Minidonta extraria Cooke & Solem

Strange Disc Snail (Minidonta extraria)

This species was described in the year 1976 from three specimens, of which one was found on the island of Akamaru, one on the island of Mangareva, and one on the island of Taravai.

The shells reach an average size of 0,29 cm in diameter.

*********************

References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976
[2] Ahmed Abdou; Philippe Bouchet: Nouveaux gastéropodes Endodontidae et Punctidae (Mollusca, Pulmonata) récemment éteints da l’archipel des Gambier (Polynésie). Zoosystema 22(4): 689-707. 2000

Advertisements

Anceyodonta andersoni Cooke & Solem

Anderson’s Disc Snail (Anceyodonta andersoni)

Anderson’s Disc Snail was described in the year 1976.

The species was originally known only based on specimens that had been collected in 1934 on the island of Mangareva, but was subsequently (in 2000) recorded in form of subfossil shells from Taravai, Mangareva’s neighbor island, as well.

The shells of the species reached an average size of 0,29 to 0,36 cm in diameter.

*********************

References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976
[2] Ahmed Abdou; Philippe Bouchet: Nouveaux gastéropodes Endodontidae et Punctidae (Mollusca, Pulmonata) récemment éteints da l’archipel des Gambier (Polynésie). Zoosystema 22(4): 689-707. 2000

Mautodontha consobrina (Garrett)

Huahine Mautodontha Snail (Mautodontha consobrina)

This species, which comes from the island of Huahine, was described in the year 1884.

The shells reach an average size of 0,38 cm in diameter.

Andrew J. Garrett, the species’ author writes in the year 1884.:

Rare and peculiar to one valley.

This statement is all, that is known about this now extinct species, of which obviously only seven museum specimens are in existence.

*********************

References:

[1] Andrew J. Garrett: The terrestrial Mollusca inhabiting the Society Islands”. Journal of the Academy of Natural Sciences of Philadelphia. 2nd series 9: 17-114. 1884
[2] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976

*********************

mautodontha-consobrina-mc

Depiction from: ‘G. W. Tryon; H. A. Pilsbry; u.a.: Manual of Conchology. Second Series: Pulmonata Vol. 3, Helicidae Vol. 1. 1887’

http://www.biodiversitylibrary.org

Minidonta aroa Brook

Aroa Minidonta Snail (Minidonta aroa)

This species was described in the year 2010 from subfossil shells that were found in the sandy soil of the coastal plains between the villages of Aro’a and Arorangi on the southwest coast of the island of Rarotonga.

The shells reach an average size of 0,25 to 0,3 cm in diameter.

~~~

The species, which obviously was restricted to lowland areas, died out most probably already shortly after the colonization of the island by Polynesians.

*********************

References:

[1] F. J. Brook: Coastal landsnail fauna of Rarotonga, Cook Islands: systematics, diversity, biogeography, faunal history, and environmental influences. Tuhinga 21: 161-252. 2010

Anceyodonta ganhutuensis Cooke & Solem

Gahutu Disc Snail (Anceyodonta ganhutuensis)

The Gahutu Disc Snail was described in the year 1976 based on subfossil shells, which had been found near the Gahutu Bay (not Ganhutu!) on the island of Mangareva, shells of this species were subsequently found on the island of Taravai as well.

The shells of this species reach an average size of 0,17 to 0,22 cm in diameter.

*********************

References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976
[2] Ahmed Abdou; Philippe Bouchet: Nouveaux gastéropodes Endodontidae et Punctidae (Mollusca, Pulmonata) récemment éteints da l’archipel des Gambier (Polynésie). Zoosystema 22(4): 689-707. 2000

Taipidon octolamellata (Garrett)

Eight-grooved Taipidion Snail (Taipidon octolamellata)

This species comes from the island of Hiva Oa, it was described in the year 1887, and obviously died out shortly after.

~~~

Obviously, there is only a single voucher specimen left today, a shell with a size of about 0,4 cm in diameter.

*********************

References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part II, Families Punctidae and Charopidae, Zoogeography. Field Museum of Natural History Chicago, Illinois 1983

Minidonta matavera Brook

Matavera Minidonta Snail (Minidonta matavera)

The Matavera Minidonta Snail from the island of Rarotonga was described in the year 2010.

This species is known only from empty shells, some of which are in a subfossil condition, while others appear relatively fresh, suggesting a relatively recent extinction date.

The shells reached a height of about 0,25 cm. [1]

*********************

References:

[1] Fred J. Brook: Coastal landsnail fauna of Rarotonga, Cook Islands: systematics, diversity, biogeography, faunal history, and environmental influences. Tuhinga 21: 161-252. 2010

Thaumatodon decemplicata (Mousson)

Tuvaluan Thaumatodon Snail (Thaumatodon decemplicata)

This species was described in the year 1873.

The minute species, whose shell reaches a size of only about 0,26 cm in diameter, seems to live in decaying wood.

The Tuvaluan Thaumatodon Snail is currently known only from several specimens that had been collected on the Nukufetau- and the Vaitupu atoll respectively, its status is unfortunately currently unknown.

~~~

The genus Thaumatodon currently comprises nine species, which all occur exclusively on some few islands in Polynesia.

Mautodontha maupiensis (Garrett)

Maupiti Disc Snail (Mautodontha maupiensis)

This species from the island of Maupiti was described in the year 1884.

The shells reach an average size of 0,3 cm in diameter. [2]

~~~

Andrew J. Garrett, the species’ author, writes in the year 1884.:

“Very common, and confined to the small island of Maupiti.”

Thus, the Maupiti Disc Snail, of which today twenty-one museum specimens are still in existence, must still have been very common in the 19th century, but died out shortly after. [1][2]

*********************

References:

[1] Andrew J. Garrett: The terrestrial Mollusca inhabiting the Society Islands”. Journal of the Academy of Natural Sciences of Philadelphia. 2nd series 9: 17-114. 1884
[2] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976

*********************

mautodontha.maupiensis.mc

Depiction from: ‘G. W. Tryon; H. A. Pilsbry; u.a.: Manual of Conchology. Second Series: Pulmonata Vol. 3, Helicidae Vol. 1. 1887’

http://www.biodiversitylibrary.org

Graeffedon graeffei (Mousson)

Gräffe’s Graeffedon Snail (Graeffedon graeffei)

This species from the Samoan island of ‘Upolu, which is known only from a handful specimens, was described in the year 1869.

The shells reach an average size of 0,46 to 0,59 cm in diameter.

Gräffe’s Graeffedon Snail inhabited the leaf litter of the rainforests, where it easily felt victim to introduced rats, and more so to the likewise introduced Yellow Crazy Ants (Anoplolepis gracilipes F. Smith).

The last specimen was collected in the year 1965.

*********************

References:
[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part II, Families Punctidae and Charopidae, Zoogeography. Field Museum of Natural History Chicago, Illinois 1983
[2] Robert H. Cowie; A. C. Robinson: The decline of native Pacific island faunas: changes in status of the land snails of Samoa through the 20th century. Biological Conservation 110: 55-65. 2003

*********************

graeffedon-graeffei-mc

Depiction from: ”G. W. Tryon; H. A. Pilsbry; u.a.: Manual of Conchology. Second Series: Pulmonata Vol. 3, Helicidae Vol. 1. 1887′

http://www.biodiversitylibrary.org