They are part of the vast array of shelled cephalopods known as ammonoids that are more closely related to squids, belemnites, octopuses, and cuttlefish, than to the superficially similar Nautilus.
[1] The Pseudohaloritide which now contains some 14 genera in three subfamilies is characterized by small, subdiscoidal to subglobular, involute shells, the surface of which may be smooth or with coarse longitudinal lirae and/or transverse ribs.
The siphuncle is retrosiphonitic, a hold-over character from the nautiloids, usually subcentral or situated within dorsal septal flexure but ventral-marginal in first and second whorls.
[1][2] The Pseudohaloritidae was established by Miller and Furnish (1957)[2] for three related genera with similar sutures and aberrant siphuncles that are removed from the ventral margin.
However no link is indicated between these Pennsylvanian and Permian forms and the Upper Devonian Clymeniids with their well established dorso-marginal siphuncles.