Cryptomastix devia

Cryptomastix (Cryptomastix) devia (Gould, 1846)
Puget Oregonian

  • Helix devia Gould 1846 (1846–1850): 165.
  • Helix baskervillei L. Pfeiffer 1850: 130.
Cryptomastix devia; Auburn, Washington, USA.

Identification. Shell depressed-globose. Spire conical, sides slightly convex. Periphery rounded, medial. Whorls ca 6, convex. Suture moderately indented. Protoconch initially smooth, then granular. Teleoconch with low, coarse, irregular striae and shallow spiral lines. Aperture subovate-lunate, wider than high. Apertural denticle in adults: parietal tooth long, curved. Umbilicus small, partly overhung by the columellar lip. Shell opaque, semi-glossy or semi-matte, yellowish brown; lip and parietal denticle whitish. Shell to ca 20–23 mm wide (wider than high).

Habitat. Unknown for Canada but moist, lowland forests in USA.

Global range. South-western BC, south through western Washington to the Columbia Gorge, Oregon (Pilsbry 1940, Vagvolgyi 1968).

Canadian range. British Columbia: historically, Sumas Prairie in the Fraser Valley (Dall 1905) and Esquimalt (Taylor 1889) on Vancouver Island (Pfeiffer 1850). This species has not been seen alive in British Columbia for many years and is presumed extirpated (COSEWIC 2002, 2013).

Etymology. Latin, devius, “solitary” or “out of the way”.


References

  • COSEWIC (2002) COSEWIC assessment and status report on the Puget oregonian snail Cryptomastix devia in Canada. Committee on the Status of Endangered Wildlife in Canada, Ottawa, vi + 20 pp. https://wildlife-species.canada.ca/species-risk-registry/virtual_sara/files/cosewic/sr_puget_oregonian_snail_e.pdf
  • COSEWIC (2013) COSEWIC status appraisal summary on the Puget Oregonian Cryptomastix devia in Canada. Committee on the Status of Endangered Wildlife in Canada, Ottawa, xv pp. https://sararegistry.gc.ca/virtual_sara/files/cosewic/sas_escargot_puget_oregonian_1213_e.pdf
  • Dall WH (1905) Land and fresh water mollusks. Harriman Alaska Expedition, Vol. 13. Doubleday, Page and Co., New York, 1–171, pls 1–2.
  • Gould AA (1846–1850) [Shells collected by the United States Exploring Expedition under the command of Charles Wilkes.] Proceedings of the Boston Society of Natural History 2: 141–145, 148–152 [July 1846]; 153–156, 159–162, 165–167 [August 1846]; 170–173, 175–176 [September 1846]; 177–179, 180–184, 185–187, 190–192 [“November 1846”; probably between 16 December 1846 and March 1847]; 196–198, 200–203, 204–208 [March 1847]; 209, 210–212, 214–215, 222–224 [June 1847]; 225, 237–239 [July 1847]; 251–252 [December 1847] • 3: 73–75 [November 1848]; 83–85, 89–92 [March 1849]; 106–109 [April 1849]; 118–121, 140–144 [May 1849]; 151–156, 169–172 [January 1850]; 214–219 [May 1850]; 252–256 [June 1850], 276–278 [July 1850]; 292–296, 309–312 [November 1850]; 343–348 [December 1850].
  • Pfeiffer L (1850) Descriptions of twenty-four new species of Helicea, from the collection of H. Cuming, Esq. Proceedings of the Zoological Society of London, with Illustrations for 1849 17: 126–131.
  • Vagvolgyi J (1968) Systematics and evolution of the genus Triodopsis (Mollusca: Pulmonata: Polygyridae). Harvard University, Museum of Comparative Zoology, Bulletin 136: 145–254.