Ptilozamites davidovii Sixtel, 1962 species accepted

Ctenopteris punctata Sixtel, 1962 species doubtful

Ptilozamites elegans Sixtel, 1962 species accepted

Ctenopteris cycadea Brongniart, 1872 species doubtful

Ptilozamites leckenbyi (Bean, 1864) species synonym

Ctenis leckenbyi (Bean, 1864) species accepted

Cycadopteris leckenbyi (Bean, 1864) species synonym

Ctenozamites cycadea Brongniart, 1886 species doubtful

Ctenopteris columbiensis Penhallow, 1902 species doubtful

Ctenopteris minor Fontaine, 1889 species synonym

Ctenopteris angustifolia Fontaine, 1889 species doubtful

Zamiopsis insignis (Fontaine, 1889) species synonym

Ctenopteris virginiensis Fontaine, 1889 species synonym

Ctenopteris insignis (Fontaine, 1889) species doubtful

Pterophyllum sandbergeri (Schenk, 1866) species accepted

Ptilozamites tenuis Oishi, 1932 species accepted

Ptilozamites nilssonii Nathorst, 1878 species accepted

Ptilozamites sandbergeri (Schenk, 1866) species synonym

Ptilozamites heeri Nathorst, 1878 species accepted

Ctenopteris longifolia Fontaine, 1889 species doubtful