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Cnidaria. Hydrozoans – “fire corals” Scyphozoans – “jelly fish” Anthozoans – “corals and sea anemones. Cnidarian Physiology. Phylum Cnidaria Class Hydrozoa Late Cret – R Class Scyphozoa PCamb – R Class Anthozoa Subclass Octocorallia PCamb – R
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Cnidaria Hydrozoans – “fire corals” Scyphozoans – “jelly fish” Anthozoans – “corals and sea anemones
Phylum Cnidaria Class Hydrozoa Late Cret – R Class Scyphozoa PCamb – R Class Anthozoa Subclass Octocorallia PCamb – R Subclass Zoantharia Order Tabulata Early Ord – Permian Order Rugosa Mid Ord – Permian Order Scleractinia Mid Triassic - R
Order Tabulata Tabulae – horiz partitions No septa Favosites Halysites – chain coral Declined after Dev.
Order Rugosa Outer wall (epitheca) is wrinkled “horn corals”, “tetracorals” Add disseptiments and septa to tabulae Have 4-fold symmetry to septa Colonial and solitary large
Order Scleractinia “hexacorals” Aragonite skeleton, six primary septa rugosa Hermatypic (reef) vs Ahermatypic Influenced by zooanthellae Herm’s can live in nutrient poor But must be shallow & tropical Aherm’s can be anywhere Don’t like sedimentation and turbidity scleractinea
Reefs through Time Note absence of reefs in C-O & P-Tr. Sampling or real? If real, signif. To diversity Compare to trophic tiering pattern
