Species Images
Under low tidal rock, Henderson Bay, Far North, NZ. animal 30-35mm
Under low tidal rock, Henderson Bay, Far North, NZ
. animal 30-35mm
Under low tidal rock, Henderson Bay, Far North, NZ
. animal 30-35mm
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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 =

Berthellina citrina (Rüppell & Leuckart, 1828)

Classification:Mollusca (Phylum) > Gastropoda (Class) > Heterobranchia (Subclass) > Pleurobranchomorpha (Order) > Pleurobranchoidea (Superfamily) > Pleurobranchidae (Family) > Berthellina (Genus)
Size/Grows to:Shell length 13mm
Distribution:Northland east coast, from Three Kings to East Cape. Low intertidal to approx. 60 metres
Geographical Range:[K.A]
Has a small internal shell
References and Publications:
  • Morley, M.S., Hayward, B.W. 2015: Intertidal records of 'sea slugs' (nudibranchs and allied opisthobranch gastropods) from northern North Island, New Zealand, Records of the Auckland Institute and Museum, 50 (p.65)
  • Brook, F.J., Marshall, B.A. 1998: The coastal molluscan fauna of the northern Kermadec Islands, southwest Pacific Ocean, Journal of the Royal Society of New Zealand, 28 (p.231)
  • Willan, R.C. 1983: New Zealand side-gilled sea slugs (Opisthobranchia: Notaspidea: Pleurobranchidae), Malacologia, 23(2) (p.228)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.282)

Note: Localities are approximate, and represent only some of the known localities for the species.