Fig. 1

The sampling stations of benthic dinoflagellate in Weizhou Island, Guangxi"

Fig. 2

Scanning electron micrographs (a-d) and light micrographs (e-l) of A. operculatum. a) Ventral view; b) dorsal view; c) antapical view; d) binary division cell; e) ventral view, with black arrow pointing to the pusule and white arrow pointing to the eyespot; f) black arrow pointing to the eyespot; g) nucleus; h. distribution and shape of chloroplast; (i-k) A. operculatum with different shapes; l) binary division cell. Scale bars in a-l: 10 μm"

Fig. 3

Scanning electron micrographs (a-d) and light micrographs (e-m) of A. massartii. a) Dorsal view; b) side view; c) ventral view, with arrow pointing to the pore of transverse flagellum; d) surface of cell; (e-f) ventral view, with arrow pointing to the pyrenoid; g) dorsal view, with arrow pointing to the pyrenoid; h) binary division cell; (i-j) nucleus; (k-m) distribution and shape of chloroplast. Scale bars in a-c and e-m: 5 μm; d: 2 μm"

Tab. 1

Comparison of the morphological characters of three species of Amphidinium"

Fig. 4

Scanning electron micrographs (a-d) and light micrographs (e-h) of A. carterae. a) Ventral view, with arrow pointing to the pore of flagellum; b) dorsal view; c) the dorsal view of epicone; d) surface of cell; e) ventral view, with arrow pointing to the pyrenoid; f) dorsal view, with arrow pointing to the pyrenoid; g) nucleus; h) the distribution and shape of chloroplast"

Fig. 5

Bayesian inference (BI) tree of the LSU rDNA (D1-D3 regions) of Amphidinium species. The number on the branch is the Posterior probabilities for BI analysis (left) and bootstrap values for maximum likelihood analysis (right). Support values below 50% have been omitted"