Morphometric data on larval and adult specimens of Angiostrongylus (Parastrongylus) costaricensis Morera & Céspedes, 1971 recovered from Swiss albino mice experimentally infected is presented. Infective larvae were obtained from parasitized veronicellid Sarasinula margínala (Semper, 1885) maintained in the laboratory. This is the first complete morphometric study regarding specimens of a Brazilian strain of A. (P.) costaricensis.
Nematoda; Angiostrongylus (P.) costaricensis; Mollusca; Sarasinula margínala; taxonomy; morphology; Brazil