Life posture of Schizambon. The pedicle opening is located between the apex of the pedicle valve and the shell margin.
| Linguliformea | ||
| Brachiopoda | Siphonotretida |
| Metazoa | |||
The siphonotretids are another one of the many small early lineages of inarticulate brachiopods. Both valves typically have obtuse-angle interareas and marginal apices. The pedicle opening is apical or in front of the apex of the pedicle valve (see above, right)
Characters: "Primitive thick-walled calcareous or chitinous shells with the pedicle emerging through a ventral sheath. The pedicle opening is circular, tends to be axial, and is not modified by a listrium. It may be posterior or anterior to the protegulum and may be elongate if it has migrated through the protegulum." - Twenhofel, W. H., and Shrock, R. R., Invertebrate Paleontology, 1935. McGraw- Hill Book Co., N. Y. p.287 (copyright expired)
Life posture of Schizambon. The pedicle opening is located between the apex of the pedicle valve and the shell margin.
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