Insects from the Upper Miocene Grubstake Formation of Alaska
Well-preserved insect wings are reported in weakly consolidated lacustrine shale from the Grubstake Formation, Upper Miocene of Suntrana Creek, central Alaska. 40Ar/39Ar dating of an immediately overlying volcanic ash indicates an age of slightly more than 6.7 ± 0.1 Ma, or approximately one million...
Published in: | American Museum Novitates |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
American Museum of Natural History
2008
|
Subjects: | |
Online Access: | https://doi.org/10.1206/602.1 |
id |
ftbioone:10.1206/602.1 |
---|---|
record_format |
openpolar |
spelling |
ftbioone:10.1206/602.1 2024-06-02T08:04:18+00:00 Insects from the Upper Miocene Grubstake Formation of Alaska David A. Grimaldi Don M. Triplehorn David A. Grimaldi Don M. Triplehorn world 2008-06-16 text/HTML https://doi.org/10.1206/602.1 en eng American Museum of Natural History doi:10.1206/602.1 All rights reserved. https://doi.org/10.1206/602.1 Text 2008 ftbioone https://doi.org/10.1206/602.1 2024-05-07T01:03:04Z Well-preserved insect wings are reported in weakly consolidated lacustrine shale from the Grubstake Formation, Upper Miocene of Suntrana Creek, central Alaska. 40Ar/39Ar dating of an immediately overlying volcanic ash indicates an age of slightly more than 6.7 ± 0.1 Ma, or approximately one million years before the opening of the Bering land bridge. The insects include four genera and two subfamilies of ants (Hymenoptera: Formicidae: Myrmicinae and Dolichoderinae), a species of Ichneumonidae (Hymenoptera), three genera and families of flies (Diptera: Chironomidae [genus indet.], Bibionidae [Bibio] and Lonchaeidae [Dasiops]), and the elytra of curculionid and carabid beetles. Extant distributions of the flies and possibly the ichneumonid include northerly latitudes around Suntrana. The ants are attributable to the extant genera Dolichoderus or Tapinoma (Dolichoderinae), Solenopsis or Erebomyrma (Myrmicinae), as well as Veromessor and Novomessor (Myrmicinae), indicating extensive biogeographic contraction to more southern latitudes of North America today. These finds are consistent with evidence from a slightly younger deposit from the uppermost Miocene (5.7 Ma) of the Seward Peninsula, Alaska. Implications are discussed regarding the differential effects of climate change and land bridges on the dispersal of various insect taxa. Text Bering Land Bridge Seward Peninsula Alaska BioOne Online Journals American Museum Novitates 3612 1 1 |
institution |
Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
description |
Well-preserved insect wings are reported in weakly consolidated lacustrine shale from the Grubstake Formation, Upper Miocene of Suntrana Creek, central Alaska. 40Ar/39Ar dating of an immediately overlying volcanic ash indicates an age of slightly more than 6.7 ± 0.1 Ma, or approximately one million years before the opening of the Bering land bridge. The insects include four genera and two subfamilies of ants (Hymenoptera: Formicidae: Myrmicinae and Dolichoderinae), a species of Ichneumonidae (Hymenoptera), three genera and families of flies (Diptera: Chironomidae [genus indet.], Bibionidae [Bibio] and Lonchaeidae [Dasiops]), and the elytra of curculionid and carabid beetles. Extant distributions of the flies and possibly the ichneumonid include northerly latitudes around Suntrana. The ants are attributable to the extant genera Dolichoderus or Tapinoma (Dolichoderinae), Solenopsis or Erebomyrma (Myrmicinae), as well as Veromessor and Novomessor (Myrmicinae), indicating extensive biogeographic contraction to more southern latitudes of North America today. These finds are consistent with evidence from a slightly younger deposit from the uppermost Miocene (5.7 Ma) of the Seward Peninsula, Alaska. Implications are discussed regarding the differential effects of climate change and land bridges on the dispersal of various insect taxa. |
author2 |
David A. Grimaldi Don M. Triplehorn |
format |
Text |
author |
David A. Grimaldi Don M. Triplehorn |
spellingShingle |
David A. Grimaldi Don M. Triplehorn Insects from the Upper Miocene Grubstake Formation of Alaska |
author_facet |
David A. Grimaldi Don M. Triplehorn |
author_sort |
David A. Grimaldi |
title |
Insects from the Upper Miocene Grubstake Formation of Alaska |
title_short |
Insects from the Upper Miocene Grubstake Formation of Alaska |
title_full |
Insects from the Upper Miocene Grubstake Formation of Alaska |
title_fullStr |
Insects from the Upper Miocene Grubstake Formation of Alaska |
title_full_unstemmed |
Insects from the Upper Miocene Grubstake Formation of Alaska |
title_sort |
insects from the upper miocene grubstake formation of alaska |
publisher |
American Museum of Natural History |
publishDate |
2008 |
url |
https://doi.org/10.1206/602.1 |
op_coverage |
world |
genre |
Bering Land Bridge Seward Peninsula Alaska |
genre_facet |
Bering Land Bridge Seward Peninsula Alaska |
op_source |
https://doi.org/10.1206/602.1 |
op_relation |
doi:10.1206/602.1 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1206/602.1 |
container_title |
American Museum Novitates |
container_volume |
3612 |
container_issue |
1 |
container_start_page |
1 |
_version_ |
1800748929995767808 |