Ameisenfossilien aus Montana

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Ameisenfossilien aus Montana

Beitragvon Merkur » Samstag 9. Januar 2016, 17:23

JS LaPolla, DE Greenwalt (2015): Fossil Ants (Hymenoptera: Formicidae) of the Middle Eocene Kishenehn Formation.- Sociobiology 62 163-174.
http://periodicos.uefs.br/ojs/index.php ... ew/717/671
Abstract
A broad range of interesting fossil insects have been discovered recently in Kishenehn
Formation shale (middle Eocene, ca. 46 myo) in northwestern Montana, among
them a diversity of ant species. Two hundred forty-nine ant fossils were examined
in this study, with 152 them assignable at least to subfamily. Here, twelve fossil
ant species are formally described. These include a new genus of Dolichoderinae
(Ktunaxia, gen. nov.), and the oldest known species from two extant genera:
Crematogaster (C. aurora, sp. nov.) and Pseudomyrmex (P. saxulum, sp. nov.). The
Eocene is of particular interest for understanding ant evolution because it is during
this period that many present-day speciose and ecologically dominant clades of ants
apparently emerged. In order to understand the evolution of ants, and in particular
their march to the terrestrial dominance observed in modern times, it is critical to
understand the tempo of ant diversity during the Eocene. The Kishenehn provides
another window into Eocene ant diversity; its relevance to some of the other major
Eocene ant fossil deposits is discussed.

Mit interessanten Abbildungen!

Die fossilen Ameisen aus Montana stammen aus dem Mittleren Eozän, vor ca. 46 Mio Jahren, so wie die aus der Grube Messel bei Darmstadt (ca. 47 Mio Jahre alt), mit der „riesigen“ Titanomyrma gigantea: https://en.wikipedia.org/wiki/Titanomyrma

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