NEW SPECIES AND NEW RECORDS OF FOSSIL DIATOMS FROM CHINA

In the present paper, one new fossil diatom species, Gomphonema j ianghanensis sp.nov., is described.Its characteristic is valve narrowly lanceolate or linear- lanceolate with rounded headpole and narrowly rounded footpole.Axial area is narrow.Central area is distinct and transversely rectangular with one shortened striae on one margin, and has, or not, one shortened striae on the othermargin.It lack stigma.Raphe is linear, curved towards the proximal ends and reflexed towards the other side at the distal ends.Striae radiate throughout and slightly curved on the central margin.There are not striae near the disal ends in light microscope.Striae in themiddle port ion 6-9 in 10m, up to 11-13 in 10 m towards the ends.Length is 20-30 m and breadth is 4-7m.