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Acta Parasitologica, Vol.43, No. 4, 1998, 209-213
Niewiadomska Katarzyna (1), Niewiadomska-Bugaj Magdalena (2) - Morphometric separation of Diplostomum spathaceum (Rud.) and D. mergi (Dubois) metacercariae (Digenea).

(1) W. Stefanski Institute of Parasitology, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland;
e-mail: niewiadk@twarda.pan.pl;
(2) Department of Statistics, West Virginia University, P.O. Box 6330, Morgantown, WV 26506-6330, USA;
e-mail: mbugaj@stat.wvu.edu

ABSTRACT

The variability and diagnostic usefulness of morphological features of metacercariae of two Diplostomum species, D. spathaceum and D. mergi, were studied on 104 and 85 specimens, respectively. Metacercariae were experimentally raised from cercariae in carp fry, Cyprinus carpio. Fourteen morphometric features and eight indices have been analysed. While no single variable could provide a classification with a reasonably small percentage of error, D. spathaceum and D. mergi have been separated with a misclassification rate less than 1% by applying a logistic regression model based on six significant variables (five metrical features and one index).


KEY WORDS: Morphometry, logistic regression, D. spathaceum, D. mergi, metacercariae
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