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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.
Kermadec Islands
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island
Forsterian - Otago, Fiordland and Stewart Island
Moriorian - Chatham Islands, Pitt Island
Antipodean - Subantarctic Islands of New Zealand
FW =
L =
E =
I =
Bivalvia - Heterodonta - Veneroida - Family: Lasaeidae



Genus: Arthritica

Arthritica bifurca (Webster, 1908)
Width 6mm, Height 5mm, Endemic
North and upper South Island [ACE.]
Width 5.5mm, Height 4.5mm, Endemic
North Island and northern part of South Island, living on rock boring Anchomasa [ACE.]
Arthritica hulmei Ponder, 1965
Width 3.4mm, Height 2.8mm, Endemic
Northland to Wellington, Cook Strait area, living with polychaete worm Aphrodita [ACE.]

Genus: Borniola

Borniola bidentifera (Powell, 1933)
Width 1.7mm, Height 1.2mm, Endemic
North Island. Far North in shell sand [AE.]
Borniola decapitata (Powell, 1939)
Width 2.8mm, Height 2mm, Endemic
Fiordland, Stewart Island, Snares, Auckland, Campbell, Bounty and Chatham Islands [FMAnE.]
Borniola neozelanica Powell, 1937
Width 4.5mm, Height 3.3mm, Endemic
Off Three Kings Islands, 260 metres [AME.]
Borniola powelli Crozier, 1966
Width 4.5mm, Height 4mm, Endemic
Off Three Kings Islands, 135-800 metres, and off Chatham Islands, 280 metres [AME.]
Borniola profunda (Dell, 1952)
Width 1.5mm, Height 1.2mm, Endemic
Tasman Sea, off west coast North Island, 536 metres [CME.]
Borniola quadrata (Dell, 1956)
Width 3.5mm, Height 2.8mm, Endemic
Off Auckland Islands, Chatham Islands and off west coast South Island [FMAnE.]
Borniola reniformis (Suter, 1908)
Width 10mm, Height 7mm, Endemic
North, South, Stewart, Chatham and Snares Islands. From low tide to over 180 metres [ACFMAnE.]
Borniola taieriensis (Powell, 1939)
Width 2.5mm, Height 2.2mm, Endemic
South Island, Fiordland to Stewart Island and Chatham Islands [FME.]

Genus: Kellia

Kellia cycladiformis (Deshayes, 1834)
Width 16mm, Height 13mm, Endemic
North, South, Stewart, Chatham and southern Islands. Often found inside empty bivalves [ACFMAnE.]

Genus: Kellia (Kaneoha)

Width 1.4mm, Height 1.2mm, Endemic
North, South and Stewart Island. On algae at low tide to over 60 metres [ACFE.]

Genus: Lasaea

Lasaea hinemoa Finlay, 1928
Width 3.5mm, Height 3mm, Endemic
North, South, Stewart, Chathams, Bounty, Auckland and Campbell Islands. Mid tide in algal clumps to over 100 metres [ACFMAnE.]
Lasaea maoria (Powell, 1933)
Width 2.4mm, Height 2mm, Endemic
North and South Islands. Under stones in mud at high tide [ACFE.]
Lasaea parengaensis Powell, 1935
Width 1.5mm, Height 1.2mm, Endemic
North and South Islands [ACFE.]
Lasaea rossiana Finlay, 1928
Width 2.4mm, Height 2.1mm
Macquarie Island, on rocks between tides [An]
Lasaea sp. aff. rubra (Montague, 1803)
Kermadec Islands [K.]

Genus: Melliteryx

Melliteryx parva (Deshayes, 1856)
North, South, Stewart, Chatham, Snares and Auckland Islands. Shallow water to about 90 metres [ACFMAnE.]

Genus: Montacuta

Width 2.7mm, Height 1.9mm, Endemic
Challenger Plateau, west of North Island, 820 metres. Chatham Rise 430-1370 metres [AME.]

Genus: Myllita (Zemyllita)

Width 14mm, Height 8mm, Endemic
North and northern South Island. Attached to the under sides of stones on sand [ACE.]

Genus: Myllitella

Myllitella vivens Finlay, 1926
Width 3.3mm, Height 3mm, Endemic
Three Kings Islands to Foveaux Strait. Shallow water to about 95 metres [ACFME.]
Width 4.3mm, Height 4mm, Endemic
Chatham Islands, common in beach drift [ME.]

Genus: Mysella

Mysella alpha Powell, 1937
Width 2.2mm, Height 1.6mm, Endemic
Off Three Kings Islands, North Cape and East Cape [AE.]
Mysella beta Powell, 1937
Width 3.3mm, Height 2.8mm, Endemic
Off Three Kings Islands, off Cook Strait and Kermadec Islands [K.ACE.]
Mysella charcoti (Lamy, 1906)
Width 3.5mm, Height 2.5mm, Endemic
Macquarie Islands. Also South Georgia, South Shetland Islands, South Orkney Islands, Palmer Archipelago and Kerguelen Islands [AnE.]
Mysella henryi Fleming, 1948
Width 3.8mm, Height 3mm, Endemic
South Island. Fiordland [FE.]
Mysella hounselli (Powell, 1931)
Width 6.3mm, Height 4.3mm, Endemic
Off Northland to Stewart Island, and the Chatham Islands [ACFME.]
Mysella lachlani Dell, 1952
Width 6mm, Height 5mm, Endemic
Mernoo Bank, off Lyttelton, 95 metres [CME.]
Mysella larochei Powell, 1940
Width 7.5mm, Height 5mm, Endemic
Northland to Stewart Island. In shell sand [ACFE.]
Mysella macquariensis (Hedley, 1916)
Width 3.3mm, Height 2.7mm, Endemic
Macquarie Island [AnE.]
Mysella morioria Dell, 1952
Width 7.5mm, Height 5.5mm, Endemic
Chatham Islands [ME.]
Mysella tellinula (Odhner, 1924)
Width 5.2mm, , Height 4.2mm, Endemic
North Island. North Cape to Ahipara [AE.]
Mysella unidentata (Odhner, 1924)
Width 3.3mm, Height 2.6mm, Endemic
South Island. Stewart, Chathams, Antipodes, Auckland, Bounty, Campbell and Snares Islands [FMAnE.]

Genus: Tellimya

Tellimya aupouria (Ponder, 1968)
Width 5mm, Height 3.1mm, Endemic
Off Three Kings Islands and off Northland East Coast [AE.]
Length 3.6mm, Height 2.5mm, Endemic
Off Chatham Islands, 600 metres, also off Bay of Plenty and South Island [ME.]
Tellimya reinga Crozier, 1966
Length 12mm, Height 6mm, Endemic
Off Three Kings Islands, 800 metres [AE.]