pteropsida

Thân thiện

A student examines a pteropsida specimen in a botany textbook.

Definition

Noun: 1. A former taxonomic grouping: "Pteropsida" was a term used in older, now largely obsolete, biological classification systems. It designated a large subdivision or class of plants that included all ferns and seed plants (both flowering and non-flowering).

Usage Notes

• The term "Pteropsida" is primarily of historical interest in botany and taxonomy. Modern phylogenetic classification, based on evolutionary relationships, no longer uses this grouping.
• It is a technical term encountered in historical botanical literature or in the context of the development of plant classification systems.

Examples

• Noun:
  • In the Engler system, the division Pteropsida encompassed ferns, conifers, and flowering plants.
  • The classification of Pteropsida has been superseded by more accurate phylogenetic models.

Advanced Usage

• The concept of "Pteropsida" illustrates how scientific understanding and terminology evolve. It represents an earlier attempt to organize plant life based on morphological characteristics (like the presence of vascular tissue and specific reproductive structures) before the widespread use of genetic data.

Variants and Related Words

• Pteridophyte (n): In modern taxonomy, this term refers to vascular plants that reproduce via spores, such as ferns, horsetails, and clubmosses. It is a more precise, currently accepted term for part of what was once in "Pteropsida."
• Spermatophyte (n): This modern term refers to seed plants, including gymnosperms (like conifers) and angiosperms (flowering plants). This group constitutes the other major part of the historical "Pteropsida."

Synonyms

• Vascular plants (in a very broad, non-taxonomic sense): This is a modern descriptive term for plants with specialized tissue (xylem and phloem) for transporting water and nutrients, which includes all members of the former "Pteropsida." However, it is not a direct synonym as it is a descriptive category, not a formal taxonomic rank.

Học thuật

Noun

1. used in former classifications to include all ferns and flowering plants and divided into the three classes Filicinae and Gymnospermae and Angiospermae

Từ đồng nghĩa

• Pteropsida
• subdivision Pteropsida