Tag Archives: Hahajima

Agaricus hahashimensis S. Ito & S. Imai

Hahajima Horse Mushroom (Agaricus hahashimensis)

The Hahajima Horse Mushroom was collected in 1936 on the island of Hahajima in the Ogasawara group, Japan and was described in 1940.

The species is considered extinct. [1]

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References:  

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 30.08.2020

Circulocolumella hahashimensis (S. Ito & S. Imai) S. Ito & S. Imai in Imai

Hahajima Circulocolumnella Mushroom (Circulocolumella hahashimensis)

The Hahajima Circulocolumnella Mushroom was described in 1957, it is the sole member of its genus.

The species appears to be extinct now. [1]

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References:

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 31.08.2020

Psathyrella boninensis (S. Ito & S. Imai) S. Ito

Bonin Islands Brittlestem (Psathyrella boninensis)

The Bonin Islands Brittlestem is known only from one locality on Hahajima Island in the Ogasawara group, Japan.

The species is considered extinct. [1]

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References:

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 30.08.2020

Celastrina ogasawaraensis (Pryer)

Ogasawara Holly Blue (Celastrina ogasawaraensis)

The Ogasawara Holly Blue, described in 1886, is endemic to the Ogasawara Islands, where it appears to have been quite common until the 1970s, when its populations began to crash, mainly caused by the loss of their preferred host plant species due to the native vegetation being overrun by introduced invasive alien plants and because of increasing predation by likewise introduced Green Anoles (Anolis carolinensis Voigt), whose populations are now as high as about 6 million individuals. [1]

The species appears to be extinct in the wild since 2018, when the last individuals were seen.

For some time there had been attempts to establish a captive program: the species was kept in captivity since 2005, once in the Tama Zoological Park and then in the Shinjuku Gyoen National Garden, both in Tokyo, Japan.

However, these efforts apparently failed, and the last individuals apparently died in 2020.

The Ogasawara Holly Blue is now feared to have been lost.

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References:

[1] Yasuhiro Nakamura: Conservation of butterflies in Japan: status, actions and strategy. Journal of Insect Conservation 15: 5-22. 2011

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female

Photo: コミスジ空港

(under creative commons license (4.0))
http://creativecommons.org/licenses/by-sa/4.0


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edited: 02.11.2020

Camarophyllus microbicolor S. Ito

Two-colored Waxy Cap (Camarophyllus microbicolor)

This species is known from specimens that were collected on the islands of Chichijima and Hahajima in the Ogasawara Islands, Japan.

It is considered extinct. [1]

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References:

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 31.08.2020

Crepidotus subpurpureus S. Ito & S. Imai

Purple Crepidotus (Crepidotus subpurpureus)

This species is known from a single locality on the island of Hahajima in the Ogasawara group, Japan.

The species is considered extinct. [1]

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References:

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 02.09.2021

Pluteus daidoi S. Ito & S. Imai

Daido Shed Fungus (Pluteus daidoi)  

This species, described in 1940, is known only from one locality on Hahajima Island in the Ogasawara group, Japan.

The species is considered extinct. [1]

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References:  

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 30.08.2020

Pluteus horridilamellus S. Ito & S. Imai

Hahajima Shed Fungus (Pluteus horridilamellus)  

The Hahajima Shed Fungus, which was described in 1940, is known only from one locality on the island of Hahajima in the Ogasawara group, Japan.

The species is considered extinct. [1]

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References:  

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 30.08.2020

Hirasea eutheca Hirase

Straight Hirasea Snail (Hirasea eutheca)

The Straight Hirasea Snail was described in 1907; it is, or maybe was, restricted to the island of Hahajima in the Ogasawara Islands, Japan.

The shells reach sizes of about 0,2 cm in height and about 0,3 cm in diameter; the spire is low-conic and the base very convex.

The species is now likely extinct. [1]

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References:

[1] Robert H. Cowie; Claire Régnier; Benoît Fontaine; Philippe Bouchet. Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41. 2017

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Depiction from: ‘The Conchological Magazine 1907’

(public domain)

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edited: 17.05.2022

Gymnopilus noviholocirrhus S. Ito & S. Imai

Hahajima Gymnopilus (Gymnopilus noviholocirrhus)
 
This species was described in 1940; it is known only from a single locality on the island of Hahajima in the Ogasawara Islands, Japan, where it was found growing on the Bonin Islands Hackberry (Celtis boninensisKoidz.).

The species was apparently not found again since and is considered most likely extinct. [1]


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References:  

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 26.04.2022

Mandarina ogasawarana Chiba

Ogasawaran Mandarina Snail (Mandarina ogasawarana)

This species was described in 1999, it is known exclusively from Holocene deposits at Nankinhama on southern Hahajima Island, Ogasawara Islands, Japan.

The Ogasawaran Mandarina Snail was a medium-sized member of its genus, reaching average shell heigths of about 2 cm, they were characterized by a flat spire and a relatively large body whorl with a weak peripheral angulation and other characters.

