Full reference: J. Hall and R. P. Whitfield. 1872. Notice of two new species of fossil shells from the Potsdam sandstone of New York. Annual report of the Regents of the University of the State of New York 23:241-242
Parent taxon: Metazoa according to G. F. Webers and E. L. Yochelson 1999
See also Hall and Whitfield 1873
Sister taxa: Bilateria, Diploblastica, Homoblastica, Hyolithelminthida, Vertebrosa, Westgardia, Tetraradialomorpha, Broccoliforma, Parazoa, Dictyorhabdus, Chondroplon, Arboreomorpha, Epitheliozoa, Yunnanomedusa, Odontogriphidae, Mesozoa, Silicea, Xidazoon, Gaojiashania, Erniettomorpha, Ventogyrus, Evmiaksia, Megathrix, Tentaculitoidea, Gephyrea, Sentularia, Helanoichnus, Bomakellia, Subtilicyathus, Protolyellia, Nectocarididae, Khasaktidae, Kinzeriidae, Problematica, Kimberellomorpha, Euradiculata, Somatohelix, Yangtziramulus, Bilaterialomorpha, Pentaradialomorpha, Muricassis, Eodiorygma, Agmata, Cnidaria, Rhizostomites, Goettingenia, Porifera, Bronicella, Oligoopilionus, Petalonamae, Triradialomorpha, Hadrynichorde, Spygoria, Proarticulata, Hadryniscala, Eumetazoa, Atalotaenia, Scenellopsis, Convolutubus, Lazaichnus, Siphonoconcha, Limacites, Macrocypris kayi, Silicispongea, Trichoplax, Persimedusites, Lidaconus, Chenmengella, Yelovichnus, Deuteronectanebos, Lomosovis, Kuckaraukia
Subtaxa: Palaeacmaea discoides Palaeacmaea horizontalis Palaeacmaea magnifica Palaeacmaea postuma Palaeacmaea typica
Distribution:
• Triassic of Italy (1 collection)
• Silurian of the Czech Republic (1)
• Ordovician of Canada (1: Quebec), Estonia (3), United States (1: New York)
• Cambrian of China (1), United States (4: New York, Wisconsin)
Total: 12 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.