Tag Archives: Isla Pinzón

Naesiotus duncanus Dall

Duncan Island Snail (Naesiotus duncanus)

The Duncan Island Snail was described in 1893, it is restricted to the Isla Pinzón (aka. Duncan Island) in the Galapágos archipelago.

Except the largest specimens of B. nux, these shells are the largest Bulimuli described from the islands.” [1]

The shells reach sizes of about 1,8 cm in height and about 1,1 cm in diameter. [1]

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The species was never observed alive and is known exclusively from empty shells, thus it certainly was already extinct before it was scientifically described; it probably fell victim to a severe drought. [2]

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References:

[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol 11: American Bulimulidae: Bulimulus, Neopetraeus, Oxychona, and South American Drymaeus. 1897-1898’    
[2] Guy Coppois; Sue Wells: Threatened Galápagos snails. Oryx 21(4): 236-241. 1987

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Depiction from: ‘George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Vol 11: American Bulimulidae: Bulimulus, Neopetraeus, Oxychona, and South American Drymaeus. 1897-1898’  

(public domain)

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edited: 31.05.2021