MOLLUSCA — DIAGRAMS
Tap the labels to learn each part.
Shell
Layers
Torsion
Sequence
Bivalve
Shell
Periostracum
Prismatic layer
Nacreous layer
Tap a label above to learn what that shell layer does.
Head/Foot (fixed)
Mantle cavity
Stage 0: Before torsion (bilateral, symmetrical larva)
The mantle cavity and anus start at the rear, behind the visceral mass — a normal, symmetrical layout.
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Umbo
Ligament
Growth lines
Byssal threads
Adductor muscle
Tap a label above to learn about that part of the bivalve shell.