EARLY PALEOZOIC LIFEMetazoan Invertebrates

Tabulata (Tabulate Corals)

Ranged from Ordovician to Permian

Major reef formers, Silurian and Devonian reefs

Always colonial

Tabulae, no septa

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Tabulata (Tabulate Corals)

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Tabulata (Tabulate Corals)

Favosites

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Tabulata (Tabulate Corals)

Halysites

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Bryozoa (Moss animals)

Ranged from Ordovician to Recent

Major reef formers, Silurian and Devonian reefs

Colonial

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Bryozoa (Moss animals)

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Bryozoa (Moss animals)

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Bryozoa (Moss animals)

Bryozoa

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Bryozoa (Moss animals)

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Brachiopoda (Lamp shells)

Adundant, diverse and useful

Cambrian to Recentmost abundant in the Paleozoic

Inarticulatesmost abundant in Cambrian to Silurian

Articulatesmost abundant in Ordovician to Permian

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Brachiopods (Lamp shells)

Lophophore

Pedical Valve

Brachial Valve

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Brachiopods Symmetry

Pedical Valve

Brachial Valve

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Articulate Brachiopods

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Articulate Brachiopods

Hinge at posterior of valves

Teeth and sockets

May have a pedicle

Shells are usually CaCO3 or can be phosphatic

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Articulate Brachiopods

Strophomenids, orthids, pentamerids andrhynconellids most common in early Paleozoic

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Inarticulate Brachiopods

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Inarticulate Brachiopods

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Inarticulate Brachiopods

Muscles hold valves together

Long pedicle

Shells are usually phosphatic

EARLY PALEOZOIC LIFEMetazoan 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 LIFEMetazoan Invertebrates

Mollusca

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Mollusca

BivalvesShell 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 LIFEMetazoan Invertebrates

Mollusca

CephalopodsShell reduced or lost Rapid movement permits predation: •complex eye•complex brain, nervous system•advanced circulation (3 hearts)

Late Cambrian to Recent

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Mollusca Cephalopods

EARLY PALEOZOIC LIFEMetazoan Invertebrates

Mollusca

Cephalopods

ChamberedNautilus