Dentalium

Belongs within: Scaphopoda. Dentalium is a cosmopolitan genus of tusk shells known from the Middle Triassic to the present day. In members of the type subgenus, the shell is prismatic or strongly ribbed, with a polygonal cross-section toward the apex. The subgenus Antalis is less strongly ribbed than Dentalium sensu stricto, without a polygonal cross-section… Continue reading Dentalium

Scaphopoda

Belongs within: Rostroconchia.Contains: Gadilimorpha, Laevidentaliidae, Dentalium. The Scaphopoda, tusk shells, are a group of benthic molluscs with a tubular shell that live buried in the sediment, feeding on micro-organisms. In members of the Dentaliida, the shell generally tapers evenly whereas Gadilida commonly have the shell constricted toward the mouth (Ludbrook 1960). Two pairs of dorsoventral… Continue reading Scaphopoda

Rostroconchia

Belongs within: Mollusca.Contains: Conocardioida, Scaphopoda. The Rostroconchia are a group of molluscs known from the Cambrian to Late Permian. They possess a pseudobivalved shell, with the valves joined by an anterior partition called the pegma that in life also provided the attachment site for the pedal retractor muscles; a posterior pegma may also be present… Continue reading Rostroconchia