Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests
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...
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todo:paper_00029122_v96_n11_p2031_Wilf2023-10-03T13:54:42Z Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests Wilf, P. Little, S.A. Iglesias, A. Zamaloa, M.C. Gandolfo, M.A. Cúneo, N.R. Johnson, K.R. Austrocedrus Cupressaceae Eocene Laguna del Hunco Libocedrus Paleoclimate Papuacedrus Patagonia Río Pichileufú Subtropical rainforest biogeographical region biome coniferous tree Eocene fossil record Gondwana new record paleobotany paleoclimate phytogeography rainforest steppe type locality Patagonia South America Austrocedrus Austrocedrus chilensis Cupressaceae Gymnospermae Libocedrus Magnoliophyta Papuacedrus Papuacedrus papuana 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. Fil:Zamaloa, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gandolfo, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cúneo, N.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00029122_v96_n11_p2031_Wilf |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Austrocedrus Cupressaceae Eocene Laguna del Hunco Libocedrus Paleoclimate Papuacedrus Patagonia Río Pichileufú Subtropical rainforest biogeographical region biome coniferous tree Eocene fossil record Gondwana new record paleobotany paleoclimate phytogeography rainforest steppe type locality Patagonia South America Austrocedrus Austrocedrus chilensis Cupressaceae Gymnospermae Libocedrus Magnoliophyta Papuacedrus Papuacedrus papuana |
spellingShingle |
Austrocedrus Cupressaceae Eocene Laguna del Hunco Libocedrus Paleoclimate Papuacedrus Patagonia Río Pichileufú Subtropical rainforest biogeographical region biome coniferous tree Eocene fossil record Gondwana new record paleobotany paleoclimate phytogeography rainforest steppe type locality Patagonia South America Austrocedrus Austrocedrus chilensis Cupressaceae Gymnospermae Libocedrus Magnoliophyta Papuacedrus Papuacedrus papuana Wilf, P. Little, S.A. Iglesias, A. Zamaloa, M.C. Gandolfo, M.A. Cúneo, N.R. Johnson, K.R. Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
topic_facet |
Austrocedrus Cupressaceae Eocene Laguna del Hunco Libocedrus Paleoclimate Papuacedrus Patagonia Río Pichileufú Subtropical rainforest biogeographical region biome coniferous tree Eocene fossil record Gondwana new record paleobotany paleoclimate phytogeography rainforest steppe type locality Patagonia South America Austrocedrus Austrocedrus chilensis Cupressaceae Gymnospermae Libocedrus Magnoliophyta Papuacedrus Papuacedrus papuana |
description |
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. |
format |
JOUR |
author |
Wilf, P. Little, S.A. Iglesias, A. Zamaloa, M.C. Gandolfo, M.A. Cúneo, N.R. Johnson, K.R. |
author_facet |
Wilf, P. Little, S.A. Iglesias, A. Zamaloa, M.C. Gandolfo, M.A. Cúneo, N.R. Johnson, K.R. |
author_sort |
Wilf, P. |
title |
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
title_short |
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
title_full |
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
title_fullStr |
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
title_full_unstemmed |
Papuacedrus (Cupressaceae) in Eocene Patagonia: A new fossil link to Australasian rainforests |
title_sort |
papuacedrus (cupressaceae) in eocene patagonia: a new fossil link to australasian rainforests |
url |
http://hdl.handle.net/20.500.12110/paper_00029122_v96_n11_p2031_Wilf |
work_keys_str_mv |
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