Dinosauria

Welcome to dinosauria.ucoz.com!
Here you will find the information on dinosaurs and other reptiles!
The registered user will get access to scientific publications (section "Files Archive")!

Main » 2008 » July » 17 » Albertonykus borealis, a new alvarezsaur (Theropoda) from the Early Maast. of Alberta: systematics and ecology of the Alvarezsauridae
Albertonykus borealis, a new alvarezsaur (Theropoda) from the Early Maast. of Alberta: systematics and ecology of the Alvarezsauridae
06:03
A new alvarezsaur, Albertonykus borealis, is described from the Lower Maastrichtian of the Horseshoe Canyon Formation, Alberta, Canada. Forelimb and hindlimb elements from at least two individuals were recovered from the Albertosaurus bonebed at Dry Island Provincial Park, along with pedal phalanges from nearby localities. Phylogenetic analysis shows that Albertonykus is the sister taxon of the Asian clade Mononykinae, consistent with the hypothesis that the alvarezsaurs originated in South America, and then dispersed to Asia via North America. The discovery of Albertonykus provides important insights into the biology of the Alvarezsauridae. As in other alvarezsaurs, the forelimbs of Albertonykus are specialized for digging, but they are too short to permit burrowing; they were most likely used to dig into insect nests. Potential prey items are evaluated in light of the fossil record of social insects. Ants were a minor part of the ecosystem during the Cretaceous, and mound-building termites do not appear until the Eocene. This leaves the possibility that Albertonykus preyed on wood-nesting termites. We tested this hypothesis by examining silicified wood from the Horseshoe Canyon Formation. It was found that this wood frequently contains borings, which resemble the galleries of dampwood termites (Termopsidae).

Skeletal proportions of Albertonykus borealis. Like the mononykines, Albertonykus is characterized by extremely reduced forelimbs. The tibia is longer than that of Mononykus and the forelimb elements are somewhat shorter, but it is unknown whether these bones come from the same individual.
Viewings: 3633 | Added: dinosauria | Rating: 0.0/0 |
All comments: 0

Добавлять комментарии могут только зарегистрированные пользователи.
[ Регистрация | Вход ]

Login

List of News

«  July 2008  »
SuMoTuWeThFrSa
  12345
6789101112
13141516171819
20212223242526
2728293031

Search

Friends

Statistics


Total online: 1
Guests: 1
Users: 0