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Liardetia discordiae

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General Information

GLOBAL DISTRIBUTION: NATIVE Southeast Polynesia (Cooks, Australs, Societies, Makatea, Marquesas)

COOK ISLANDS STATUS: Native, Endemic of se.Polynesia; S.Group only (widespread - location on Rarotonga unknown but found at 300ft on Mo‘orea); Land, makatea and low inland; cryptogenic, under rotting wood and decaying leaves

KEY FEATURES: Spiralled hemispherical shell, 4.0x2.5mm(Ø xH). SHELL light horn, highly polished; outer whorl obtusely angled (especially in young); columella inturned obscuring 65% of superficial perforation (15x in shell Ø). ANIMAL whitish; dusky head head and tentacles.

Enlarged Image of 'Liardetia discordiae'

Cook Islands Distribution

View Distribution Map

Southern Group: Present Makatea: Present
RR	MG	AT	MK	MT	AK	PL	TK	MN
P	P	P	P		P	-	-	-

Northern Group: -
TN	MH	RK	PK	NS	SW
-	-	-	-	-	-

Key to Symbols

blank	no data
-	absent	L	localised
X	extinct 'naturally'	W	widespread
XQi	quarantine intercepted	R	recent
XQe	eradicated	?	query preceding category
P	present	T?	taxonomic query
S	seasonal	nn	present, said to have no name
O	occasional	?1	present, name not investigated
++++	very common	?2	presence not verified, no name recorded
+++	common	N/A	absent, name not expected
++	uncommon
+	rare
Cook Islands islands: RR =Rarotonga, MG = Mangaia, AT =‘Ātiu, MK=Ma‘uke, MT=Miti‘āro, AK=Aitutaki, PL=Palmerston, PN=Penrhyn, MN=Manuae, TK=Takūtea, TN=Tongareva (TS=Tongaleva Spoken, TW=Tongareva Written, they say "el" but write "r"), MH=Manihiki, RK=Rakahanga, PK=Pukapuka, NS=Nassau, SW=Suwarrow. After a Polynesian name: ^=orthography query. Countries and other: FIJ=Fiji, WT=Wallis & Futuna, SAM=Samoa, TON=Tonga, NIU=Niue, CK=Cook Islands, CKM=Cook Islands Māori, FP=French Polynesia, AUS=Australs, SOC=Societies, TAH=Tahiti, TUA=Tuamotus, MQS=Marquesas, MNG=Mangareva, PIT=Pitcain group, EAS=Easter Island, HAW=Hawai‘i, NZ=New Zealand, NZM=New Zealand Māori

Scientific Taxonomy

Liardetia discordiae (Garrett, 1881)
SYNONYMS: Microcystis discoidiae Garrett, 1881; Microcystis discoidice Garrett, 1881, misspelling; Liardetia (Oceanesia) discordiae Garrett, 1881; Helix calculosa Gould, 1861[mistaken]

TAXONOMY: ANIMALIA; MOLLUSCA; GASTROPODA; PULMONATA; Stylommatophora; Sigmurethra; Aulacopoda; Limacacea; HELICARIONIDAE (=Zonitoids)

Vouchers & References

Vouchers:
Rarotonga: specimen (ANSP 49176) of Garrett reported in Baker 1935 as Liardetia discoidiae, without location data; not found 2005/10, Fred Brook, status unknown. Mangaia: specimens 1881 Garrett with ID as Microcystis discoidiae in Baker 1935; specimens, 1929, P.Buck Oneroa makatea, 115ft elevation, in Baker 1935. Atiu: specimens in BPBM reported in Baker 1935 as Liardetia discoidiae, in Baker 1935. Mauke: specimens in BPBM reported in Baker 1935 as Liardetia discoidiae, in Baker 1935. Aitutaki: specimens in BPBM reported in Baker 1935 as Liardetia discoidiae, in Baker 1935.

References:
None recorded.

Data Update History (information):
zB02, zupB05b, zD02, zupD05b

Web Resources

Citation Information

McCormack, Gerald (2007) Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Online at http://cookislands.bishopmuseum.org.
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