RESUMEN
Prochilodus lineatus has been considered an ecosystem engineer in the Neotropics given its influence on important ecosystem processes, and it is therefore relevant to understand their inter-specific relationships. The association of P. lineatus with parasitic helminths was studied in two isolated shallow lakes of the alluvial plain of the Middle Paraná River. Only two species of gastrointestinal nematodes were found: Spinitectus asperus (Cystidicolidae) and Klossinemella iheringi (Atractidae), with S. asperus having higher prevalence and mean intensity values. This is the first record of K. iheringi in the Middle Paraná River, Argentina, as well as the southernmost citation of S. asperus.
Asunto(s)
Characiformes , Nematodos , Animales , Argentina , Ecosistema , Peces/parasitología , RíosRESUMEN
PURPOSE: To report a new species: Sprentascaris pampayensis, a Raphidascarididae parasite from the Neotropical region. METHODS: During a parasitological survey, specimens were collected of a new species of Sprentascaris from Hypostomus commersoni Valenciennes from urban lakes in Santa Fe City, Santa Fe Province, in the Pampean region of Argentina. Morphological and morphometric descriptions, and molecular analyses were performed. RESULTS: The new species, S. pampayensis n. sp., is characterized by having slightly extended lateral wings in both sexes, oral structure with three well-developed lips with double papillae, ventrolateral lips with an amphidial pore. Triangular buccal opening with three well-developed lips with flattened extensions at their bases, which end in a pointed manner towards the back. Males have 17 pairs of preanal papillae, 1 pair of adanal papillae, 3 pairs of postanal papillae and 1odd median postanal papilla located between the first and second pairs, unusual shape of caudal papillae with the central tubular part conspicuously elevated. Females have pre-equatorial vulva, smooth-shelled eggs, and mature embryonated eggs. DISCUSSION: Sprentascaris pampayensis n. sp. differs morphologically and genetically from S. manherti Petter and Cassone, 1984, S. lanfrediae Melo, Santos, Giese, Santos and Santos, 2011 and S. andersoni Malta, Paiva, Elisei, Tavares and Pereira, 2018. Morphological and morphometric comparison also distinguishes it from S. pimelodi Petter and Cassone, 1984, S. hypostomi Petter and Cassone, 1984, S. marano Ramallo, 2009, and S. saltaensis Ailán-Choke, Ramallo and Davies, 2017. Sprentascaris pampayensis n. sp. is a new parasitic nematode of Hypostomus commersoni.
Asunto(s)
Ascaridoidea , Bagres , Nematodos , Animales , Femenino , Masculino , Argentina , Ascaridoidea/genética , Nematodos/anatomía & histologíaRESUMEN
A partir de la obra de Lacan, y estableciendo que el análisis no es solo cuestión de escucha sino también de lectura, se analiza de qué manera influye en la orientación de la práctica psicoanalítica.
Asunto(s)
Psicoanálisis/instrumentación , Psicoanálisis/tendencias , Teoría Psicoanalítica , EscrituraRESUMEN
Las escuelas, y parques donde existen lugares con arena pueden constituir un camino importante en la transmisión de varias zoonosis parasitarias, representando un riesgo potencial, principalmente para los niños en edad de la escuela que juegan en estos lugares. Entre varias zoonosis, larva migrans visceral (LMV), es una patología caracterizada por la migración de larvas de Toxocara spp. A través de los tejidos del ser humano originando reacciones del topi imunoalergénico. El objetivo de nuestro trabajo fue determinar la presencia de huevos de parásitos en las muestras de arenas de plazas públicas de la ciudad de Concordia. Se trabajó con 12 muestras de arena colectadas de diferentes plazas infantiles de Concordia, de los barrios: Centro, Nazare, Vista Alegre e Industriarios. Una muestra de aproximadamente 500 gramos de 4 lugares diferentes de una misma plaza fueron colocadas en frascos plásticos, siendo luego analizadas mediante el examen de sedimentación espontánea, propuesta por Lutz. Los resultados indicaron un 28 por ciento (7/25) de muestras positivas a T. canis lo que significa que los suelos de las plazas públicas de la ciudad de Concordia están muy contaminados con huevos de este parásito del perro. Por consiguiente, este estudio señala que debe lograrse un control al acceso de estos animales en los lugares públicos con el propósito de prevenir patologías que pueden afectar principalmente, a niños y sobre todo, en este caso, a la infección por T. canis.
Schools, squares andparks where sand is present can constitute an important transmission form for several parasitic zoonosis, representing a potential risk, mainly for children in school age that play at these places. Among the several zoonosis, visceral larva migrans (VLM), is an important pathology characterized by the migration of the larval stages of Toxocara spp. to human tissues originating imunoalergic type of reactions. The objective of our work was to determine the occurrence of parasites eggs in samples of sands from public squares ofConcordia city. This work was accomplished with 12 samples of sand collected at different squares of Concordia: Centro, Nazare, Vista Alegre and Industriarlos. 500 g. samples of 4 different places of the same square were collected in plastic flasks and then analyzed by the spontaneous sedimentation exam, proposed by Lutz. A 28 percent (7/25) of positive samples for Toxocara canis eggs is demonstrating that the public squares of Concordia represent a high level of environmental contamination for enteroparasites. Such result was anticipated due to the high number of canine population in the municipal district and their easy access to these places.
