Genus: Astrodon JOHNSTON, 1859
Etymology: Greek, astron, "constellation, star" and Greek, odon, "tooth": “Star
tooth.”
= Astrodonius KUHN, 1961
Etymology: Greek, astron, "constellation, star" and Greek, odon, "tooth": “Star
tooth.”
= Astrodontonius STEEL, 1970 (sic)
= Astrond DONG, 1990 (sic)
= Astrood DONG, 1990 (sic)
= Pleurocoelus MARSH, 1888
Etymology: Greek, pleuron “rib, side” and Greek, koilos, “hollows,
concave”: “Hollow-sided (vertebrae)”.
= Plaurocoelus LANGSTON, 1974 (sic)
= Pleurocaelus SAUVAGE, 1897/8 (sic)
Species: johnstoni LEIDY, 1865
Etymology: In honor of Christopher Johnston.
= Astrodonius johnstoni (LEIDY, 1865) KUHN, 1961
Holotype: YPM 798
Locality: Muirkirk, Latchford's property, Prince George’s County, Maryland.
Note: Incorrectly stated to be from "an iron mine near Bladensburg", Swampoodle,
Prince George's County, Maryland (KRANZ, 2004)
Horizon: Arundel Formation, Potomac Group.
Biostratigraphy:
Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Material: Tooth.
Referred material:
KRANZ, 2004
Number: Not given: Fragmentary adult femur.
LULL, 1911
USNM 3333: Teeth.
FREDERICKSON, LIPKA & CIFELLI, 2018
Locality: USNM locality 41614 (Muirkirk site, Hotton Locality), Laurel Quadrangle, USGS 1:24,000, 1979, old open pit clay mine near Muirkirk now Dinosaur Park, Price Georges County, Maryland.
Horizon: Arundel Formation, Potomac Group.
Biostratigraphy:
Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Material:
USNM 497760-497774: 15 complete and partial teeth.
LANGSTON, 1974
Locality: Greenwood Canyon, Montague County, Texas.
Horizon: Middle Paluxy Church Formation, Trinity Group.
Biostratigraphy:
Age: Comanchean, Lower Cashenranchian age, Early to Middle Albian Stage, Middle Gallic subepoch, upper Early Cretaceous Epoch, Early Cretaceous.
Material:
USNM 187535: Teeth.
= Pleurocoelus nanus MARSH, 1888 (Juvenile)
Etymology: Latin, nanus, "dwarf."
= Astrodon nanus (MARSH, 1888) (Juvenile)
Holotype:USNM 2667: 2 unguals.
USNM 3372: Caudal vertebra.
USNM 4968: Dorsal vertebra.
USNM 4969: Sacral vertebra.
USNM 4970: Caudal vertebra.
USNM 5669: Left dentary.
USNM 5678: Posterior cervical vertebra.
USNM 5691: Tooth.
USNM 5692: Supra-occipital bone.
Locality: Near Muirkirk, Prince George's County, Maryland.
Horizon: Arundel Formation, Potomac Group.
Biostratigraphy:
Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Referred material:
USNM 2263: Humerus, radius, and femur.
USNM 2265: Phalanx.
USNM 2512: Distal end of a scapula.
USNM 2523: Coracoid.
USNM 2267: First metatarsal, and phalanx.
USNM 2267: Ungual phalanx.
USNM 5639: Anterior caudal.
USNM 5660: Second metatarsal.
USNM 5667: Maxilla.
USNM 5668: Alisphenoid.
USNM 5681: Metatarsal.
USNM 5372: Posterior caudal.
USNM 5452: Astragalus.
Note: Listed under Allosaurus medius in MERRILL, 1907USNM 5656: Tibia.
USNM 5657: Fibula.
USNM 5673: Ulna.
USNM 5677: Fragmentary ilium.
USNM 5700: Anterior cervical.
CARPENTER & TIDWELL, 2005
USNM 2264, 6101: Centra.
USNM 2266, 5643, 5644, 5650, 5651, 5662-5665, 5680, 5682, 5683, 5694, 5702, 7290-7293, 7300-7303, 7319, 8442, 8455, 8476-8498, 8501, 8506, 357045, 357069, 357084: Caudal centra.
USNM 5640, 5641, 6094, 6112: Cervical centra.
USNM 5642, 5653, 5654, 5661, 5690, 6119, 7294, 7296, 8514: Indeterminate phalanges.
USNM 5646, 5648, 5658, 5659, 5689, 5698: Metacarpals.
USNM 5649: Proximal end of a metacarpal.
USNM 5660, 5687, 6093, 6119, 6120: Metatarsals.
USNM 5666, 8475: Sacral centra.
USNM 5670: Fragment of pterygoid.
USNM 5672, 6117: Sacral ribs.
USNM 5673, 5674: Proximal end of ulnae.
USNM 5675, 5705, 6092, 6097, 6103, 8499, 8500: Dorsal centra.
USNM 5676: Fibula.
USNM 5677, 8474: Fragmentary scapulae.
USNM 5679, 8509: Rib fragments.
USNM 5686, 5695: Fragmentary metacarpals.
USNM 5688: Laterosphenoid.
USNM 5696: Fragmentary femur.
USNM 5697, 6098: Fragmentary humerii.
USNM 6095: Ischium?
USNM 6096, 8473: Fragmentary coracoids.
USNM 6102: Rib.
USNM 6104: Fragmentary dentary.
USNM 6105, 6106, 8443, 8548, 8460-8464, 8466-8470, 8472, 8416, 357080, 357085, 435228, 437986, 438042, 442452, 481088: Teeth.
USNM 6110: Dorsal neural spine.
USNM 6111, 357060: Neural archs.
USNM 6112, 452029: Distal end of femora.
USNM 6113: Proximal end of a fibula.
USNM 6114: Distal end of a tibia.
USNM 6118, 357094: Fragmentary ischiums.
USNM 6121: Proximal end of a tibia.
USNM 8457, 8459, 8465, 8471: Fragmentary teeth.
USNM 7287, 357103: Fragmentary zygapophysis.
USNM 7288: Maxilla with tooth.
USNM 8515: Rib head.
USNM 9147, 9149: Proximal end of a radius.
USNM 9150, 9153, 357092: Distal end of ulnae.
USNM 9152: Maxillary tooth.
USNM 9155: Distal end of a metatarsal.
USNM 16710: Femur.
USNM 357039, 357060: Neural arch fragments.
USNM 357042, 357049: Indeterminate fragmentary phalanges.
USNM 357044: Fragmentary vertebra.
USNM 357051, 357083, 357100, 357101: Fragmentary centra.
USNM 357052: Angular fragment.
USNM 357066: Fragmentary humerus?
USNM 257075: Sternal plate.
USNM 357091: Maxilla.
USNM 357093: Distal end of a scapula.
USNM 357096: Caudal neural arch.
USNM 357105, 357106: Proximal end of humerii.
USNM 357107: Ischium and tibia.
= Pleurocoelus altus MARSH, 1888 (Adult)
Etymology: Latin, altus, "high."
= Astrodon altus (MARSH, 1888) (Adult)Holotype: USNM 4971
Locality: Near Muirkirk, Prince George's County, Maryland.
Horizon: Arundel Formation, Potomac Group.
Biostratigraphy:
Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.
Material: Tibia and distal and proximal ends of a fibula.
Referred material:
LULL, 1911
USNM 5010: Rib.
USNM 5626: Mid Caudal vertebra.
USNM 5687: Metatarsal.