Tag Archives: Gastrocoptidae

Gastrocopta chichijimana Pilsbry

Chichijimana Whorl Snail (Gastrocopta chichijimana)

The Chichijimana Whorl Snail was described in 1916; it is only known from the island of Chichijima in the Ogasawara Islands, Japan.

The shells reach heights of about 0.24 cm; they are rimate, ovate-conic, pale olive buff and almost smooth but hardly shining, the aperture has eight teeth of which three are on the parietal wall.

The species disappeared sometimes during the middle 20th century.

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Depiction from: ‘George W. Tryon; Henry A. Pilsbry a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 24, Pupillidae (Gastrocoptinae), 1916-1918’  

(public domain) 

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edited: 22.01.2024

Gastrocopta ogasawarana Pilsbry

Ogasawara Whorl Snail (Gastrocopta ogasawarana 

The Ogasawara Whorl Snail inhabited the islands of Chichijima and probably Ototojima in the Ogasawara Island group, Japan.  

The reasons for the extinction of this snail species are the same as for the closely related Chichijima Whorl Snail (Gastrocopta chichijimana Pilsbry).  

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Depiction from: ‘George W. Tryon; Henry A. Pilsbry a.o.: Manual of Conchology. Second series: Pulmonata, Vol. 24, Pupillidae (Gastrocoptinae), 1916-1918’

(public domain)

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References:  

[1] Takashi Ohbayashi; Isamu Okochi; Hiroki Sato; Tsuyoshi Ono: Food habit of Platydemus manokwari De Beauchamp, 1962 (Tricladida: Terricola: Rhynchodemidae), known as a predatory flatworm of land snails in the Ogasawara (Bonin) Islands, Japan. Entomology and Zoology 40: 609-614. 2005  

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edited: 07.11.2020