Tag Archives: Amastra flavescens

Amastra flavescens ssp. saxicola Baldwin

Southern Yellowish Amastra Snail (Amastra flavescens ssp. saxicola)

The Southern Yellowish Amastra Snail is a form of the Yellowish Amastra Snail (Amastra flavescens(Newcomb)), from the far south of the island of Hawai’i, it was found on an ancient aa (lava) flow at the foothills of the Mauna Lao volcano in the Ka’u District.

This form differs from the nominate race by its more convex whorls of which the last one is rounded peripherally. [1]

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References:

[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 23: Appendix to Amastridae. Tornatellinidae. Index, vols. XXI-XXIII. 1915-1916

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edited: 15.06.2020

Amastra flavescens (Newcomb)

Yellowish Amastra Snail (Amastra flavescens)

The Yellowish Amastra Snail is, or rather was, endemic to the island of Hawai’, Hawaiian Islands, it is believed to have been quite widespread with several populations occurring in nearly all forested areas of the island. [1]

The shells reached sizes of about 1,5 to 1,6 cm in heigth.

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References:

[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 23: Appendix to Amastridae. Tornatellinidae. Index, vols. XXI-XXIII. 1915-1916

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Depiction from: ‘George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol. 23: Appendix to Amastridae. Tornatellinidae. Index, vols. XXI-XXIII. 1915-1916’

(public domain)

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edited: 15.06.2020

Amastra flavescens ssp. emortua Cooke

Died-out Amastra Snail (Amastra flavescens ssp. emortua)

This form was described in 1917; it is known from (sub)fossil remains that were recovered from deposits of the Huehue (flow?) on the north-western slopes of the Hualālai Volcano in northern Kona on the island of Hawai’i, Hawaiian Islands.

The shells reach average sizes of 1,8 cm in heigth.

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References:

[1] C. Montague Cooke: Some new species of Amastra. Bishop Museum Occasional Papers 3(3): 1-34. 1917

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Photo from: ‘C. Montague Cooke: Some new species of Amastra. Bishop Museum Occasional Papers 3(3): 1-34. 1917’

(public domain)

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edited: 04.05.2022