Molecular and Morphological Analyses Suggest Cryptic Diversity of Eel Gobies, Genus Taenioides (Gobiidae), in Coastal Waters of China
Tóm tắt
The current classification of eel goby of genus Taenioides (Gobiidae: Amblyopinae) recognizes two species in coastal waters of China, which is based on morphological differences only. However, such classification could be dubious since the morphological differences among species are usually faint, and more cryptic species have been frequently identified in this genus around the region. To clarify the species diversity of Taenioides in China, we collected specimens that conformed to the definition of Taenioides from the full range of coastal waters in China, and estimated the species diversity and taxonomic validity of the genus proposed based on both molecular and morphological data. As a result, four distinct species were identified which were distinguished from each other on the basis of genetic divergences (0.047–0.128) estimated from all 13 mitochondrial PCGs sequences. The external morphology were generally conservative, but some distinct diagnostic morphological characters (i.e., total number of the dorsal-fin elements, numbers of vertebraes and barbels on the ventral surface of head) that delimit each species were also observed. The combined molecular and morphological data assigned three of them to be T. anguillaris, T. gracilis and Taenioides sp. (clade Thailand sensu Kurita, Yoshino 2012). The remaining one is considered a new confirmed candidate species, instead of the previously recognized T. cirratus. Our analyses provide the first evidence for an underestimation of the species richness in genus Taenioides in China coastal waters, and a taxonomic revision is in need for this genus around the region.
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