Grandicrepidula collinae Marshall, 2003 Length 48mm, Width 22mm, Marine, Endemic Eastern Northland southward to the Snares. Found behind outer lip of living or dead/hermit-crab Gastropod shells, 175-590 metres ACFE.
Maoricrypta costata (G.B. Sowerby I, 1824) Length 60mm, Width 40mm, Ribbed Slipper Shell. Marine, Endemic Northland to Mahia, living intertidally to 47 metres, attached to undersides of rocks and on living Perna canaliculusACE.
Maoricrypta kopua (Marshall, 2003) Length 28mm, Marine, Endemic. Animal whitish, translucent Three Kings Islands to East Cape, 78-805 metres. Living within apertures of dead/hermit crabbed Gastropods AE.
Maoricrypta monoxyla (Lesson, 1831) Length 30mm, Width 25mm, Smooth Slipper Shell. Marine, Endemic North Cape to Cape Runaway. Yellow animal, consistently lives on the outside of shells, intertidally to about 15 metres ACE.
Maoricrypta sodalis Marshall, 2003 (=monoxyla of authors not Lesson, in part) Length 37mm, Width 20mm, Marine, Endemic. White animal. Typically found within apertures of dead gastropods North, South, Stewart, and Snares Islands, intertidally to 925 metres ACFE.
Maoricrypta youngi Powell, 1940 (=profunda Beu & Maxwell not Hutton) Length 27mm, Width 22mm, Height 8mm, Marine, Endemic North Cape to Cook Strait, living on Gastropods, at low tide to 88 metres ACE.
Sigapatella novaezelandiae (Lesson, 1831) Length 42mm, Height 25mm, Circular Slipper Shell. Marine, Endemic North, South, Stewart, Chatham, Auckland, Snares and Campbell Islands. Living intertidally to 200 metres, attached to hard substrate ACFMAnE.
Sigapatella spadicea Boshier, 1961 Length 21mm, Width 18mm, Marine, Endemic. Spinose surface periostracum/epidermis North, South and Stewart Island. 4-533 metres attached to hard substrate/shells ACFE.
Sigapatella superstes Fleming, 1958 Width 28mm, Height 12mm, Marine, Endemic. Granulose surface pattern Off Three Kings Islands and off Northern tip of North Island. (1 juvenile off Aldermen Islands), 0-805 metres AE.
Sigapatella tenuis (Gray, 1867) Width 16mm, Height 9mm, Marine, Endemic. Oblique spiral threads on the teleoconch, smooth periostracum when not worn off Three Kings, North, South, Stewart and Chatham Islands. 0-604 metres, attached to hard substrate ACFME.
Sigapatella terraenovae Peile, 1924 (=crater Finlay, =tumens Finlay) Width 30mm, Height 20mm, Marine, Endemic Off Three Kings Islands, Far North and Ranfurly Bank, East Cape. Attached to hard substrate, 27-93 metres ACE.
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.
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