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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 =
N =
North Island
S =
South Island
E =
I =
Bivalvia - Heterodonta - Veneroida - Family: Lasaeidae



Genus: Arthritica

Arthritica bifurca (Webster, 1908)
Width 6mm, Height 5mm
North, South, Stewart, Chatham and southern Islands [ACFMAnE.]
Width 5.5mm, Height 4.5mm
North Island and northern part of South Island. Living on rock boring Anchomasa [ACE.]
Arthritica hulmei Ponder, 1965
Width 3.4mm, Height 2.8mm
Wellington, Cook Strait area. Living with polychaete worm Aphrodita [CE.]

Genus: Borniola

Borniola bidentifera (Powell, 1933)
Width 1.7mm, Height 1.2mm
North Island. Far North in shell sand [AE.]
Borniola decapitata (Powell, 1939)
Width 2.8mm, Height 2mm
Stewart Island, Snares, Auckland and Chatham Islands [FMAnE.]
Borniola neozelanica Powell, 1937
Width 4.5mm, Height 3.3mm
Off Three Kings Islands, 260 metres [AME.]
Borniola powelli Crozier, 1966
Width 4.5mm, Height 4mm
Off Three Kings Islands, 135-800 metres, and off Chatham Islands, 280 metres [AME.]
Borniola profunda (Dell, 1952)
Width 1.5mm, Height 1.2mm
Tasman Sea, off west coast North Island, 536 metres [CME.]
Borniola quadrata (Dell, 1956)
Width 3.5mm, Height 2.8mm
Off Chatham Islands, trawled 230 metres [ME.]
Borniola reniformis (Suter, 1908)
Width 10mm, Height 7mm
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
South Island, Otago. In shell sand [FE.]

Genus: Kellia

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

Genus: Kellia (Kaneoha)

Width 1.4mm, Height 1.2mm
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
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
North Island east coast. Under stones in mud at high tide [ACFE.]
Lasaea parengaensis Powell, 1935
Width 1.5mm, Height 1.2mm
North Island. Parengarenga Harbour 12 metres [AE.]
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
Challenger Plateau, west of North Island, 820 metres. Chatham Rise 430-1370 metres [AME.]

Genus: Myllita (Zemyllita)

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

Genus: Myllitella

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

Genus: Mysella

Mysella alpha Powell, 1937
Width 2.2mm, Height 1.6mm
Off Three Kings Islands, 260 metres [AE.]
Mysella beta Powell, 1937
Width 3.3mm, Height 2.8mm
Off Three Kings Islands [AE.]
Mysella charcoti (Lamy, 1906)
Width 3.5mm, Height 2.5mm
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
South Island. Fiordland [FE.]
Mysella hounselli (Powell, 1931)
Width 6.3mm, Height 4.3mm
Off Northland to Queen Charlotte Sounds [ACFE.]
Mysella lachlani Dell, 1952
Width 6mm, Height 5mm
Mernoo Bank, off Lyttelton, 95 metres [CME.]
Mysella larochei Powell, 1940
Width 7.5mm, Height 5mm
Northland. In shell sand [AE.]
Mysella macquariensis (Hedley, 1916)
Width 3.3mm, Height 2.7mm
Macquarie Island [AnE.]
Mysella morioria Dell, 1952
Width 7.5mm, Height 5.5mm
Chatham Islands [ME.]
Mysella tellinula (Odhner, 1924)
Width 5.2mm, , Height 4.2mm
North Island. North Cape to Ahipara [AE.]
Mysella unidentata (Odhner, 1924)
Width 3.3mm, Height 2.6mm
South Island. Stewart, Chathams, Antipodes, Auckland, Bounty, Campbell and Snares Islands [FMAnE.]

Genus: Tellimya

Length 3.6mm, Height 2.5mm
Off Chatham Islands, 600 metres [ME.]
Tellimya reinga Crozier, 1966
Length 12mm, Height 6mm
Off Three Kings Islands, 800 metres [AE.]
Width 5mm, Height 3.1mm
Off Three Kings Islands and off Northland East Coast [AE.]