Pernastela howensis, also known as the Lord Howe pinhead snail, is a tiny species of land snail that is endemic to Australia's Lord Howe Island in the Tasman Sea.

[2] The trochoidal shell of the mature snail is 1.8–2.1 mm in height, with a diameter of 3–3.3 mm, and a raised spire.

The whorls are shouldered and sutures impressed, with widely spaced radial ribs.

It has an roundly lunate aperture, flattened on the upper side by the reflected lip, and a moderately wide umbilicus.

[2] The snail is known only from three worn shells collected from the summit of Mount Gower in 1912, and it may be extinct.