The lizard genus Stenocercus is one of the most widely distributed taxa in South America, both geographically and ecologically; nevertheless, parasite-host interactions within the group remain poorly documented. Prior to this study, parasitological studies have been conducted in only two species (S. roseiventris and S. caducus). Thus, the aim of this study is to present new data on helminths infecting S. caducus and S. sinesaccus. A total of 16 specimens were analyzed. For S. caducus, only the nematode Strongyluris oscari found with a prevalence of 7.69%. For S. sinesaccus, three helminth taxa were identified: Subulura lacertilia, Oochoristica sp., and Oswaldocruzia sp., with an overall infection prevalence of 100%. This project presents the first record of parasites for S. sinesaccus and expands the existing parasitological data for S. caducus.
Toxocara cati (Schrank, 1788) es una especie de nemátodo cosmopolita y de gran relevancia epizoótica entre mamíferos depredadores de la familia Felidae. A pesar de su distribución global y las numerosas menciones en la literatura, son escasos los estudios que proporcionan datos morfológicos en machos adultos. El presente estudio tiene como objetivo realizar la primera descripción basada en atributos morfológicos y medidas morfométricas de un ejemplar macho de T. cati registrado en el gato montés (Leopardus geoffroyi (D'Orbigny & Gervais, 1844)) de silvestría en la provincia de San Juan, Argentina. El ejemplar macho de T. cati presentó alas cervicales anchas en forma de punta de flecha, anillo nervioso cerca del poro excretor, espículas desiguales y 22 pares de papilas precloacales en dos filas de 11 y 10 papilas poscloacales. Este estudio aporta información novedosa no antes registrada sobre el parasitismo del gato montés y el primer registro de esta interacción para el centro-oeste de Argentina. El parasitismo de T. cati en el gato montés probablemente representa una interacción con gatos domésticos.
Rhinoptera steindachneri Evermann & Jenkins, 1891, es un elasmobranquio batoideo con importancia comercial en México. En el Golfo de California, junto con rayas de las familias Rhinobatidae, Dasyatidae y Gymnuridae, constituyen el 90% de la producción total de la pesca. Como parte del estudio de parásitos de elasmobranquios en Baja California Sur, se realizaron dos visitas a Puerto Viejo en el Pacífico (junio de 1994 y junio de 1996) y una al Portugués en Bahía de la Paz (septiembre de 2000). En ambas localidades se recolectaron elasmobranquios de la especie en estudio. El objetivo de este estudio es identificar la helmintofauna presente en R. steindachneri. La prevalencia de parasitismo fue del 100%. Los ejemplares de Puerto Viejo (n= siete) mostraron menor riqueza de céstodos de los órdenes Trypanorhyncha (Nybelinia sp. y larva); Lecanicephalidea (Tylocephalum steindachneresis n. sp.) y “Tetraphyllidea” (Serendip deborae Brooks & Barriga, 1995 y S. danbrooksi Monks, Zaragoza-Tapia, Pulido-Flores, and Violante-González, 2015) además del monogéneo Denarycotyle bajacaliforniensis Gómez del Prado-Rosas, 2024 (Monocotylidea) y del digéneo Nagmia puertensis n. sp. (Plagiorchiida). Los ejemplares del Portugués (n= seis) mostraron mayor riqueza de céstodos de los órdenes Trypanorhyncha (Rhinoptericola mexicana n. sp.); Lecanicephalidea (Tylocephalum rhinoptera n. sp.); “Tetraphyllidea” (Dioecotaenia rhinopterata n. sp. y Duplicibothrium cairae); Rhinebothriidea (Rhinebothrium sp.); Phyllobothriidea (Orygmathobothrium sp. y Phyllobothrium steindachneri n. sp.); y el monogéneo Udonella almehensisn. sp. (Gyrodactylidea). No se obtuvieron otros grupos de helmintos. Únicamente ejemplares del género Tylocephalumse presentaron en ambas áreas. Estas localidades representan registros nuevos