Checked content

File:Pachycephalosaurus ontogeny.png

English: Cranial ontogenetic sequence of Pachycephalosaurus wyomingensis with morphological landmarks highlighted in colour. Scale bar = 5 cm. The ontogenetically oldest adult, AMNH 1696, in (A) dorsal and (B) right lateral views. A younger adult, UCMP 556078 (cast) with inflation of the frontoparietal dome+lateral cranial elements and mature nasal and squamosal nodal ornamentation in (C) dorsal and (D) right lateral views. MPM 8111, a partial skull of "Stygimoloch" in (E) dorsal and (F) left lateral views (reversed) illustrates the high narrow frontoparietal dome, squamosal nodes and horns characteristic of the subadult growth stage. Landmarks on the dorsal skull of MPM 8111 in orange (anterior) and red (posterior) constrain the position of the dome. The youngest growth stage in this cranial ontogenetic series is "Dracorex", TCNI 2004.17.1 (cast) in (G) dorsal and (H) right lateral views. The position of the squamosal horns and nasal nodes are consistent in these four pachycephalosaurid skulls, which increase in overall length and size from youngest (G,H) to oldest (A,B).
Polski: Sekwencja zmian ontogenetycznych czaszki Pachycephalosaurus wyomingensis. Pasek skali = 5 cm.
Date 27 October 2009
Source Horner JR, Goodwin MB (2009) Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus. PLoS ONE 4(10): e7626. doi: 10.1371/journal.pone.0007626.g003
Author John R. Horner, Mark B. Goodwin
( Reusing this file)
w:en:Creative Commons
This file is licensed under the Creative Commons Attribution 2.5 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).

The following pages on Schools Wikipedia link to this image (list may be incomplete):

Find out more

Through Schools Wikipedia, SOS Children's Villages has brought learning to children around the world. More than 2 million people benefit from the global charity work of SOS Children, and our work in 133 countries around the world is vital to ensuring a better future for vulnerable children. Have you heard about child sponsorship? Visit our web site to find out.