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, 1907

USNM 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.