de hospedadores provenientes de una amplia distribución geográfica. El objetivo de este estudio es simplificar la categorización de tamaños y formas larvarias a partir de una muestra obtenida de un único hospedador. Se estudiaron once ejemplares muertos de Lagenodelphis hosei Fraser 1956 varados en la costa de Uruguay en noviembre de 2001. Ciento noventa quistes de Phyllobothrium delphini (Bosc, 1802) fueron obtenidas de la grasa perigenital de una hembra y un macho. La prevalencia de P. delphini fue del 18.18%, la densidad 159.38 larvas/kg de grasa perigenital, la intensidad media 95 y la abundancia media 17.27. Se tomaron las siguientes medidas: largo total (BL), ancho y grosor del quiste, largo del cuello (NL), largo del scolex, ancho del scolex, diámetro externo de las ventosas y el cociente BL/NL. Para facilitar futuras identificaciones, estas larvas filobotrídeas fueron agrupadas en tres categorías de acuerdo a su tamaño y forma: categoría "A" (22.35%, cuello siempre recto); categoría "B" (62.35%, todas con cuello curvado) y categoría "C" (15.30%, cuello curvado, quistes en forma de U o con proyecciones de la pared). Estas diferen...
Report of the Aglauropsis kawari jellyfish (Cnidaria, Hydrozoa, Limnomedusae) parasitated with the metacercaria of Monascus filiformis (Digenea, Fellodistomidae) in the estuary of the Rio de la Plata, Uruguay. The finding of Aglauropsis kawari in the estuary of the Río de la Plata is reported, expanding its geographical distribution to the coast of Maldonado Department, Uruguay. Also, a jellyfish parasitized by a metacercaria of Monascus filiformis was found, which constitutes a new host for this trematode.
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