Tag Archives: Euconulidae

Philonesia arenofunus H. B. Baker

Koloa Philonesia Snail (Philonesia arenofunus)

Distribution:

Hawai’i Islands: Kaua’i

local names: –

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This species is one of several that are known from subfossil or even fossil specimens alone; in this case they were recovered from sand dunes near Aweoweonui near the south-eastern coast of Kaua’i, Hawaiian Islands.

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References:  

[1] H. Burrington Baker: Zonitid snails from Pacific islands – part 2: Hawaiian genera of Microcystinae. Bishop Museum Bulletin 165: 105-223. 1940

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edited: 15.07.2022

Dupontia proletaria Morelet

(Dupontia proletaria)

This species was described in 1860; it was restricted to the island of Mauritius and is now extinct.

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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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edited: 29.01.2024

Coneuplecta turrita ssp. palauensis (Baker)

Palauan Coneuplectra Snail (Coneuplecta turrita ssp. palauensis)

This taxon was described in 1941, as a subspecies of a species that is believed to inhabit the Philippine Islands.

The Palauan Coneuplectra Snail seems to have been restricted to the island of Peleliu in the Palau archipelago, Micronesia.

The snail has not been found alive since 1936; in recent years only some few empty shells have been found and this form very likely is extinct now.

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This taxon almost certainly is a distinct species.

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edited: 19.08.2022

Microcystis kondoi Baker

Kondo‘s Microcystis-Schnecke (Microcystis kondoi 

This species, described in 1938, is endemic to the island of Tubuai, Austral Islands in French Polynesia. [1]  

The species was not found during recent searches and is thought to be extinct. [2]  

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References:  

[1] H. Burrington Baker: Zonitid snails from Pacific Islands: Southern genera of Microcystinae. Bishop Museum Bulletins 158: 1-101. 1938 
[2] Olivier Gargominy; Benoît Fontaine: A Global Overview of the Terrestrial and Freshwater Molluscs. In: Jean-Yves Meyer; Elin. M. Claridge: Biodiversity of the Austral Islands, French Polynesia. Muséum national d´Histoire naturelle, Paris. 55-91. 2014  

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edited: 22.03.2018

Microcystis andersoni H. B. Baker

Anderson’s Microcystis Snail (Microcystis andersoni)

Anderson’s Microcystis Snail was described in 1938, it is known from specimens that had been collected in 1934 under logs and stones at a hillside of Mt. Tavaetu on the island of Tubuai, Austral Islands.

The author gives a description of the life animal.:

Animal similar to M. ornatella but with row of black dots between pedal grooves, similar squarish ones above this and vaguer, smaller ones below; mantle-lobes and shell-laps edged with dark spots.” [1]

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The species could not be found during recent searches and is considered most likely extinct. [2]

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References:

[1] H. Burrington Baker: Zonitid snails from Pacific Islands: Southern genera of Microcystinae. Bishop Museum Bulletins 158: 1-101. 1938 
[2] Olivier Gargominy; Benoît Fontaine: A Global Overview of the Terrestrial and Freshwater Molluscs. In: Jean-Yves Meyer; Elin. M. Claridge: Biodiversity of the Austral Islands, French Polynesia. Muséum national d´Histoire naturelle, Paris. 55-91. 2014

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edited: 16.05.2019

Cookeana vindex H. B. Baker

Vindex Snail (Cookeana vindex)

The Vindex Snail was described in 1938, specimens were collected in 1934 at the northeastern slope of Mt. Pane on the island of Tubuai, Austral Islands.

The shells were turbinate and had large whorls, they were light brown, dull and hairy above with a polished base and bright chestnut with a light-brown band just below the angle.

