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Bivariate Discriminant Analysis for the Identification of Nihonotrypaea Japonica and N. Harmandi (Decapoda: Thalassinidea: Callianassidae)

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Abstract For two callianassid shrimps, Nihonotrypaea japonica (Ortmann) and N. harmandi (Bouvier), morphometric character variations [carapace length (CL), eyestalk width (EsW), cornea width (CoW), and rostrum angle (RA)] were examined based on the materials collected from sandflats in western Kyushu, Japan. Allometric relationships were established between each combination of two morphometric characters for each species, in which CL was fixed on the abscissa as a reference variable. The values of EsW and CoW linearly increase with the CL value, with the slopes similar for EsW between the two species and a steeper slope for CoW in N. harmandi. By using the combination of (CoW/EsW) ratio vs. CL and that of RA vs. CL, bivariate discriminant analyses were run to establish an appropriate function separating the two species in each combination. The relatively smaller cornea size in N. japonica and more acute rostrum angle in N. harmandi were confirmed as the two effective characters that separate the two species. On the basis of the overall misclassification probabilities, the linear discriminant function using (CoW/EsW) ratio and CL was regarded as best to correctly separate the two species for practical use.

Affiliations: 1: a Nagasaki University, Marine Research Institute, Faculty of Fisheries, Taira-Machi 1551-7, Nagasaki 851-2213, Japan


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