EARLY PALEOZOIC LIFE Metazoan Invertebrates Tabulata Tabulate Corals

EARLY PALEOZOIC LIFE Metazoan Invertebrates Tabulata (Tabulate Corals) Ranged from Ordovician to Permian Major reef formers, Silurian and Devonian reefs Always colonial Tabulae, no septa

EARLY PALEOZOIC LIFE Metazoan Invertebrates Tabulata (Tabulate Corals)

EARLY PALEOZOIC LIFE Metazoan Invertebrates Tabulata (Tabulate Corals) Favosites

EARLY PALEOZOIC LIFE Metazoan Invertebrates Tabulata (Tabulate Corals) Halysites

EARLY PALEOZOIC LIFE Metazoan Invertebrates Bryozoa (Moss animals) Ranged from Ordovician to Recent Major reef formers, Silurian and Devonian reefs Colonial

EARLY PALEOZOIC LIFE Metazoan Invertebrates Bryozoa (Moss animals)

EARLY PALEOZOIC LIFE Metazoan Invertebrates Bryozoa (Moss animals)

EARLY PALEOZOIC LIFE Metazoan Invertebrates Bryozoa (Moss animals) Bryozoa

EARLY PALEOZOIC LIFE Metazoan Invertebrates Bryozoa (Moss animals)

EARLY PALEOZOIC LIFE Metazoan Invertebrates Brachiopoda (Lamp shells) Adundant, diverse and useful Cambrian to Recent most abundant in the Paleozoic Inarticulates most abundant in Cambrian to Silurian Articulates most abundant in Ordovician to Permian

EARLY PALEOZOIC LIFE Metazoan Invertebrates Brachiopods (Lamp shells) Brachial Valve Lophophore Pedical Valve

EARLY PALEOZOIC LIFE Metazoan Invertebrates Brachiopods Symmetry Pedical Valve Brachial Valve

EARLY PALEOZOIC LIFE Metazoan Invertebrates Articulate Brachiopods

EARLY PALEOZOIC LIFE Metazoan Invertebrates Articulate Brachiopods Hinge at posterior of valves Teeth and sockets May have a pedicle Shells are usually Ca. CO 3 or can be phosphatic

EARLY PALEOZOIC LIFE Metazoan Invertebrates Articulate Brachiopods Strophomenids, orthids, pentamerids and rhynconellids most common in early Paleozoic

EARLY PALEOZOIC LIFE Metazoan Invertebrates Inarticulate Brachiopods

EARLY PALEOZOIC LIFE Metazoan Invertebrates Inarticulate Brachiopods

EARLY PALEOZOIC LIFE Metazoan Invertebrates Inarticulate Brachiopods Muscles hold valves together Long pedicle Shells are usually phosphatic

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Basic mollusc body plan changed over time to produce today's main classes of molluscs. Mantle tissue produces shell which protects visceral organs. Posterior mantle cavity houses gills which obtain oxygen from water passing into cavity. Head contains tentacles, eyes, brain, and radula (rasping "tongue") Viscera houses internal organs: heart, guts, kidney, gonads Foot is muscular, for movement

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Bivalves Shell elaborates into 2 "valves" with connecting ligament Head and radula disappear: Sensory role of head taken over by mantle (eyes, tentacles develop there) Feeding role of radula taken over by enlarged gills, leading to "filter feeding" Early Cambrian to Holocene

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods Shell reduced or lost Rapid movement permits predation: • complex eye • complex brain, nervous system • advanced circulation (3 hearts) Late Cambrian to Recent

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods

EARLY PALEOZOIC LIFE Metazoan Invertebrates Mollusca Cephalopods Chambered Nautilus