The species disappeared at around 2000 BCE, most likely because of environmental changes due to natural climatic changes that resulted in a rise of temperatures creating a dryer climate. [1]

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References:

[1] Satoshi Chiba: A new species of land snail of the genus Mandarina (Gastropoda: Pulmonata) from Hahajima of the Bonin Islands, Western Pacific: a species that became extinct after 2000 yr. B.P.. Bulletin of the National Science Museum (C) 25(3-4): 121–127. 1999

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edited: 19.04.2019

Collybia matris S. Ito in S. Ito & S. Imai

Matrice Collybia Fungus (Collybia matris)

This species was described in 1939; it is known from the islands of Chichima and Hahajima in the Ogasawara Islands, Japan.

The species was not recorded during recent field studies and might be extinct. [1]

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References:

[1] Kentaro Hosaka; Takahito Kobayashi; Michael A. Castellano; Takamichi Orihara: The status of voucher specimens of mushroom spwcies thought to be extinct from Japan. Bulletin of the National Museum of Nature and Science Ser. B 44(2): 53-66. 2018

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edited: 26.04.2022

Hirasea planulata Pilsbry & Hirase

Planulate Hirasea Snail (Hirasea planulata) 

The Planulate Hirasea Snail was described in 1903, it is or was endemic to the island of Hahajima in the Ogasawara Islands of Japan.

The shells reach sizes of about 0,18 cm in heigth and about 0,32 cm in diameter, they are yellowish brown, dull and very densely, very finely radially striatea above, becoming smooth and glossy beneath. [1]

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References:

[1] H. A. Pilsbry; Y. Hirase: Notices of new Japanese land shells. The Nautilus 17(4): 44-46. 1903

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Depiction from: ‘The Conchological Magazine 1907’

(public domain)

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edited: 11.05.2019

Lamprocystis hahajimana ssp. pachychilus Pilsbry & Hirase

Thick-lipped Hahajima Lamprocystis Snail (Lamprocystis hahajimana ssp. pachychilus)

The Hahajima Lamprocystis Snail is apparently endemic to the island of Hahajima in the Ogasawara Islands, Japan, it can be split into at least five subspecies of which the one discussed here, appears to be extinct.

No further information is available so far.

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edited: 12.06.2020

Ogasawaracris gloriosus Ito

Ogasawara Grasshopper (Ogasawaracris gloriosus)

The Ogasawara Grasshopper was described in 2003 based on three specimens, two males that had been collected in 1984 on the island of Hahajima and that were found in the collections of the Laboratory of Systematic Entomology in Sapporo, as well a female lacking any data except for ‘Ogasawara’ found in the National Institute for Agro-Environmental Sciences in Tsukuba, Japan.

The species is quite large and was uniformly green colored in life (faded to yellowish brown after death).

The Ogasawara Grasshopper was never recorded alive and was never found since its description, thus it is believed that the species is most likely extinct. [1]

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References:

[1] Gen Ito: Ogasawaracris gloriosus, a new genus and species of possibly extinct grasshopper (Orthoptera: Acrididae) from the Ogasawara Islands. Entomological Science 6: 85-88.2003

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edited: 22.04.2019

Hirasea biconcava Pilsbry

Concave Hirasea Snail (Hirasea biconcava)  

This species was described in 1907, it was restricted to the island of Hahajima in the Ogasawara Islands, Japan.  

The shells reach a height of about 0,2 cm and are about 0,4 cm in diameter.  

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This species is also treated as subspecies of the Plane Hirasea Snail (Hirasea planulata Pilsbry & Hirase) . 

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Depiction from: ‘The Conchological Magazine 1907’  

(public domain)

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edited: 11.05.2019

Pluteus machidae S. Ito & S. Imai

Machida’s Shed Fungus (Pluteus machidae)

This species was described in 1940; it is known only from a small area on the island of Hahajima, where it was found growing on a dead trunk in the forest.

The species wasn’t found during recent fieldworks and is considered likely extinct.

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References:

[1] Takahito Kobayashi: Type studies of the new species of Pluteus described by Seiya Ito and Sanshi Imai from Japan. Mycoscience 43: 411-415. 2002

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edited: 26.04.2022

Hirasea sinuosa Pilsbry

Sinuose Hirasea Snail (Hirasea sinuosa) 

The Sinuose Hirasea Snail was described in 1902, it is or was endemic to the island of Hahajima, Ogasawara Islands, Japan.

The shells of this species reached sizes of about 0,21 cm in height and about 0,43 cm in diameter [1]

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Unfortunately it appears to be exremely hard to get any reliable information about this enigmatic snail genus.

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References:

[1] Henry A. Pilsbry: Notices of new Japanese land shells. The Nautilus 15(10): 116-119. 1902

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edited: 11.05.2019

Diplazium longicarpum Kodama

Long-wrist Diplazium Fern (Diplazium longicarpum)

This epiphytic species was described in 1916; it is apparently restricted to the island of Hahajima in the Ogasawara archipelago, Japan.

The fern disappeared during the 1980s due to overcollecting for ornamental uses. [1]

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References:

[1] Tod F. Stuessy; Mikio Ono: Evolution and Speciation of Island Plants. Cambridge University Press 1998

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edited: 10.01.2024