Adclarkia dawsonensis

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Boggomoss Snail / Dawson Valley Snail
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Eupulmonata
Family: Camaenidae
Genus: Adclarkia
Species: A. dawsonensis
Binomial name
Adclarkia dawsonensis
Stanisic, 1996

Adclarkia dawsonensis is a species of gastropod in the Camaenidae family. Adclarkia dawsonensis is the first identified species in the genus Adclarkia and is found in the Taroom district in Queensland, Australia.

The specific name dawsonensis is named for the Dawson River valley where the snail is found. The genus is named after local conservationist Adam Clark. The snail was named by John Stanisic, a scientist at the Queensland Museum.[1][2][3]


There are currently two known locations of the species, both in the Taroom area.[4]

The first is located in three boggomosses on Mt Rose Station (private property), with an estimated population >350, spread over an area of approximately 0.75 ha. Before the surrounding land was cleared for farming these three sites were probably part of the same population group.

The second is located in the riparian zone of the Dawson River on a camping and water reserve at the Isla-Delusion crossing approximately halfway between the towns of Taroom and Theodore, with an estimated population of <500 spread over an area of approximately 44.5 ha.

It is thought that the species was once more widespread but its range has been greatly reduced by destruction of its preferred habitat.


The comparatively thin and semi-transparent shell is of helicoid shape is light-brown to greenish-yellow horn, occasionally with a narrow, red subsutural band and a small, red circumumbilical patch. The shell has 5 1/8 to 5 5/8 whorls with last whorl slowly descending. Very slightly elevated apex and spire. The aperture is subcircular. The apertural margin is white and weakly reflected. The umbilicus is small, 2.34~3.24 mm (mean 2.63 mm), and partly covered by the dilated columellar margin. The width of the shell is 21.68-25.74 mm (mean 23.82 mm). The height of the shell is 14.58-16.62 mm (mean 15.80 mm).[5]

The shell surface appears smooth, but microscopically shows a series of covering ridglets that bear a fine elongate scale in fresh specimens.[6]

The animal has colour variations within the species, being light brown to white with varying amounts of grey on the neck, sides of the foot and above the tail.[5] Distinct irregular black blotches on the lung roof are visible through the shell.[6]



  1. ^ "A Review of the Conservation Status of Selected Australian Non-Marine Invertebrates" (PDF). pp. 16–20. Retrieved October 27, 2012. 
  2. ^ Williams, Brian (June 25, 2012). "Pride of Australia 2012: Top grazier finds it easy being green". The Courier-Mail (Brisbane). Retrieved October 27, 2012. 
  3. ^ "Speed urged on Nathan Dam snail plan". Queensland Country Life. 18 March 2008. Retrieved October 27, 2012. 
  4. ^ Stanisic, John (April 27, 2009). "Boggomoss Snail Survey Report" (PDF). pp. i,34–36. Retrieved October 27, 2012. 
  5. ^ a b Stanisic, John (July 29, 1996). "New land snails from boggomoss environments in the Dawson Valley, southeastern Queensland (Eupulmonata: Charopidae and Camaenidae)" (PDF). Memoirs of the Queensland Museum 39 (2): 343–354. ISSN 0079-8835. Retrieved June 21, 2014. 
  6. ^ a b Stanisic, John (2008). "Recovery plan for the boggomoss snail Adclarkia dawsonensis" (PDF). Retrieved June 21, 2014.