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Interest in the life history of Troodon continued in the 1990s with a study of its growth rates based on histological sections of fossils taken from a bonebed in Montana [4] and the apparent pairing of eggs in Troodon nests. [5] This decade also saw the first potential report of European troodontid remains, although this claim has been ...
Troodontidae / t r oʊ. ə ˈ d ɒ n t ɪ d iː / is a clade of bird-like theropod dinosaurs from the Late Jurassic to Late Cretaceous. During most of the 20th century, troodontid fossils were few and incomplete and they have therefore been allied, at various times, with many dinosaurian lineages.
It was proposed that derived troodontids had convergently evolved dromaeosaurid-style large second pedal unguals, likely as an adaptation relating to predation. The authors noted that it is plausible that this may be applicable to other derived troodontids, including Troodon , although this is currently uncertain due to a paucity of sufficient ...
Europe is relatively rich in fossils from the Jurassic-Cretaceous boundary, and much of what is known about European dinosaurs dates from this time. During the Maastrichtian the end of the Cretaceous dinosaurs were dominating western and Central Europe as the Tremp Formation in Spain dates back to that age.
Troodontidae continued to diversify and can be found in Asia, Europe and North America. [29] [4] [7] [25] [28] They were most probably dispersed from Asia to other continents on land. [7] Around the same time, Avialae began to obtain the ability to fly. [30] This may contribute to the rapid diversification and dispersal of avialans in later ...
Jinfengopterygines were relatively small sized troodontids ranging from about 0.5–2 m (1.8–6.6 ft), [1] [2] and like other troodontids had a pair of sickle claws on each foot. These animals were feathered, as most troodontids presumably were, as shown in the type species, with typical feathering around the body an neck and especially long ...
It is one of the oldest known dromaeosaurs in the world, and the first known uncontested dromaeosaur from the Early Cretaceous of Europe. It is known from two teeth, the first of which was found in 2000 and the second in 2008. Based on the first tooth (the holotype), the genus and species Dromaeosauroides bornholmensis was named in 2003.
In their phylogenetic analyses, Lee et al. (2024) recovered Harenadraco, along with an unnamed specimen from the Wulansuhai Formation, as the earliest diverging members of an otherwise entirely Chinese clade of troodontids. This clade is the sister taxon to all other troodontids.