Sandhill Frog

Taxobox | name = Sandhill Frog
status = LC | status_system = IUCN3.1
trend = stable
regnum = Animalia
phylum = Chordata
classis = Amphibia
ordo = Anura
familia = Myobatrachidae
genus = "Arenophryne"
genus_authority = Tyler, 1976
species = "A. rotunda"
binomial = "Arenophryne rotunda"
binomial_authority = (Tyler, 1976)
range_

range_map_caption = Distribution of "Arenophryne" (in black).

The Northern Sandhill Frog ("Arenophryne rotunda") is a small, fossorial frog native to a small region of the Western Australian coast. It is the sole species within the "Arenophryne" genus. However, recently a new species of frog called the Southern Sandhill Frog was discovered about 100 kilometers from Geraldton, Western Australia in Kalbarri National Park and given the scientific name "Arenophryne xiphorhyncha".

Physical description

The Northern Sandhill Frog is a small, rotund frog, reaching a maximum length of 33 millimetres (1.3 in). It is a burrowing frog, and has short, strong legs. The dorsal surface is mottled in colour, from dark grey and white to pale brown. It is covered in small warts and ridges. It also has small, bright red or green, patches on its back. The ventral surface is a dull white. The head is small, and triangular in shape, and the body is flat. The tympanum is not visible

Ecology and behaviour

The Sandhill frogs are one of the more peculiar of the Australian ground frogs, family Myobatrachidae. Most of the Australian burrowing frogs burrow backwards; only the Sandhill Frog and the Turtle Frog ("Myobatrachus gouldii") burrow head first. To achieve this, both frogs have small heads and strong arms. The Sandhill Frog inhabits coarse-grained sand dunes on the coast of Western Australia, ranging from Shark Bay in the north, Kalbarri National Park in the south and Cooloomia in the east. They inhabit an area which does not have much free-standing water, as it is quickly absorbed into the sand. However, the sand becomes moist at a relatively shallow depth. During the day, the Sandhill frog will avoid desiccation by burrowing into the moist layer of the sand, emerging at night to hunt. Their diet primarily consists of ants.

During March and April, the males will call from above or below the surface of the sand. The male and female will burrow together. As the dry season dries out the sand, the frogs will continue to dig further to remain in the wet layer. They may reach depths of 80 cenimetres (2.6 ft). They will lay a maximum of eleven eggs underground, where they undergo direct development, and bypass the tadpole stage. The adult frogs will remain under ground for at least five months.

References

* Database entry includes a range map and a brief justification of why this species is of least concern
*cite book| last=Tyler| first=M. J.| year=1994| title=Australian Frogs A Natural History| publisher=Reed Books| id=ISBN 0-7301-0468-0
*cite book| last=Barker| first=J.| coauthors= Grigg, G.C. & Tyler, M.J.| year=1995| title=A Fiesld Guide to Australian Frogs| publisher=Surrey Beatty & Sons| id=ISBN 0-949324-61-2
*cite web| title=AmphibiaWeb| url=http://www.amphibiaweb.org/cgi-bin/amphib_query?table=amphib&where-genus=Arenophryne&where-species=rotunda| accessdate=2006-06-05
*cite web| title=Amphibian Species of the World - Arenophryne Tyler, 1976| url=http://research.amnh.org/herpetology/amphibia/references.php?g_id=740| accessdate=2006-06-05
*cite web| title=Frogs Australia Netowork - Australian Frog Database - Arenophryne rotunda - Sandhill Frog |url=http://frogsaustralia.net.au/frogs/display.cfm?frog_id=2| accessdate=2006-06-05