page_title: Ostromia
section_title: Differences from Archaeopteryx
hierarchical_section_title: Ostromia / Description / Differences from Archaeopteryx
caption_attribution_description: English: Ostromia reconstruction, previously known as the Haarlem Archaeopteryx specimen
context_page_description: Ostromia is a genus of anchiornithid theropod dinosaur from the Late Jurassic Painten Formation of Germany. The genus contains a single species, O. crassipes, named by Christian Foth and Oliver Rauhut in 2017.
context_section_description: The Haarlem specimen has many features which contrast with those of Archaeopteryx. The length ratio between the third and the first metacarpal of the hand is larger in Ostromia than in any Archaeopteryx specimen. In addition, the ungual (claw) of the first digit of the hand is smaller than the corresponding first metacarpal, while in Archaeopteryx the claw is larger. The Haarlem specimen's metatarsals are also estimated to be proportionally longer than those of Archaeopteryx specimens.
  In addition, the Haarlem specimen shares several features with Anchiornis. Most notably, they both have longitudinal furrows on the top and bottom sides of their manual phalanges (finger bones). While such structures can be a result of collapsed or broken bones (as is the case in several Archaeopteryx specimens), the straight, smooth edges of the furrows in Ostromia and Anchiornis indicate that they are legitimate biological features. The pubic shaft of the Haarlem specimen is also strongly flexed backwards and has a triangular pubic boot, similar to the pubis of Anchiornis but unlike that of Archaeopteryx.
caption: Restoration
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