The author of the species also gives a description of the animal itself.:

Animal with foot usually dark, more deeply pigmented between pedal grooves, in 3 middorsal stripes on head and over mantle-lobes and shell-lap; lung dark or with network of transparent, whitish patches around kidney and pulmonary vein; apical whorls with considerable dark pigment and with blood vessels outlined by chalky deposit, Tail with distinct dorsomedian groove and short tail horn.” [1]

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This species was not found during all recent surveys and is believed to be extinct. [2]

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References:

[1] H. Burrington Baker: Zonitid snails from Pacific Islands: Southern genera of Microcystinae. Bishop Museum Bulletins 158: 1-101. 1938 
[2] Olivier Gargominy; Benoît Fontaine: A Global Overview of the Terrestrial and Freshwater Molluscs. In: Jean-Yves Meyer; Elin. M. Claridge: Biodiversity of the Austral Islands, French Polynesia. Muséum national d´Histoire naturelle, Paris. 55-91. 2014

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edited: 16.05.2019

Cookeana anathesis H. B. Baker

Cookeana Snail (Cookeana anathesis)

The Cookena Snail was described in 1938 based on specimens that had been collected in 1934 at a lowland hill side at Mt. Tavaetu on the island of Tubuai, Austral Islands. The species was originally found, apparently quite abundantly, on all kind of native vegetation as well as under logs and stones.

The Cookeana Snail was similar to the congeneric Vindex Snail (Cookeana vindex H. B. Baker), with which together it was described, but differed from that species by several characters including its shell-lap having a row of black dots. [1]

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This species was not found during all recent surveys and is believed to be extinct. [2]

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References:

[1] H. Burrington Baker: Zonitid snails from Pacific Islands: Southern genera of Microcystinae. Bishop Museum Bulletins 158: 1-101. 1938 
[2] Olivier Gargominy; Benoît Fontaine: A Global Overview of the Terrestrial and Freshwater Molluscs. In: Jean-Yves Meyer; Elin. M. Claridge: Biodiversity of the Austral Islands, French Polynesia. Muséum national d´Histoire naturelle, Paris. 55-91. 2014

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edited: 16.05.2019

Microcystis adusta H. B. Baker

Burnt Microcystis Snail (Microcystis adusta)

The Burnt Microcystis Snail was described in 1938, it was in 1934 collected near the shore in littoral forest on the island of Tubuai, Austral Islands.

The species is described as having been similar to the congeneric Anderson’s Microcystis Snail (Microcystis andersoni H. B. Baker) with which tiogether it was described. [1]

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The Burnt Microcystis snail was not recorded during recent field surveys and may be already extinct.

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References:

[1] H. Burrington Baker: Zonitid snails from Pacific Islands: Southern genera of Microcystinae. Bishop Museum Bulletins 158: 1-101. 1938 
[2] Olivier Gargominy; Benoît Fontaine: A Global Overview of the Terrestrial and Freshwater Molluscs. In: Jean-Yves Meyer; Elin. M. Claridge: Biodiversity of the Austral Islands, French Polynesia. Muséum national d´Histoire naturelle, Paris. 55-91. 2014

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edited: 16.05.2019

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

Philonesia waimanaloi H. B. Baker

Waimanalo Philonesia Snail (Philonesia waimanaloi)

The Waimanalo Philonesia Snail was described in 1940 based on subfossil specimens that were collected from sand dunes at the Waimanalo beach on the eastern edge of O’ahu, Hawaiian Islands.

This species might have gone extinct shortly after the arrival of the first Polynesian settlers.

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References:  

[1] H. Burrington Baker: Zonitid snails from Pacific islands – part 2: Hawaiian genera of Microcystinae. Bishop Museum Bulletin 165: 105-223.1940

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edited: 14.07.2022

Dancea bewsheriana (Morelet)

Bewsher’s Plegma Snail (Dancea bewsheriana 

This species was described in 1875.  

The species was endemic to the island of Rodrigues, Mascarene Islands, and is apparently known exclusively from subfossil specimens. [1]  

Bewsher’s Plegma Snail was a quite large species, the shells reached sizes of over 3 cm in diameter.  

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References:  

[1] Vincent Florens: Mollusques terrestres récoltés dans les grottes de Rodrigues. Bulletin Phaethon 3: 42-43. 1996  

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Depiction from: ‘A. Morelet: Appendice à la Conchyliologie de l’île Rodrigues. Journal de Conchyliologie 23: 21-30. 1875’

(public domain) 

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edited: 31.10.2017