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Key to Geographical Ranges
The symbols K.A.C.F.M.An. are used to indicate the geographical range of the species. They have been adopted to give an approxomation of the range of each species within New Zealand.
K=
Kermadec Islands
A=
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
C=
Cookian - Lower North Island and the northern part of the South Island
F=
Forsterian - Otago, Fiordland and Stewart Island
M=
Moriorian - Chatham Islands, Pitt Island
An=
Antipodean - Subantarctic Islands of New Zealand
FW =
Freshwater
L =
Land
E =
Endemic
I =
Introduced
Mollusca (Phylum) > Bivalvia (Class) > Pteriomorphia (Subclass) > Mytilida (Order) > Mytiloidea (Superfamily) > Mytilidae (Family) > Crenellinae (Subfamily)
Mytilidae: Crenellinae
 
Genus: Arcuatulamap >
Arcuatula senhousia Benson, 1842
Length 31mm, Height 15mm, Asian Mussel. Introduced
Worldwide. Northland, New Zealand. Clustered in dense masses in muddy harbours [A]
Genus: Gregariellamap >
Gregariella barbata (Reeve, 1858)
Length 11mm, Width 5mm
North, South and Chatham Islands. Also Western Australia to New South Wales [K.ACM]
Genus: Musculusmap >
Musculus cumingianus (Reeve, 1857)
Kermadec Islands [K.]
Musculus impactus (Hermann, 1782)
Length 45mm, Width 28mm, Nesting Mussel
North, South, Stewart and Chatham Islands. In clumps under rocks below low tide [ACFM]
Genus: Rhomboidellamap >
Rhomboidella radians (Suter, 1908)
Width 4.2mm, Height 6mm, Endemic
North Island. Three Kings Islands to Bay of Plenty [A]