Crinia riparia Littlejohn & Martin, 1965
Southern Flinders Ranges Froglet, Streambank Froglet
Crinia riparia is a small frog from southern Australia. Snout-vent length ranges 19.5-25.2mm. The dorsum is usually covered in fine warts, or is smooth. The snout is short and somewhat pointed. The tympanum is indistinct. Indistinct vocal sac in males. The digits are long and unwebbed, with fringes on the toes. Ventral surface varies in granularity, and may be entirely smooth. Females are larger than the males (Littlejohn and Martin 1965).
Coloration in life: C. riparia are typically brown dorsally, and white or cream ventrally with black mottling. Throat grey in males, flesh colored in females. Color and pattern, however, are highly variable both dorsally and ventrally.
C. riparia is distinguished from other Crinia species mainly by call, coloration, and larval morphology. The back pattern polymorphism seen in C. signifera and C. parinsignifera is incompletely expressed in C. riparia. C. riparia also has longer feet than either C. signifera or C. parinsignifera, and lacks a tarsal fold (Littlejohn and Martin 1965). Adult C. riparia are morphologically indistinguishable from adult C. flindersensis (Donnellan et al. 2012).
C. riparia and its sister species C. flindersensis are mostly easily distinguished morphologically by their tadpoles. C. riparia tadpoles are less rounded in shape, have a less arched tail fin, a longer tail, and a wider oral disc which is more adapted to fast flowing water (Donnellan et al. 2012).
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
Adult C. riparia are found beneath boulders and stones on the edges of rock-strewn creeks. Spawn is laid beneath rocks at the edge of creeks (Barker et al. 1995). The streams inhabited by C. riparia end to have steeper slopes, faster moving water, and less vegetation than the habitats of other Crinia species. The tadpoles are benthic grazers and are adapted to fast moving water, with a flattened body, low fins, and wide oral disc (Donnellan et al. 2012).
The tadpoles metamorphose in spring (from October to December), with a snout-vent length of 9.7-11.4 mm. Their morphology and coloration is that of a miniature adult, with a translucent grey venter (Donnellan et al. 2012).
Tadpole Coloration: C. riparia larvae range from golden brown (Horrock's Pass) to dark brown or black (Alligator Gorge) dorsally. The tadpoles have copper iridophores throughout the body, which increase in number as the larvae grows (Donnellan et al. 2012).
Trends and Threats
The original paper C. riparia by Littlejohn and Martin (1965) included specimens from the Northern Flinders Ranges as part of C. riparia. These are now identified as C. flindersensis, the Northern Flinders Ranges froglet, described in Donnellan et al. 2012.
C. riparia is most closely related to C. flindersensis. Other related species include C. signifera and C. parinsignifera (Donnellan et al. 2012).
Barker, J., Grigg, G. C., and Tyler, M. J. (1995). A Field Guide to Australian Frogs. Surrey Beatty and Sons, New South Wales.
Donnellan, S., Anstis, M., Price, L., and Wheaton, L. (2012). ''A new species of Crinia (Anura: Myobatrachidae) from the Flinders Ranges, South Australia.'' Zootaxa, 3499, 1-26.
Littlejohn, M. J. and Martin, A. A. (1965). ''A new species of Crinia (Anura: Leptodactylidae) from South Australia.'' Copeia, 3, 319-324.
Originally submitted by: Jean-Marc Hero et. al. (first posted 2002-04-05)
Edited by: Michelle S. Koo, Ambika Sopory, Jean-Marc Hero (2022-08-16)
Species Account Citation: AmphibiaWeb 2022 Crinia riparia: Southern Flinders Ranges Froglet <https://amphibiaweb.org/species/3561> University of California, Berkeley, CA, USA. Accessed Dec 6, 2022.
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Citation: AmphibiaWeb. 2022. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 6 Dec 2022.
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