Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy External Literature Search Age range and collections



Synonymy list
YearName and author
2009Hapsidophyllas Bamforth and Narbonne pp. 902 – 903
2012Hapsidophyllas Brasier et al. p. 1119

Is something missing? Join the Paleobiology Database and enter the data


If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

E. L. Bamforth and G. M. Narbonne 2009Decimeter-scale, multibranched fossil consisting of numerous ovate to lanceolate leaflets arranged in a radial configuration about an elongate basal basal rod. Leaflets with prominent, flexible central stalks bearing multiple primary branches emerging sub-perpendicularly along the length of the central stalk, alternately branching on either side. Secondary branches emerging perpendicularly to and along the length of each primary branch.
M. D. Brasier et al. 2012Frond bipolar, comprising two rows of primary branches emanating alternately from a central axis, which may be displayed (Figs 7A–B and 8G). Inflation of first-order branches is proximal, and inflation of second-order branches is also proximal. First-order branches show sub- parallel alignments of units with displayed structure, with both furled and freely overlapping margins. Second-order branches are often poorly preserved, but are seemingly rotated and furled, and possess subparallel alignments. A basal disc is not seen.