Brachs

Brachs - Lophophorates Brachiopods Hinge is pin-in-socket...

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Lophophorates: Brachiopods
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Hinge is pin-in-socket type Separate adductors and diductors Valves tend to stay articulated post mortem
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Brachidia – lophophore supports, diagnostic shapes Pedicle may exit in notch between valves (primitive) or from opening in pedicle valve.
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Shell – composed of two layers of low Mg calcite – outer lamellar layer and inner fibrous layer, outer layer often not preserved Shell can be impunctate (A) – without holes pseudopunctate (B) – with rods of granular calcite in fibrous layer punctate (C) – with holes penetrating both layers Shell structure is taxonomically restricted
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Brachiopod Taxonomy Class Inarticulata  Order Lingulida C-R Order Acrotretida C-R Class Articulata Order Orthida  C-P Order Strophomenida O-Tr Order Pentamerida C-D Order Spiriferida O-Jr Order Rhynchonellida O-R Order Terebratulida D-R
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Lingulida & Acrotretida
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Brachs - Lophophorates Brachiopods Hinge is pin-in-socket...

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