This species was described in 1906, it was endemic to a single area at an elevation of 1220 on the slopes of the Mt. Helu on western Maui, Hawaii Islands.
The shell has a size of about 2,1 cm.
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The author of the species also described the life animal.:
“Animal extended in motion longer than the shell. Mantle brownish-black with outer edge bordered with narrow white line. Foot below and sides light slate color. Head above and tentacles dark slate and granulated.”
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The Mt. Helu Partulina Snail was last seen in 1981 and is now clearly extinct.
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Depiction from: ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914’
This species was described in 1913, it was endemic to the island of O’ahu, Hawaiian Islands.
The shells are quite large, about 2,5 to 2,7 cm.
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The species was apparently already extinct when it was discovered and described.:
“The shells occur in the humus near the surface, along the roadside, and are very rare, apparently lying in “pockets” which have been filled and covered by the wash down the slope. Probably the forest disappeared from where the shells are found not much than hundred years ago.” [1]
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References:
[1] ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22. 1912-1914
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Depiction from: ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914’
This species was described in 1895, it was endemic to the island of Hawai’i, Hawaiian Islands.
The species was arboreal and was commonly found on the endemic Hawaiian ‘ahakea (Bobea elatior Gaudich.), and sometimes also on kawa’u (Ilex anomala Hook. & Arn.), ‘ohi’a lehua (Metrosideros polymorpha Gaudich.), and kolea lau nui (Myrsine lessertiana A. DC.).
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The author of the species also gave a description of the live animal.:
“Animal in motion longer than the shell. Mantle black, margined with gray. Foot above and below gray, the superior portions lightly granulated. Tentacles light gray.”
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Horner’s Partulina Snail was last seen in 1992, when it was restricted to two populations in the Hamakua- and Kohala districts respectively. [1]
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References
[1] Michael G. Hadfield; Lisa J. Hadway: Conservation status of tree snail species in the genus Partulina (Achatinellinae) on the Island of Hawai’i: a modern and historical perspective. Pacific Science 53(1): 1-14. 1999
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Depiction from: ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914’
This species was described in 1856, it was restricted to western Maui, Hawaiian Islands.
The shells reached sizes of up to 2,5 cm.
The Scorched Partulina Snail was an arboreal species, it was recorded living on shrubs including the Hawaiian endemic mamaki (Pipturus albidus (Hook. & Arn.) A. Gray ex H. Mann).
This species was described in 1900, it was endemic to the Hamakua- and Kohala districts of Hawai’i, Hawaiian Islands.
The species was arboreal and was found on several native shrubs like the ilima (Sida fallax Walp.), and trees including the olopua (Nestegis sandwichensis ((A. Gray) O. Deg., I. Deg. & L. A. S. Johnson) and the mamane (Sophora chrysophylla (Salisb.) Seem.). [1][2]
The shells are quite large, reaching sizes of about 2,6 to nearly 2,8 cm.
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One of several reasons for the extinction of this and other endemic Hawaiian snail species is the collection of their shells.:
“In the late 1800s and early 1900s, landsnail collecting was a popular pastime on the Hawaiian Islands … Henshaw … referred to a colony of Partulina confusa on the Waimea Plains that had an estimated population size of 75,000 and where he and other collectors collected 10,000 shells in just 3 months …. The collections at the Bishop Museum also provide evidence for the shell-collecting pressure that was put on these snails on Hawai’i Island. There are 2827 shells of Partulina ssp. from Hawai’i Island in the collection, over half of them (1655) being shells of P. confusa, a species that now seems to be extinct.” [2]
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References:
[1] Michael G. Hadfield; Stephen E. Miller: Demographic Studies on Hawaii’s Endangered Tree Snails: Partulina proxima. Pacific Science 43(1): 1-16. 1989 [2] Michael G. Hadfield; Lisa J. Hadway: Conservation status of tree snail species in the genus Partulina (Achatinellinae) on the Island of Hawai’i: a modern and historical perspective. Pacific Science 53(1): 1-14. 1999
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Depiction from: ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914’
The Thick Partulina Snail was described in 1853, it was apparently restricted to a place named Kohele on the Hawaiian island of Lana’i, a place that now is so to say completely overgrown with foreign, invasive vegetation.
The shells of this rather large species reached sizes of 1,8 to 2,2 cm in heigth. [1]
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References:
[1] G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914
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Depiction from: ‘G. W. Tryon; H. A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 22: Achatinellidae. 1912-1914’
