Riedel, 1967, emend. Foreman, 1973
Spherical or subspherical cephalis, usually with an apical tube directed obliquely upwards (undivided cephalis 2 Botryostrobus auritus/australis). The pores on all postcephalic segments, or at least on the last ones, are arranged in clearly defined transverse rows (pore arrangement upper-left panel). Usually elongated, multisegmented forms.
The following species of this family are treated in the present volume:
Botryostrobus aquilonaris
Botryostrobus auritus/australis
Phormostichoartus corbula
Siphocampe arachnea
Siphocampe lineata
Spirocyrtis scalaris
Tricolocampe cylindrica