On the type specimens of the common freshwater shrimp Palaemon paucidens De Haan, 1844 collected by Von Siebold and deposited in Naturalis Biodiversity Center.

Abstract

Recent molecular analyses revealed Palaemon paucidens De Haan, 1844 to be species complex, since three genetically distinct types (designated by types A, B and C) were detected. A mitochondrial 16S rDNA sequence of the lectotype specimen collected by P. F. von Siebold nearly two centuries ago in Japan and held in Naturalis Biodiversity Center (formerly Rijksmuseum van Natuurlijke Historie), Leiden, The Netherlands, was successfully determined to be haplotype JA1 of type A. JA1 is the most predominant haplotype mainly observed from central to southern part of Japan and would be the most accessible type to Von Siebold whose activity range was limited around Nagasaki.