Scanning electron microscopy(SEM)was used to conduct morphological observations on diatoms of the genera Falcula and Pseudofalcula distributed along the coasts of South China and Australia.Falcula media Voigt was reported as a newly recorded diatom species for China,while the ultrastructural morphology of F.semiundulata Voigt was studied for the first time.Morphological differences between Falcula and Pseu-dofalcula were further defined by comparing the former two species with P.hyalina(Takano)Gomez,Wang,&Lin.A key distinguishing feature between the two genera was the structure of the apical pore fields,compri-sing several slits in Falcula,and presenting as an ocellulimbus with a grid-like structure set into the valve man-tle in Pseudofalcula.Falcula species were mainly epiphytic diatoms attached to seaweeds,while Pseudofalcu-la species were typically epizoic and attached to marine copepods.This study expands the geographic distri-bution of F.media,F.semiundulata,and P.hyalina and clarifies the basis of the morphological classification of the Falcula and Pseudofalcula genera.
FalculaPseudofalculaUltrastructureApical pore field
NETL
NSTL
维普
万方数据
