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. 2014 Jun 3;2:e422. doi: 10.7717/peerj.422

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© 2014 Woodward et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Primary osteons (examples in dashed outlines) are embedded within a woven tissue matrix in (A) the ulna of MOR-OST 1648, (B) the tibia of MOR-OST 1650, (C) the humerus of MOR-OST 1648, (D) the tibia of MOR-OST 1648, (E) the fibula of MOR-OST 1648, and (F) the tibia of the non-avian dinosaur Maiasaura (MOR 005 T11-3) for comparison. The primary osteons of the alligators have fewer lamellae and are more acellular than those from the Maiasaura. Simple primary canals (examples indicated by arrows) are scattered amongst the primary osteons in the alligator tissue but are not present in the Maiasaura section. Scale bars, 100 µm.