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Systematics and distribution of Cristaria plicata (Bivalvia, Unionidae) from the Russian Far East.

Klishko OK, Lopes-Lima M, Froufe E, Bogan AE, Abakumova VY - Zookeys (2016)

Bottom Line: No significant differences have been revealed by the COI DNA sequences or the main statistical morphometric indices from the three Cristaria forms.We consider that Cristaria plicata, Cristaria tuberculata and Cristaria herculea from the Russian Far East should be considered as a single species, namely Cristaria plicata (Leach, 1815), with Cristaria tuberculata and Cristaria herculea as junior synonyms.The geographic range of Cristaria plicata and its conservation status are also presented here.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Natural Resources, Ecology and Cryology, Russian Academy of Sciences Siberian Branch, Chita 672014, Russia.

ABSTRACT
The number of anodontine bivalve species placed in the genus Cristaria (Bivalvia, Unionidae) from the Russian Far East is still not stable among authors. Some recognize only one valid species Cristaria plicata (Leach, 1815) while others accept two additional species, Cristaria tuberculata Schumacher, 1817 and Cristaria herculea (Middendorff, 1847). In the present study, these taxonomic doubts are addressed using analyses of mitochondrial DNA sequences and shell morphometry. No significant differences have been revealed by the COI DNA sequences or the main statistical morphometric indices from the three Cristaria forms. In the specimens analysed, changes in shell morphometry with age suggest that original descriptions of the different forms may be attributed solely to differences in age and sex. We consider that Cristaria plicata, Cristaria tuberculata and Cristaria herculea from the Russian Far East should be considered as a single species, namely Cristaria plicata (Leach, 1815), with Cristaria tuberculata and Cristaria herculea as junior synonyms. The geographic range of Cristaria plicata and its conservation status are also presented here.

No MeSH data available.


A Variation of the R-index with shell length B range and mean values of R-index for Far East Russian specimens of Cristariaplicata, Cristariaherculea and Cristariatuberculata.
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Figure 3: A Variation of the R-index with shell length B range and mean values of R-index for Far East Russian specimens of Cristariaplicata, Cristariaherculea and Cristariatuberculata.

Mentions: Not only do the morphometric characteristics change with the increase of shell length, but these may also vary considerably in shells from the same size. In fact, all morphometric indexes calculated in this study for Cristaria taxa showed wide variation (Figs 3–4). The sole character separating or distinguishing Cristariaherculea and Cristariatuberculata, according to Starobogatov et al. (2004) (here referred as the R-index), varied from 0.727 to 0.866 with shell lengths of 100–250 mm (Fig. 3A). R-indices for Cristariaplicata with the same shell lengths varied from 0.735 to 0.885, completely overlapping the R-index variation ranges for Cristariaherculea and Cristariatuberculata (Fig. 3A, B).


Systematics and distribution of Cristaria plicata (Bivalvia, Unionidae) from the Russian Far East.

Klishko OK, Lopes-Lima M, Froufe E, Bogan AE, Abakumova VY - Zookeys (2016)

A Variation of the R-index with shell length B range and mean values of R-index for Far East Russian specimens of Cristariaplicata, Cristariaherculea and Cristariatuberculata.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4829948&req=5

Figure 3: A Variation of the R-index with shell length B range and mean values of R-index for Far East Russian specimens of Cristariaplicata, Cristariaherculea and Cristariatuberculata.
Mentions: Not only do the morphometric characteristics change with the increase of shell length, but these may also vary considerably in shells from the same size. In fact, all morphometric indexes calculated in this study for Cristaria taxa showed wide variation (Figs 3–4). The sole character separating or distinguishing Cristariaherculea and Cristariatuberculata, according to Starobogatov et al. (2004) (here referred as the R-index), varied from 0.727 to 0.866 with shell lengths of 100–250 mm (Fig. 3A). R-indices for Cristariaplicata with the same shell lengths varied from 0.735 to 0.885, completely overlapping the R-index variation ranges for Cristariaherculea and Cristariatuberculata (Fig. 3A, B).

Bottom Line: No significant differences have been revealed by the COI DNA sequences or the main statistical morphometric indices from the three Cristaria forms.We consider that Cristaria plicata, Cristaria tuberculata and Cristaria herculea from the Russian Far East should be considered as a single species, namely Cristaria plicata (Leach, 1815), with Cristaria tuberculata and Cristaria herculea as junior synonyms.The geographic range of Cristaria plicata and its conservation status are also presented here.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute of Natural Resources, Ecology and Cryology, Russian Academy of Sciences Siberian Branch, Chita 672014, Russia.

ABSTRACT
The number of anodontine bivalve species placed in the genus Cristaria (Bivalvia, Unionidae) from the Russian Far East is still not stable among authors. Some recognize only one valid species Cristaria plicata (Leach, 1815) while others accept two additional species, Cristaria tuberculata Schumacher, 1817 and Cristaria herculea (Middendorff, 1847). In the present study, these taxonomic doubts are addressed using analyses of mitochondrial DNA sequences and shell morphometry. No significant differences have been revealed by the COI DNA sequences or the main statistical morphometric indices from the three Cristaria forms. In the specimens analysed, changes in shell morphometry with age suggest that original descriptions of the different forms may be attributed solely to differences in age and sex. We consider that Cristaria plicata, Cristaria tuberculata and Cristaria herculea from the Russian Far East should be considered as a single species, namely Cristaria plicata (Leach, 1815), with Cristaria tuberculata and Cristaria herculea as junior synonyms. The geographic range of Cristaria plicata and its conservation status are also presented here.

No MeSH data available.