Additional observations on the morphology and hosts of Ixodes stilesi Neumann, 1911 (Acari: Ixodidae).

ALBERTO A. GUGLILEMONE, SANTIAGO NAVA, DANIEL GONZÁLEZ-ACUÑA, ATILIO J. MANGOLD AND RICHARD ROBBINS.

Systematic And Applied Acarology

Año: 2007 vol. 12 p. 135 - 139

1362-1971

Three females and a nymph of Ixodes stilesi were collected by dragging ground vegetation in a southern beech(Nothofagus) forest at San Martin (39º 38’S, 73º 75’W), Valdivia Province, Los Ríos Region (Region XIV),Chile, 20 April 2005 and 1 April 2006; a second nymph was removed from the long-tailed pygmy rice rat orcolilargo, Oligoryzomys longicaudatus (Bennett), same locality, 20 April 2005. The 16S rDNA sequence forone of the I. stilesi females showed 100% agreement with the sequence for this species deposited in GenBank.The morphology of our nymphal specimens agrees with a recently published description of the nymph, but ourfemales of I. stilesi differ from the redescription of a partly engorged female in four respects: 1) cornuaprominent and triangular instead of small, rectangular and blunt; 2) hypostome pointed instead of roundedapically; 3) genital aperture situated between coxae III and IV instead of between coxae II and III; 4) anal groovehorseshoe shaped instead of U shaped. In the female described earlier, the cornua and hypostomal apex werelikely damaged when the specimen was removed from its host, while differences in the position of the genitalaperture and shape of the anal groove may be due to the effects of engorgement on the integument. This is thefirst record of I. stilesi from O. longicaudatus.