Definition

Noun 1. An extinct class of gymnosperms: Pteridospermopsida refers to a major, now-extinct, group of seed-bearing plants that were most abundant from the Carboniferous to the Jurassic geological periods. They are commonly known as seed ferns, although they are not true ferns, as they reproduced by seeds rather than spores.

Usage Examples

• Noun:
  • Fossil evidence shows that Pteridospermopsida were a dominant component of ancient forests.
  • The study of Pteridospermopsida helps scientists understand the evolution of seed plants.
  • Many plants classified under Pteridospermopsida had fern-like fronds.

Advanced Usage

• In paleobotanical classification: The term is used technically to group together various extinct orders of plants that share the characteristic of bearing seeds on fern-like foliage.
  • The fossil genus Glossopteris is often placed within the Pteridospermopsida.

Variants and Related Words

• Pteridosperm (n): Another, more common term for an individual plant belonging to the Pteridospermopsida class; a "seed fern."
  • The fossil was identified as a pteridosperm.
• Seed fern (n): The common name for plants in this group.
  • Seed ferns are an important part of the fossil record.

Synonyms

• Seed ferns (common name)

Notes on Meaning

This word has a single, specific scientific meaning. It is not used in everyday language and is primarily found in academic texts related to paleobotany, geology, and evolutionary biology. It refers strictly to the taxonomic class.

Noun

1. extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies