Mataora miocene leaf (Mataoraphyllum miocenicus)

Mataoraphyllum miocenicus: Fossilized Miocene Conifer of New Zealand

Reconstructed leaf assemblages from the late Miocene of New Zealand contain key fossils of Mataoraphyllum miocenicus, an extinct species of the family Taxaceae. This taxon highlights the ancient biogeographical distribution of yew-like conifers in the Southern Hemisphere. Its discovery in the Coromandel Peninsula has provided vital clues about the regional paleoclimate during the Miocene epoch.

Taxonomy

  • ∟ царство Plantae
  • ∟ division Tracheophytes (Vascular Plants)
  • ∟ subdivision Spermatophytes (Seed plants)
  • ∟ superclass Gymnospermae (Gymnosperms)
  • ∟ division Pinophyta (Conifers)
  • ∟ subclass Cupressidae
  • ∟ order Cupressales (Cypresses and junipers)
  • ∟ family Taxaceae (Yew family)
  • ∟ genus Mataoraphyllum (New Zealand liverwort)
  • ∟ species Mataoraphyllum miocenicus (Mataora miocene leaf)

Living Pulse

Morphology

The description of Mataoraphyllum miocenicus relies heavily on fossilized foliage details that show unique taxaceous features. Paleobotanists identify the species by several key leaf characteristics:

  • Cuticular structure: The leaves exhibit well-preserved cuticles with specific stomatal patterns characteristic of the yew family.
  • Leaf shape: The fossilized leaves are typically linear to lanceolate, exhibiting a distinct midvein.
  • Stomatal distribution: Stomata are arranged in prominent bands on the abaxial surface, which helps differentiate this genus from other Miocene conifers.

Interesting facts

Fossil assemblages on the Coromandel Peninsula provide a vivid window into New Zealand's botanical past. Several facts highlight the importance of this fossil species:

  • Southern Hemisphere presence: While modern Taxaceae are predominantly northern, Mataoraphyllum miocenicus proves their historical presence in the South Pacific.
  • Climate reconstruction: The morphology of these fossil leaves indicates a wet, temperate forest climate with high rainfall.
  • Volcanic associations: Many of these leaves were preserved in fine-grained sediments associated with Miocene volcanic activity on the peninsula.

Geography of distribution

  • New Zealand

Sources

  • Pole, M., & Moore, P.R. (2011). A late Miocene leaf assemblage from Coromandel Peninsula, New Zealand, and its climatic implications. Alcheringa, 35(1): 103–121. DOI: 10.1080/03115518.2010.481829
  • International Fossil Plant Names Index (IFPNI).

See also

True Araucarias

True Araucarias

Araucaria sect. Araucaria

Araucaria sect. Araucaria is a botanical section of evergreen conifers native to South America. It …