DNA barcoding and species and subspecies classification within genus Carassius
2013
The classification of Carassius has not been well established due to
its great variability and wide distribution. Usually, Carassius is
identified as three species: C. carassius , C. cuvieri and C.
auratus , the latter including several subspecies, such as goldfish.
Out of these subspecies, C. auratus gibelio have recently been
thought of as a valid species of Carassius. In this study we collected
the 5′end 651 bp segments of the mitochondrial cytochrome c
oxidase I (COI) gene from 128 specimens, including C. carassius, C.
cuvieri, C. auratus auratus, C. auratus gibelio and C. auratus
langsdorfii . All three species of Carassius (C. carassius, C.
cuvieri, C. auratus) were found to be valid, meanwhile genetic
differentiation between the Eurasian C. auratus and Japanese C. auratus
has reached a high level. However, several haplotypes were shared
between C. auratus auratus and C. auratus gibelio. Consequently, C.
auratus gibelio should be regarded as a subspecies of C. auratus rather
than a valid species. Moreover, because both diploids and triploids
exist in C. auratus auratus and C. auratus gibelio, ploidy level should
not be used as criteria for the classification of species or subspecies
in Carassius.
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