Online Encyclopedia

AAAA

Online Encyclopedia
Originally appearing in Volume V23, Page 141 of the 1911 Encyclopedia Britannica.
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AAAA. Scapular arch external to ribs; one longitudinal post-orbital bar (Synaptosauria). A supramastoid and paroccipital bones; ribs two-headed on centrum; carpals and tarsals not distinct in form from metapodials; vertebrae amphicoelous. Order 4, ICHTHYOPTERYGIA. A supramastoid; paroccipital not distinct; a postorbitosquamosal arch; ribs two-headed; a clavicle; obturator foramen small or none; vertebrae amphicoelous. Order 5, THEROMORA. No supramastoid; paroccipital not distinct.; a quadratougal arch; scapula triradiate; no clavicle; ribs oneeaded. Order 6, PLESIOSAURIA.
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ANDREW AAGESEN (1826-1879)

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