Libera subcavernula (Tryon)

Cavity-bearing Libera Snail (Libera subcavernula)

The Cavity-bearing Libera Snail was described in 1887; it was restricted to the island of Rarotonga, Cook Islands.

Found plentifully in the mountain ravines, and is peculiar to Rarotonga.
It is closely related to the preceding species
 [Libera fratercula (Pease)], but may be distinguished by its darker color, smaller ribs, less prominent keel, and the shallow groove immediately above the revolving keel is not so conspicuous. In a careful comparison of numerous young examples of different ages I remark the umbilicus is considerably broader in cavernula than in fratercula” [1]

The shells reach sizes of 0.53 to 0.76 cm in diameter; they are yellowish horn-colored with numerous, somewhat irregular, reddish flammulations that fade out near the umbilicus.

The Cavity-bearing Libera Snail died out soon after its description.

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syn. Libera cavernula (Garrett)

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Depiction from: ‘George W. Tryon; Henry A. Pilsbry; a. o.: Manual of Conchology. Second series: Pulmonata. Vol 3: Helicidae – Volume I. 1887’

(public domain)

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References:

[1] Andrew Garrett: The terrestrial Mollusca inhabiting the Cook’s or Harvey Islands. Journal of the Academy of Natural Sciences of Philadelphia. Ser. 2. Vol. 8(4): 381-412. 1881
[2] George W. Tryon; Henry A. Pilsbry; a. o.: Manual of Conchology. Second series: Pulmonata. Vol 3: Helicidae – Volume I. 1887
[3] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976

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edited: 17.02.2024