Alternative combinations: Arca hornii, Halonanus horni, Halonanus hornii, Pachecoa (Pachecoa) hornii, Trigonodesma hornii
Full reference: W. M. Gabb. 1864. Description of the Cretaceous fossils. Geological Survey of California Palaeontology 1:57-217
Belongs to Pachecoa according to A. J. W. Hendy 2020
See also Gabb 1864, Hanna 1927, Moore 1983, Nilsen 1987, Reinhart 1943, Stewart 1930 and Vokes 1939
Sister taxa: Pachecoa (Pachecoa), Pachecoa (Stenzelia), Pachecoa decisa, Pachecoa declivis, Pachecoa ellipsis, Pachecoa pulcra, Pachecoa sabinica
Subtaxa: Halonanus hornii hornii Pachecoa (Pachecoa) hornii elusa
Type specimen: Its type locality is UCMP 3578, east of Marsh Creek, which is in a Ypresian coastal sandstone in the Meganos Formation of California
Distribution:
• Eocene of United States (19: California, Oregon collections)
Total: 19 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.