Acer megasamarum

Taxonavigation

Taxonavigation: Sapindales
Classification System: APG IV Superregnum: Eukaryota Cladus: Diaphoretickes Cladus: CAM Cladus: Archaeplastida Regnum: Plantae Cladus: Angiosperms Cladus: Eudicots Cladus: Core eudicots Cladus: Rosids Cladus: Eurosids II Ordo: Sapindales

Familia: Sapindaceae
Subfamilia: Hippocastanoideae
Tribus: Acereae
Genus: Acer
Sectio: Acer sect. Macrophylla
Species:†Acer megasamarum

Name

Acer megasamarum Tanai & N.Suzuki J. Fac. Sci. Hokkaido Univ., Ser. 4, Geol., 10(3): 560-561. 20 Mar 1960

Synonyms

• †Acer oknensis Chelebaeva. 1978.82. text· f. 30-1; pl. 19, f. 5.
• †"Acer grahamensis" auct. non Knowlton & Cockerell. Wolfe & Tanai. 1980.40. pl. 17, F. 6; pl. 18, f. 5; pl. 19. f. 1, 4.

Type material

• Holotype: HU 15027 (fruit)
  • Repository: Paleontology collections, Hokkaido University, Sapporo, Hokkaido, Japan

• Paratype: HU 15028 (fruit)
  • Repository: Paleontology collections, Hokkaido University, Sapporo, Hokkaido, Japan

• Referred material: USNM 20874, 20875, 396182 A&B (leaves) 208473, 396184 (fruits)
  • Repository: United States National Museum, Smithsonian Institution, National Mall, Washington DC, United States

• Referred material: UWBM 56258 (leaf) 56259 (fruit)
  • Repository: Burke Museum of Natural History and Culture, Seattle, King County, Washington, Unites States

Type locality

• Miocene, Burdigalian-Langhian; Kunnui Formation; Setana flora, Setana, Hiyama Subprefecture, Hokkaido, Japan

Etymology

• None given

Distribution

Oligocene

• Late Oligocene
  • Hemlock Conglomerate; Kukak Bay (USGS 11812), Katmai National Park and Preserve, Shelikov strait, Kodiak Island Borough, Alaska, United States

Late Oligocene-Early Miocene

• Seldovian
  • Healy Creek Formation, Usibelli Group; Usibelli flora (USGS 9925), Usibelli coal field, Dora Peak, Alaska range, Denali Borough, Alska, United States
  • Tyonek Formation, Kenai Group; Seldovia Point (USGS 9858), Cook Inlet, Kenai Peninsula Borough, Alaska, United States

Miocene

• Burdigalian-Langhian
  • Kunnui Formation; Setana flora, Setana, Hiyama Subprefecture, Hokkaido, Japan
• Messinian
  • Wilkes Formation; Toledo flora (UWBM 133501), Lower Salmon Creek, Lewis County, Washington, United States

References

Primary references

• Tanai, T. & Suzuki, N. 1960. Miocene maples from southwestern Hokkaido, Japan. Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy 10(3): 551-570. ISSN 0018-3474. http://hdl.handle.net/2115/35915.  Reference page. 
• Wolfe, J.A. & Tanai, T. 1987. Systematics, Phylogeny, and Distribution of Acer (maples) in the Cenozoic of Western North America. Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and Mineralogy 22(1): 1–246.  PDF Reference page. 

Links

• IFPNI International Editorial Board 2014–2026. The International Fossil Plant Names Index. Acer megasamarum. Published online. Accessed: 2026 Jan 13.