DSC_5254 Geoduck (Panopea zelandica) a large bivalve living 20-40cm deep in sand well below low tide, and far enough beyond the breaking waves to avoid dislodgement. Once dislodged from the sand, geoduck are helpless and cannot reburrow, unlike most other bivalves. They also do not need to close their shells completely, and their huge joined siphon tubes cannot be fully retracted. Golden Bay, North West Nelson
DSC_5240 Geoduck (Panopea zelandica) detail of joined siphon tubes extending from the sand. A large bivalve living 20-40cm deep in sand well below low tide, and far enough beyond the breaking waves to avoid dislodgement. Once dislodged, geoduck are helpless and cannot reburrow, unlike most other bivalves. They do not need to close their shells completely. Golden Bay, North West Nelson
DSC_7656 Dog's foot cockle (Powellina brookesi) a small, ridged, scaly shelled bivalve, found under boulders, ledges and algal holdfasts on semi-exposed to moderately sheltered north eastern shores. Goat Island Marine Reserve, Leigh
