Mandarina luhuana ssp. minamijimana Chiba

Minamijima Mandarina Snail (Mandarina luhuana ssp. minamijimana)

The Minamijima Mandarina Snail was described in 2007, it is known exclusively from Holocene deposits on the island of Minamijima, Ogasawara Islands, Japan; it was originally thought to be identical with Mandarina luhuana (Sowerby) and was named as Mandarina luhuana f. A Chiba. 

The shells reach sizes of about 2.2 cm in height and up to 4.2 cm in diameter; they differ from those of the nominate race in having a higher spire, a smaller number of whorls, a relative narrower umbilicus and a thinner shell, the shells are furthermore darker in color. [1]

Many fossil specimens of this species are found in the sand dune.” [1] (see also photo below)

The species likely disappeared at the Pleistocene/Holocene border due to natural climate changes.


Photo: しんかわな – 投稿者が撮影



[1] Tadashige Habe: Fossil land snails from Minami-jima, Bonin Islands. Science Reports of the Tohoku University, Special Volume 6 (Hatai Memorial Volume): 51-53. 1973
[2] Satoshi Chiba: Taxonomic revision of the fossil land snail species of the genus Mandarina in the Ogasawara Islands. Paleontological Research 11(4): 317-329. 2007


edited: 27.02.2024