岩礁潮间带
Tide pools and rocks exposed at low tide, carpeted with mussels and home to seastars, greenlings and wakame.
Shell length usually 10–20 cm, irregular
Shell length 6–8 cm
Shell length up to 14 cm
Shell length over 10 cm
Mantle length about 5–8 cm
Carapace width about 8–9 cm
Body length over 20 cm
Test diameter up to 8–10 cm
Arm length over 10 cm
Body length over 30 cm
Body length 30–50 cm
Body length usually 20–40 cm
1–2 m long
Blade 10–30 cm long
Blade 10–30 cm wide
Observations here