| Ogasawarana yoshiwarana | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Neritimorpha |
| Order: | Cycloneritida |
| Family: | Helicinidae |
| Genus: | Ogasawarana |
| Species: | O. yoshiwarana |
| Binomial name | |
| Ogasawarana yoshiwarana | |
| Synonyms | |
Helicina yoshiwarana Pilsbry, 1902 [2] | |
Ogasawarana yoshiwarana is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids.
Ogasawarana yoshiwarana was originally described under the name Helicina yoshiwarana by American malacologist Henry Augustus Pilsbry in 1902. [2]
Pilsbry's original text (the type description) appeared in the key and it reads as follows:
Periphery more or less angular, or rounded though compressed. Surface delicately striate spirally. Alt. 3.5, diam. 5.3 to 5.8 mm.
Pilsbry also distinguished two variants:
This species was endemic to Haha-jima in the Ogasawara Islands (Japan).
Ogasawarana yoshiwarana has been recorded living (as recently as 2006) [3] on Higashizaki peninsula off the eastern coast of Hahajima, the second largest island in the Ogasawara Archipelago/Bonin Islands system. The Bonin Islands have been sometimes referred to as the Galapagos Islands of the Orient, due to their highly diverse fauna and flora. [4] The island is small and only partly covered by forest, which is where this terrestrial gastropod lives.
This animal is essentially an herbivore, eating leaves, stems, soft bark, fruit, vegetables, fungi and algae. Its behavior is like that of any other land snail: it thrives in damp and wet weather. This is especially true of the ogasawarana yoshiwarana because it lives in a subtropical/tropical environment. Predators of the species include predatory snails, ground beetles, leeches, and parasites.
Estimates of the population of this species haven't been conducted. They are expected to be found exclusively in this archipelago, not far from its endemic origin of Hahajima island. It is currently unknown why its population is sparse or even if it is declining or increasing in size. Habitat loss is not a factor; in fact, its home is one of the few places in the world not affected by anthropogenic forces or introduced non-native species. Perhaps the hand of natural selection plays a role in the specie's threatened status.
Ogasawarana yoshiwarana is listed as critically endangered in the IUCN Red List of Threatened Species . [1]
Last record of this species is from 1902 by type description by Henry Augustus Pilsbry. [3] The species is considered to be critically endangered. [3]
The Ogasawara Islands, also known as the Bonin Islands, are a Japanese archipelago of over 30 subtropical and tropical islands located around 1,000 kilometers (620 mi) SSE of Tokyo and 1,600 kilometers (1,000 mi) northwest of Guam. The group as a whole has a total area of 84 square kilometers (32 sq mi) but only two of the islands are permanently inhabited, Chichijima and Hahajima. Together, their population was 2560 as of 2021. Administratively, Tokyo's Ogasawara Subprefecture also includes the settlements on the Volcano Islands and the Self-Defense Force post on Iwo Jima. The seat of government is Chichijima.
Hahajima, Haha Jima, or Haha-jima is the second-largest island within the Bonin or Ogasawara Islands SSE of the Japanese Home Islands. The steeply-sloped island, which is about 21 km2 (8 sq mi) in area, has a population of 440. It is part of Ogasawara Village in Ogasawara Subprefecture, which is approximately 1,000 km (620 mi) south of Tokyo, Japan.
The Ogasawara subtropical moist forests is a terrestrial ecoregion which encompasses the Ogasawara Archipelago of Japan. The Ogasawara Archipelago lies in the Pacific Ocean south of Honshu, Japan's largest island, and north of the Marianas Islands. The ecoregion includes the Bonin Islands and Volcano Islands chains. The islands are volcanic in origin, and have never been linked to a continent. They are home to distinct plants and animals including many endemic species.
Ogasawara National Park is a national park in the Ogasawara Islands, located approximately one thousand kilometres to the south of Tokyo, Japan. The park was established in 1972 within the municipality of Ogasawara, itself part of Tokyo. In 2011, the Ogasawara Islands were inscribed upon the UNESCO World Heritage List.
The Bonin white-eye or meguro (メグロ) is a small songbird endemic to the Bonin Islands of Japan. It is the only species in the genus Apalopteron. Its taxonomic affinities were a long-standing mystery and it has been placed with the bulbuls, babblers and more recently with the honeyeaters, during which it was known as the Bonin honeyeater. Since 1995 it is known to be a white-eye in the family Zosteropidae, that is closely related to the golden white-eye of the Marianas Islands.
Vertigo genesii, common name the round-mouthed whorl snail, is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusc in the family Vertiginidae, the whorl snails.
Hirasea acutissima is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Charopidae. The width of the shell is 2 mm. The height of the shell is 4 mm. H. acutissima is endemic to Haha-jima in the Ogasawara Islands, Japan, and is listed as endangered in the IUCN Red List of Threatened Species. In 2007, the species was rediscovered after being considered to be extinct.
Hirasea is a genus of small, pulmonate land snails in the family Charopidae. This genus sees its highest diversity in the Hawaiian Islands, but species are distributed throughout Japan and Polynesia.
The Bonin flying fox, Bonin fruit bat, or in Japanese Ogasawara giant bat is a species of flying fox in the family Pteropodidae. It is endemic to four islands in Ogasawara Islands, Japan. Its natural habitat is subtropical forests. It is threatened by habitat loss.
The shoal sprite was a species of minute, air-breathing, freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This species was endemic to Alabama, but it is now extinct.
Mandarina is a genus of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Bradybaenidae.
Ogasawarana is a genus of land snails with an operculum, terrestrial gastropod mollusk in the family Helicinidae, the helicinids.
Ogasawarana ogasawarana is a species of land snail with an operculum, a terrestrial gastropod mollusk in the family Helicinidae, the helicinids.
Vertigo dedecora is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae.
Trochochlamys ogasawarana is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Chronidae.
Vertigo substriata is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.
Ogasawara Subprefecture is a subprefecture of the Tokyo Metropolitan Government in Japan. The subprefecture covers the Bonin and Volcano Islands and three isolated islets and is coterminous with the village of Ogasawara. The subprefecture covers 104.41 square kilometers (40.31 sq mi) and has a population of 2,415 people. It maintains a main office on Chichijima and a branch office on Hahajima, the two permanent settlements in the islands.
Amphibulima browni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amphibulimidae.
Blanfordia simplex is a species of land snail that has an operculum, a terrestrial gastropod mollusk in the family Pomatiopsidae.
The Bonin Islands are an archipelago of over 30 subtropical and tropical islands, some 1,000 kilometres directly south of Tokyo, Japan and 1,000 miles northwest of Guam.
