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Glite Dictionary
progymnosperm

progymnosperm

1 9.9
Ancient plants that had parts like ferns and early seed plants
  • noun
  • /ˌproʊdʒɪmˈnoʊspɜrm/
  • Specialized
: progimnosperma
  • The structure of progymnosperm wood is remarkably similar to that of modern conifers.

Examples

  • Studying progymnosperms has helped scientists understand the evolution of seed-bearing plants.

  • Fossil evidence suggests that progymnosperms were widespread during the Devonian period.

  • The progymnosperm fossils were discovered in a remote area.

  • Many scientists study progymnosperms to understand plant evolution.

  • Fossil evidence suggests that progymnosperms were widespread during the Devonian period.

  • Studying progymnosperms has helped scientists understand the evolution of seed-bearing plants.

  • The structure of progymnosperm wood is remarkably similar to that of modern conifers.

Surface Forms

progymnosperm singular
progymnosperms plural

Morphology

progymnosperm = gymnosperm (opaque) = pro + gymno + sperm

For someone who knows 'gymnosperm', the scientific prefix 'pro-' can suggest an earlier or ancestral form, but the taxonomic meaning is specialized rather than fully everyday.

Etymology

Progymnosperm starts with pro- meaning 'before' (as in prologue) and ends with gymnosperm, where gymnos means 'naked' and sperma means 'seed'. So a progymnosperm is a plant that lived 'before' the 'naked-seed' plants, which is why scientists think they are early ancestors of modern seed plants.