RESUMEN
Based on the examination of diverse crustacean taxa collected along the Mexican Pacific and deposited in the Colección Nacional de Crustáceos of the Instituto de Biología, UNAM, six species of bopyrid isopods were detected. New hosts and localities are reported for Munidion pleuroncodis Markham, 1975, Probopyrus pacificensis Román-Contreras, 1993, Probopyrus markhami Román-Contreras, 1996, Progebiophilus bruscai Salazar-Vallejo & Leija-Tristán, 1990 and Schizobopyrina striata (Nierstrasz & Brender à Brandis, 1929). Cataphryxus zapoteca sp. nov., is described as abdominal parasite of the shrimp Lysmata galapagensis Schmitt; this bopyrid is the second species described in the genus Cataphryxus Shiino, 1936 and the first registered on the American continent. Taxonomic characters, distribution and some reproductive data for five of the six species examined are provided in order to update the knowledge of this parasite group in this Eastern Pacific region.
Asunto(s)
Decápodos , Isópodos , Parásitos , Animales , Especificidad de la Especie , Decápodos/parasitología , MéxicoRESUMEN
To determine that Paragonimus sp. is actively transmitted in a tropical area of the Pacific region of Ecuador where human cases of pulmonary paragonimiasis have recently been documented, a total of 75 freshwater crabs were collected from 2 different streams in the Pedernales area of Manabí Province, Ecuador. All collected crabs were identified as Hypolobocera guayaquilensis based on morphological characteristics of the male gonopods. The hepatopancreas of each crab was examined by compressing it between 2 glass plates followed by observation under a stereomicroscope. Excysted Paragonimus metacercariae were detected in 39 (52.0%) crabs and their densities varied from 1 to 32 per infected crab. There was a positive relationship between crab size and metacercarial density. Sequences of the second internal transcribed spacer region of the ribosomal RNA gene of the Paragonimus metacercariae obtained in this study were identical to those of Paragonimus mexicanus deposited in the DDBJ/EMBL/GenBank database. Thus, the present study is the first to confirm that the crab species H. guayaquilensis is the second intermediate host of P. mexicanus in Manabí Province, Ecuador. Because this crab might be the possible source of human infections in this area, residents should pay attention to improper crab-eating habits related with a neglected parasitic disease, i.e., paragonimiasis.
Asunto(s)
Decápodos/parasitología , Enfermedades Transmitidas por los Alimentos/parasitología , Interacciones Huésped-Parásitos , Paragonimiasis/parasitología , Paragonimus/aislamiento & purificación , Animales , Ecuador/epidemiología , Femenino , Enfermedades Transmitidas por los Alimentos/prevención & control , Humanos , Masculino , Metacercarias/aislamiento & purificación , Paragonimiasis/epidemiología , Paragonimiasis/prevención & controlRESUMEN
Metacercarial stages of digeneans were collected from decapod crustaceans inhabiting intertidal rocky zones in central Chile. The digeneans were identified through a molecular analysis based on the V4 region of the 18S ribosomal RNA gene. We analyzed 356 crustaceans belonging to 10 species, 115 intertidal fish belonging to 6 species, and 4 specimens of 1 coastal bird species. In total, 74.1% of crustaceans were parasitized with metacercariae. We found 1 species of Opecoelidae. This species showed low genetic divergence (0% and 0.1%) with adult digeneans found in intertidal fish and with the species Helicometrina labrisomi infesting a subtidal fish from northern Chile (Labrisomus philippii). Additionally, we found 2 species of Microphallidae, 1 closely related to Maritrema (1.3% genetic distance) and the other related to Microphallus (5% genetic distance). Therefore, our findings showed that the decapod crustaceans are relevant hosts in food webs from the southeastern Pacific coast. Furthermore, we found 5 species of crustaceans as second intermediate hosts for H. labrisomi and 2 species as secondary intermediate hosts for 2 Microphallidae, which contribute to elucidate parts of their life cycles through molecular markers and extended the host distribution of H. labrisomi in the southeastern Pacific coast.
Asunto(s)
Enfermedades de las Aves/parasitología , Decápodos/parasitología , Enfermedades de los Peces/parasitología , Estadios del Ciclo de Vida , Trematodos/fisiología , Infecciones por Trematodos/veterinaria , Algoritmos , Animales , Enfermedades de las Aves/epidemiología , Enfermedades de las Aves/transmisión , Aves , Chile/epidemiología , Enfermedades de los Peces/epidemiología , Enfermedades de los Peces/transmisión , Peces , Marcadores Genéticos , Funciones de Verosimilitud , Metacercarias/fisiología , Filogenia , Prevalencia , ARN Ribosómico 18S/genética , Trematodos/clasificación , Trematodos/genética , Infecciones por Trematodos/epidemiología , Infecciones por Trematodos/transmisiónRESUMEN
A total of 29,570 false king crab Paralomis granulosa were sampled from the Beagle Channel (54 degrees 51'S, 68 degrees 12'W), Tierra del Fuego, Argentina, between July 1996 and August 1998. Crab size varied from 6.8 to 111.2 mm carapace length (CL). A few crabs parasitized by the rhizocephalan Briarosaccus callosus were found; prevalences of externae (the rhizocephalan reproductive body) and scars (the mark left on the host after the death of the parasite) were 0.28 and 0.16%, respectively. Of 85 externae examined, 55 were non-ovigerous and 30 ovigerous. The cryptoniscid isopod Liriopsis pygmaea infested 36.5% of the B. callosus examined. The most abundant stage was the cryptonicus larva, accounting for 208 of the 238 L. pygmaea recovered. Cryptonisci showed a highly aggregated distribution. A total of 92.7% of cryptonicsci were recovered inside empty externae, suggesting that the latter were attractive to cryptonisci. Early subadult females of L. pygmaea were rare; only 3 individuals occurred inside 1 ovigerous externa. Eight late subadult and 18 adult females were found on 3 and 7 non-ovigerous externae, respectively; in addition, 1 aberrant late subadult was found on 1 ovigerous externa. In the Beagle Channel, the population of P. granulosa harbours 3 different parasites: the bopyrid isopod Pseudione tuberculata, which reaches highest prevalence at 10 to 20 mm CL, the rhizocephalan B. callosus, with highest prevalence at 20 to 40 mm CL, and the cryptoniscid isopod L. pygmaea, which mainly infests rhizocephalan on crabs >40 mm CL.
