burrowing habits, [469]

Astropectinidae, [454], [458], [459], [467], [470]

Astrophyton, [491], [501]

Astropyle, [81]

Astrorhiza, [59]

Astrorhizidaceae, [59]

Astroschema, [501];

vertebra, [481]

Astroschemidae, [501]

Astrosclera willeyana, [194], [194]