Hirasea acutissima
Encyclopedia
Hirasea acutissima is a species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of small air-breathing land snail
Snail
Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

, a terrestrial
Terrestrial animal
Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 pulmonate gastropod mollusk in the family Endodontidae
Endodontidae
Endodontidae is a taxonomic family of very small air-breathing land snails and slugs, terrestrial pulmonate gastropod mollusks in the superfamily Punctoidea....

.

Hirasea acutissima was endemic to Haha-jima
Haha-jima
is the second-largest island of the Ogasawara Islands or Bonin Islands south of the Japanese main island chain. It is about 21 km² in area.The highest points are Mt. Chibusa , approximately 462m, and Mt. Sakaigatake , 443m. The largest island of the group, Chichi-jima is approximately...

 in the Ogasawara Islands
Ogasawara Islands
The Bonin Islands, known in Japan as the are an archipelago of over 30 subtropical and tropical islands, some directly south of Tokyo, Japan. Administratively, they are part of Ogasawara Municipality of Ogasawara Subprefecture, Tokyo...

, Japan.

Hirasea acutissima is listed as endangered in the IUCN Red List of Threatened Species.

Hirasea acutissima species is considered to be extinct by Chiba et al. (2007).
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