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Encyclopedia Britannica - Main :: PYR-RAY |
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QAAAA . Scapular arch
post
arch
Ribs two-headed ; a clavicle and interclavicle ; acetabulum closed; no obturator foramen; ambulatory; vertebrae amphicoelous. Order 7, PELYCOSAURIA. aa. No supramastoid. 1 Proc. Amer. Assoc. for the Advancement
meeting
Cambridge
2 Syllabus of Lectures on the Vertebrata (Philadelphia, 1898, 8vo), P. 54.141 Ribs two-headed; interclavicle not distinct; external digits greatly elongated to support a patagium for flight. Order 8, ORNITHOSAURIA. Ribs two-headed; no interclavicle; acetabulum open; ambulatory. Order 9, DINOSAURIA. Ribs two-headed; an interclavicle; acetabulum closed; ambulatory. Order 1o, LORICATA. Ribs one-headed; an interclavicle; acetabulum closed, a large obturator foramen; ambulatory. Order 1I, End of Article: QAAAA If you wish, you can link directly to this article.
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