en la distribución geográfica de la helmintofauna encontrada y Dioecotaenia rhinopterata n. sp., Nybelinia sp. y Orygmathobothrium sp. son nuevos registros en la parasitofauna de R. steindachneri. TRANSLATE with x English Arabic Hebrew Polish Bulgarian Hindi Portuguese Catalan Hmong Daw Romanian Chinese Simplified Hungarian Russian Chinese Traditional Indonesian Slovak Czech Italian Slovenian Danish Japanese Spanish Dutch Klingon Swedish English Korean Thai Estonian Latvian Turkish Finnish Lithuanian Ukrainian French Malay Urdu German Maltese Vietnamese Greek Norwegian Welsh Haitian Creole Persian TRANSLATE with COPY THE URL BELOW Back EMBED THE SNIPPET BELOW IN YOUR SITE Enable collaborative features and customize widget: Bing Webmaster Portal Back
Elasmobranchs play an essential ecological role as top predators in marine ecosystems, and parasitological studies allow the assessment of both host health and the environmental conditions they inhabit. This study analyzed the parasitic diversity of two representative species from the southern coast of the Gulf of Mexico: the bull shark Carcharhinus leucas (Müller & Henle, 1839), captured at several fishing localities in the states of Campeche and Tabasco (Seybaplaya, Champotón, Ciudad del Carmen, and Barra de San Pedro), and the southern stingray Hypanus americanus (Hildebrand & Schroeder, 1928), collected in Seybaplaya, Campeche. In C. leucas, all ten examined specimens showed a 100% prevalence of parasitic infection, with a total of 175 individuals belonging to the groups Monogenea, Cestoda, Nematoda, and Copepoda. The identified taxa were Nesippus orientalis (Heller, 1865), Nemesissp. (Risso, 1826), Paralebion elongatus (Wilson, 1911), Erpocotyle carcharhini (Watson & Thorson, 1976), Granulinema carcharhini (Moravec & Little, 1988), and Nybelinia sp. (Poche, 1926), with cestodes being the most abundant group (64.57%). In 14 examined specimens of H. americanus, a total of 1,775 endoparasites were recorded (953 in males and 822 in females), belonging to the groups Cestoda and Nematoda. In this species, the genera Acanthobothrium (Van Beneden, 1849), Nybelinia (Poche, 1926), Oncomegas (Dollfus, 1929), Pterobothrium (Diesing, 1850), Phyllobothrium (Van Beneden, 1850), Grillotia (Guiart, 1927), and Anisakis (Dujardin, 1845) were identified. Oncomegas showed the highest prevalence (100%) and Phyllobothrium the lowest (7.14%), and Grillotia is reported for the first time in H. americanus from the Gulf of Mexico. Overall, the results reveal a high parasitic diversity dominated by cestodes, which may reflect alterations in coastal habitats. This study provides new parasite records and reinforces the value of parasitology as a tool for understanding biodiversity and assessing the ecological status of elasmobranchs from the southern Gulf of Mexico.
A new species of Rhinoxenoides was described parasitizing the gill filaments of neotropical triportheid fishes. The new species was described from Triportheus angulatus (Spix & Agassiz, 1829) from the Juruá River, State of Acre, Brazil. Rhinoxenoides cruzeirensis n. sp. resembles Rhinoxenoides horacioschneideri Santos Neto, Costa, Soares & Domingues, 2018, mainly by presenting a coiled male copulatory organ (MCO) with clockwise rings; accessory piece with articulation process extending within the coils to the base of MCO; dorsal anchor with well-developed superficial root, and dorsal bar absent. However, it differs from this by number of the coils of the MCO; accessory piece formed by a straight piece that expands in the middle, where it folds over itself; ventral bar short and robust; dorsal anchor with a well-developed superficial root twice as long as the deep root, with a small wing-shaped extension in the distal portion.
