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Redescription and Surface Ultrastructure of Pygidiopsis macrostomum (Digenea: Heterophyidae)

S. B. E. Simões, H. S. Barbosa and C. P. Santos
The Journal of Parasitology
Vol. 91, No. 4 (Aug., 2005), pp. 931-936
Stable URL: http://www.jstor.org/stable/20059786
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Redescription and Surface Ultrastructure of Pygidiopsis macrostomum (Digenea: Heterophyidae)
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Abstract

Pygidiopsis macrostomum Travassos, 1928, a poorly known species originally described from a single specimen from Rattus norvegicus (Erxleben, 1777) in Brazil, is redescribed on the basis of metacercariae from the mesenteries of naturally infected guppies Poecilia vivipara Bloch & Schneider, 1801 (Poeciliidae), and adults obtained from an experimental infection of hamsters. Pygidiopsis macrostomum is characterized by the absence of oral spines, vitellaria extending forward to ventral sucker, uterus reaching pharyngeal level, X-shaped excretory vesicle, and an oral sucker/acetabulum ratio of 1:0.8. The surface ultrastructure shows that the tegument of the metacercaria does not strongly differ from that of adults. The brush-shaped spines of P. macrostomum are similar to those reported for Pygidiopsis summa and Pygidiopsis ardeae, but no differences in spine shape were observed throughout the body.

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