Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests

Peter Wilf, Stefan A. Little, Ari Iglesias, María del Carmen Zamaloa, María A. Gandolfo, N. Rubén Cúneo, Kirk R. Johnson

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The 51.9 Ma Laguna del Hunco (LH) and 47.5 Ma Rí o Pichileuf ú (RP) floras from Patagonia, Argentina are unusually rich, angiosperm-dominated assemblages with living relatives in the low-latitude West Pacific, neotropics, and temperate southern latitudes. The diverse gymnosperms in these floras are important for Gondwanan biogeographic history and paleoclimatic interpretations. "Libocedrus" prechilensis Berry 1938 (Cupressaceae), previously known only from the holotype (RP), a vegetative branch, is revised here based on new material from both localities, including a seed cone attached to a shoot with cuticle (LH). Characters of these fossils are diagnostic of monotypic Papuacedrus (highlands of New Guinea and Moluccas). Living P. papuana is most abundant in cloud forests receiving up to 4 m rainfall annually, whereas Austrocedrus (Libocedrus) chilensis, the basis of comparison when the fossil species was named, inhabits dry, cold steppe margins to mediterranean climates in southern South America. We establish Papuacedrus prechilensis comb. nov., which simultaneously invalidates a southern South American connection for the fossil floras and reveals a link to West Pacific montane rainforests. Combined evidence indicates a biome similar to extant subtropical, or tropical montane, rainforests that persisted for at least 4.4 Myr, linking elevated floral richness to abundant rainfall.

Original languageEnglish (US)
Pages (from-to)2031-2047
Number of pages17
JournalAmerican journal of botany
Volume96
Issue number11
DOIs
StatePublished - Nov 1 2009

Fingerprint

Libocedrus
Cupressaceae
rainforest
rain forests
Eocene
flora
Argentina
fossils
Gymnosperms
New Guinea
fossil
Angiosperms
Comb and Wattles
South America
Climate
Libocedrus chilensis
Ecosystem
rain
Fruit
Seeds

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

Cite this

Wilf, P., Little, S. A., Iglesias, A., Zamaloa, M. D. C., Gandolfo, M. A., Cúneo, N. R., & Johnson, K. R. (2009). Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests. American journal of botany, 96(11), 2031-2047. https://doi.org/10.3732/ajb.0900085
Wilf, Peter ; Little, Stefan A. ; Iglesias, Ari ; Zamaloa, María del Carmen ; Gandolfo, María A. ; Cúneo, N. Rubén ; Johnson, Kirk R. / Papuacedrus (Cupressaceae) in Eocene Patagonia : A new fossil link to Australasian rainforests. In: American journal of botany. 2009 ; Vol. 96, No. 11. pp. 2031-2047.
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Wilf, P, Little, SA, Iglesias, A, Zamaloa, MDC, Gandolfo, MA, Cúneo, NR & Johnson, KR 2009, 'Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests', American journal of botany, vol. 96, no. 11, pp. 2031-2047. https://doi.org/10.3732/ajb.0900085

Papuacedrus (Cupressaceae) in Eocene Patagonia : A new fossil link to Australasian rainforests. / Wilf, Peter; Little, Stefan A.; Iglesias, Ari; Zamaloa, María del Carmen; Gandolfo, María A.; Cúneo, N. Rubén; Johnson, Kirk R.

In: American journal of botany, Vol. 96, No. 11, 01.11.2009, p. 2031-2047.

Research output: Contribution to journalArticle

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