Thwing’s Perdicella Snail (Perdicella thwingi)
Thwing’s Perdicella Snail was endemic to the dry Auwahi forest in eastern Maui, Hawaiian Islands.
This was one of the largets species in its genus, the shells are up to 1,6 to 1,7 cm heigh. [1]
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 22: Achatinellidae. 1912-1914
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edited: 16.06.2020
Glistening Perdicella Snail (Perdicella fulgurans)
The Glistened Perdicella Snail, described in 1900, was restricted to the Makawao District in eastern Maui, Hawaiian Islands. It shared its habitat with a close relative, the Maui Perdicella Snail (Perdicella maniensis (Pfeiffer)).
The shells in average reached heights of about 1,5 cm.
Like all of its congeners, also the Glistening Perdicella Snail was arboreal, it inhabited leaves, stems and trunks of the trees in the native rainforests, and probably fed on fungi.
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edited: 16.06.2020
Maui Perdicella Snail (Perdicella maniensis)
This species, described in 1856, was restricted to the Makawao District on eastern Maui, Hawaiian Islands.
The shells in average reached heights of about 1,2 cm.
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The scientific name of this species is possible a typographical error (originally mauiensis), yet due to the International Code of Zoological Nomenclature (the international rules of the zoological nomenclature) it must be accepted as valid name.
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edited: 16.06.2020
Nahiku Perdicella Snail (Perdicella carinella)
This species is known from a locality named Nahiku which is located at the northeastern coast of eastern Maui, Hawaiian Islands.
The shells reached sizes of 1,4 to 1,5 cm in heigth. [1]
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 22: Achatinellidae. 1912-1914
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edited: 16.06.2020
Zebra Perdicella Snail (Perdicella zebra)
The Zebra Perdicella Snail, which was endemic to eastern Maui in the Hawaiian Islands, was described in 1855 based on a single specimen.:
“It seems to resemble P. ornata in color-pattern, differing from zebrina Pfr. by the basal band.” [1]
The shell of this smaller species reached a height of about 1 cm.
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 22: Achatinellidae. 1912-1914
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edited: 16.06.2020
Ornated Perdicella Snail (Perdicella ornata)
The Ornated Perdicella Snail was described in 1853, it was inhabiting the rainforests on Mt. Helu in western Maui, Hawaiian Islands, another population assigned to the same species apparently occurred at a certain locality on eastern Maui.
The shells reach sizes of about 1,48 cm in heigth.
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 22: Achatinellidae. 1912-1914
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Depiction from: George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 22: Achatinellidae. 1912-1914’
(public domain)
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edited: 16.06.2020