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THE BASAL METAZOANS: SPONGES AND CORALS 273
66°N
30°N
0°
Mountains Land Continental shelf Reefs
Figure 11.13 Paleogeographic range of Early Cambrian archaeocyathid reefs. (Replotted from
Debrenne 2007.)
REGULARES IRREGULARES
M
M
Erbocyathoidea Syringocnemidina
Erismacoscinina
Kazachsetanicyathida
M
M
Ajacicyathida M
Archaeocyathida
M
Dokidocyathina
M
Monocyathida
Figure 11.14 Evolutionary trends within the archaeocyaths; modular forms, appearing iteratively, are
indicated by M. (Based on Wood et al. 1992.)
