Synonyms: Hyposaurus ferox Marsh 1871, Hyposaurus natator Troxell 1925, Hyposaurus natator oweni Troxell 1925
- Hyposaurus rogersii: Its type locality is Big Timber Creek, Stratford, which is in a Danian marine sandstone in the Hornerstown Formation of New Jersey
- Hyposaurus ferox: YPM 2794, a set of teeth (2 teeth). Its type locality is Pemberton Marl Company pit (Hornerstown), which is in a Maastrichtian marginal marine marl in the Hornerstown Formation of New Jersey.
- Hyposaurus natator: YPM 985, a partial skeleton (Skull and jaws, pelvis, shoulder, 33 vertebrae and rib fragments). Its type locality is Cream Ridge Marl Company pit (Hornerstbown Fm.), which is in a Maastrichtian marginal marine marl in the Hornerstown Formation of New Jersey.
- Hyposaurus natator oweni: YPM 753, a partial skeleton (Mandible, several dorso-lumbar vertebrae, complete right pelvis, a few caudals, and some limb elements).
Total: 8 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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