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A Paleozoic brachiopod shell partly broken to show the internal spiral arm-supports. Mississippian limestones. Note the symmetrical character of the shell with reference to a median line drawn through the apex of beak.

Brachiopod

A Paleozoic brachiopod shell partly broken to show the internal spiral arm-supports. Mississippian limestones.…

The shell of Athyris concentrica, a species of brachiopod.

Athyris Brachiopod

The shell of Athyris concentrica, a species of brachiopod.

The dorsal valve of the brachiopod Atrypa reticularis.

Atrypa Brachiopod

The dorsal valve of the brachiopod Atrypa reticularis.

The shell of Atrypa reticularis, a species of brachiopod.

Atrypa Brachiopod

The shell of Atrypa reticularis, a species of brachiopod.

A mollusk radiate from the Paleozoic time, Pentamerus oblongus, a brachiopod from the Clinton group.

Pentamerus Brachiopod

A mollusk radiate from the Paleozoic time, Pentamerus oblongus, a brachiopod from the Clinton group.

The shell of Spirifer striatus, a species of brachiopod.

Spirifer Brachiopod

The shell of Spirifer striatus, a species of brachiopod.

Interior of the dorsal valve of Spirifer striatus.

Spirifer Brachiopod

Interior of the dorsal valve of Spirifer striatus.

The interior view of the brachiopod Waldheimia flavescens.

Waldheimia Brachiopod

The interior view of the brachiopod Waldheimia flavescens.

The Lingula have tongue-shaped shells with a long fleshy stalk, or pedicle, with which the animal burrows into sandy or muddy sediments.

Lingula

The Lingula have tongue-shaped shells with a long fleshy stalk, or pedicle, with which the animal burrows…

The Lingula antigua is a little bivalve shell belonging at the bottom of the class Brachiopoda. The inarticulate brachiopod genus Lingula is the oldest, relatively unchanged animal known. The oldest lingulid fossils are found in Lower Cambrian rocks dating to roughly 550 million years ago. The origin of brachiopods is unknown. A possible ancestor is a sort of ancient "armored slug" known as Halkieria that had small brachiopod-like shields on its head and tail.

Lingula Antigua

The Lingula antigua is a little bivalve shell belonging at the bottom of the class Brachiopoda. The…

The Lingula prima is a little bivalve shell belonging at the bottom of the class Brachiopoda. The inarticulate brachiopod genus Lingula is the oldest, relatively unchanged animal known. The oldest lingulid fossils are found in Lower Cambrian rocks dating to roughly 550 million years ago. The origin of brachiopods is unknown. A possible ancestor is a sort of ancient "armored slug" known as Halkieria that had small brachiopod-like shields on its head and tail.

Lingula Prima

The Lingula prima is a little bivalve shell belonging at the bottom of the class Brachiopoda. The inarticulate…

A mollusk radiate from the Paleozoic time, Orthis varica of the Niagara group.

Orthis Mollusk

A mollusk radiate from the Paleozoic time, Orthis varica of the Niagara group.

An ancient mollusk from the Paleozoic time, Spirifer mucronatus.

Sprifer Mollusk

An ancient mollusk from the Paleozoic time, Spirifer mucronatus.

An ancient mollusk from the Carboniferous Age, the Spirifer cameratus.

Spirifer Mollusk

An ancient mollusk from the Carboniferous Age, the Spirifer cameratus.

Spirifer sowerbyi, an extinct brachiopod.

Spirifer sowerbyi

Spirifer sowerbyi, an extinct brachiopod.

A characteristic modern Brachiopod of the northern Atlantic coast.

Terebratulina Septentrionalis

A characteristic modern Brachiopod of the northern Atlantic coast.