A fossil with a combination of ancestral and derived characters informative about an evolutionary transition. It need not be the direct ancestor of a named living group.
A historical metaphor for a predicted but unsampled evolutionary connection. Modern phylogenetic hypotheses concern branching relationships and character changes rather than one obligatory intermediate.
Preserved evidence of biological activity, such as a track or burrow. It can reveal movement or feeding even without body remains, but usually does not uniquely identify the producer.
A fossil deposit preserving early land-plant anatomy, including reproductive structures interpreted as gametophytes and sporophytes.[ref]
The Gametophyte Generation of Some Early Devonian Land Plants by Winfried Remy and others. Anatomy and proposed generation associations
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