Asunto(s)
Decápodos/parasitología , Isópodos/crecimiento & desarrollo , Estadios del Ciclo de Vida , Animales , Argentina , Interacciones Huésped-Parásitos , Isópodos/anatomía & histología , Isópodos/fisiología , Larva/anatomía & histología , Prevalencia , Agua de MarRESUMEN
The life history of Ascarophis marina in Argentina is proposed on the basis of morphometric features of larval and adult specimens, as well as of trophic relationships among invertebrate and vertebrate hosts in the same geographic area. Adult and larval specimens of A. marina were found in the alimentary tract of the teleost fishes Parona signata (Carangidae) and Urophycis brasiliensis (Gadidae). Third-stage larvae ocurred in the shrimps Peisos petrunkevitchi (Sergestidae) and Artemesia longinaris (Penaeidae).
Asunto(s)
Decápodos/parasitología , Peces/parasitología , Nematodos/crecimiento & desarrollo , Infecciones por Nematodos/veterinaria , Animales , Argentina , Femenino , Enfermedades de los Peces/parasitología , Interacciones Huésped-Parásitos , Estadios del Ciclo de Vida/fisiología , Masculino , Nematodos/anatomía & histología , Nematodos/clasificación , Nematodos/aislamiento & purificación , Infecciones por Nematodos/parasitologíaRESUMEN
Cellular oxidative stress may promote damage or death in biological systems and may be caused by production of pro-oxidant molecules known as reactive oxygen species (ROS). The aim of this work was to analyze the activity of antioxidant enzymes (catalase [CAT], superoxide dismutase [SOD] and glutathione peroxidase [GPx]) in the shrimp Palaemonetes argentinus Nobili, 1901 infected by Probopyrus ringueleti (Verdi & Schuldt, 1987), a gill chamber parasite known for its capacity to cause host metabolic changes, including changes in oxygen consumption rates. Infested and non-infested shrimp were collected in the Patos Lagoon estuary (southern Brasil), where the prevalence of the parasite may be as high as 70%. No significant differences were observed for either CAT or GPx activities. However, SOD activity was significantly reduced in infected shrimp, suggesting that bopyrid isopod respiratory impairment resulted in reduced SOD enzyme activity.
Asunto(s)
Crustáceos/fisiología , Decápodos/enzimología , Decápodos/parasitología , Superóxido Dismutasa/metabolismo , Animales , Consumo de OxígenoRESUMEN
Orbione bonnieri, un pequeño isópodo, recolectado como ectoparásito del camarón marino, Palaemon lamarrei, es descrito por primera vez en la India
Asunto(s)
Animales , Crustáceos/parasitología , Decápodos/parasitología , Infestaciones Ectoparasitarias/epidemiología , Parásitos/aislamiento & purificación , Interacciones Huésped-Parásitos/fisiologíaRESUMEN
Opecoeloides feliciae n. sp., first record of opecoelid metacercariae in commercial shrimps of South Atlantic Ocean, parasitizing Cynoscion striatus (adults) and Artemesia longinaris (metacercariae), is described, illustrated and compared with related species of the genus. Adults, immature worms and metacercariae are compared, and rates of prevalence and intensity of infection are also given.
Asunto(s)
Decápodos/parasitología , Peces/parasitología , Trematodos , AnimalesRESUMEN
Parasitism of the isopod Progebiophilus bruscai Salazar-Vallejo & Leija-Tristán over the common mud shrimp, Upogebia dawsoni Williams, was analysed in the Ensenada and Bahia de La Paz, Baja California Sur, Mexico. Mud-shrimps were collected in three similar sites that differ in grain size and in the anthropogenic organic matter enrichment. Four-hundred-nine mud-shrimps were collected; the largest abundance was registered in the organically enriched site, but they were significantly smaller and more heavily parasited than the animals from the site lacking such organic enrichment. The size of the parasite is clearly dependent on the size of the mud-shrimp. This is the first study of the upogebiid-bopyris relationship in Mexico.
Asunto(s)
Decápodos/parasitología , Interacciones Huésped-Parásitos , Animales , Femenino , Masculino , México , Factores SexualesRESUMEN
Se informa del hallzgo de Probopyrus pandalicola (Isopoda: Bopyridae) en la cavidad branquial de camrones carideos de la familia Palaemonidae (Palaemonetes hiltonii), colectados durante 1986 y 1987 en los esteros de Cocoroca y Punta Morales, Golfo de Nicoya (10N y 85 W), Costa Rica. Se dan además detalles morfológicos de la hembra, del macho y de las formas larvales epicarideas del bopírido