Page 332 - Introduction to Paleobiology and The Fossil Record

SPIRALIANS 1: LOPHOPHORATES 319

Paleozoic Mesozoic Ceno. O S D C Pm Tr Jr K P N Cryptostomata Fenestrata Cyclostomata Cystoporata Trepostomata boring Ctenostomata non-boring Ctenostomata Cribri- morpha Anasca Ascophora

Gymnolaemata
Stenolaemata ~50 genera
Figure 12.17 Stratigraphic ranges and absolute abundances of the main bryozoan groups. Geological
period abbreviations are standard, running from Ordovician (O) to Neogene (N). (From Taylor, 1985.)

(b) (d) (e) (f)

(a) (c) (g) (h)
Figure 12.18 Some bryozoan genera: (a) Rhabdomeson (Carboniferous cryptostome), (b)
Rectifenestella (Carboniferous fenestrate), (c) Fistulipora (Carboniferous cystopore), (d) Penniretepora
(Carboniferous fenestrate), (e) Archimedes (Carboniferous fenestrate), (f) Archaeofenestella (Silurian
fenestrate), (g) Lunulites (Cretaceous cheilostome), (h) Castanapora (Cretaceous cheilostome).
Magnifi cation approximately ×30 (a), ×15 (b, c), ×1 (d–f), ×5 (g), ×20 (h). (a–c, courtesy of Patrick
Wyse Jackson; d–h, from Taylor 1985.)