IDEA   23902
INSTITUTO DE DIVERSIDAD Y ECOLOGIA ANIMAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Characterization of a population of the genus Thelastoma associated with Gymnetis litigiosa
Autor/es:
DAMBROSI ORSINI, M.N.; RONDAN DUEÑAS, J.C.; GARDENAL, C.N.; DOUCET, M.E.; LAX, P.
Lugar:
La Serena
Reunión:
Congreso; XLV Reunión Anual de la Organización de Nematólogos de los Trópicos Americanos (ONTA).; 2013
Resumen:
The genus Thelastoma comprises 61 species mainly associated with arthropods. Morphological, morphometric and ecological characteristics were considered to characterize a population detected in Gymnetis litigiosa (Scarabaeidae) from Uruguay; moreover, the 18S gene was partially amplified and sequenced. The hindgut of larvae (n=23) and adults (n=20) of the coleopteran was dissected; nematodes were fixed and processed following classical techniques. Females exhibited a spermatheca on each reproductive branch, the one located on the posterior branch being the most noticeable. Excretory pore located at the middle of the basal esophageal bulb (the most frequent location) or slightly anteriorly, near the isthmus. Tail long and filiform, representing 28% (22-33%) of body length. Males presented a pair of longitudinal lateral wings; spicules absent. Ventrally, some males showed irregular protuberances near the anus; in other specimens, transversal lines composed of small protuberances were observed in the mid and posterior body region. Adults of the insect were not infected whereas in larvae, prevalence was 74% and abundance and mean intensity values were 8.8 and 11.9, respectively. A 885-bp fragment of the 18S gene was amplified; genetic similarity percentages obtained were 95% with T. gueyei and 97% with T. krausi. This genus is first detected in G. litigiosa.