Saddleback toad

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Saddleback toads
Brachycephalus ephippium01.jpg
Spix’s saddleback toad, Brachycephalus ephippium
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Suborder: Neobatrachia
Family: Brachycephalidae
Günther, 1858
Genus: Brachycephalus
Fitzinger, 1826
Species

See text

BRACHYCEPHALIDAE range.PNG
Distribution of Brachycephalus (in black)

The saddleback toads are the family Brachycephalidae /ˈbræksɛˈfæld/ in the order Anura. As traditionally defined, the family is often limited to just one genus, Brachycephalus, but it is closely related to Ischnocnema, which therefore is placed in the family in recent treatments.[1][2] Brachycephalus species are tiny, often yellow frogs that are native to Atlantic Forest in southeastern Brazil. In at least one species, B. ephippium, the bright colours are aposematic, warning potential predators of its toxicity, specifically tetrodotoxin.[3]

Brachycephalus species are very small frogs, up to 1.8 cm (0.71 in) in length (mostly around 1 cm or 0.39 in), and include the smallest frog in the Southern Hemisphere, Izecksohn's toad (Brachycephalus didactylus).[4] They have only three toes on each foot, and two fingers on each hand. This is in contrast to the usual five toes and four fingers of most frogs.

Brachycephalus species are active during the day, and live in the leaf litter on forest floors. The eggs undergo direct development, hatching into miniature frogs, without a tadpole stage.[4] The eggs are laid on the ground, and covered in soil to protect them from the heat and predators. Their amplexus method is unusual, in that it begins with inguinal amplexus, with the male holding the female around the waist, and then shifts to axillary amplexus, in which the male grips above the female's arms. Most frogs species only use one technique.

Reported May 2015, seven new species have been discovered in Brazil's Atlantic rain forest in the states of Paraná and Santa Catarina, in southern Brazil.[5] Most species of Brachycephalus are only found on one, or a few, mountaintops in the Brazilian cloud forests. These species tend to be isolated on the mountaintops, by valleys with habitat and temperatures, not suited to the frogs, which the frogs cannot cross, forming isolated populations of the species on sky island mountaintops.

The first Brachycephalus species was identified in 1824, but most of the frog species were discovered since the year 2000. The discovery of new frog species is difficult. Field work requires climbing steep mountain trails to the sites where the frogs live.

The frogs are restricted to cloud forests on one or a few nearby mountaintops, making the frogs vulnerable to extinction. Cloud forests are sensitive to climate changes and face threats from deforestation for pine tree plantations and cattle ranching.[6]

Classification[edit]

Family BRACHYCEPHALIDAE

References[edit]

  1. ^ AmphibiaWeb (2013). Brachycephalidae. Retrieved 29 January 2013
  2. ^ Hedges, S. B., Duellman, W. E., and Heinicke, M. P (2008). "New World direct-developing frogs (Anura: Terrarana): Molecular phylogeny, classification, biogeography, and conservation" (PDF). Zootaxa 1737: 1–182. 
  3. ^ Pires Jr., Sebbena, Schwartza, Larguraa, Bloch Jr., Moralesa, and Schwartza (2002). Occurrence of tetrodotoxin and its analogues in the Brazilian frog Brachycephalus ephippium (Anura: Brachycephalidae). Toxicon 40(6): 761-766
  4. ^ a b Zweifel, Richard G. (1998). Cogger, H.G.; Zweifel, R.G., eds. Encyclopedia of Reptiles and Amphibians. San Diego: Academic Press. p. 103. ISBN 0-12-178560-2. 
  5. ^ "Seven new microendemic species of Brachycephalus (Anura: Brachycephalidae) from southern Brazil". Retrieved 2015-06-05. 
  6. ^ Bates, Mary; 04, National Geographic PUBLISHED June. "Seven New Mini-Frogs Found—Among Smallest Known". National Geographic News. Retrieved 2015-06-05. 
  7. ^ Amphibian Species of the World (2015)
  8. ^ a b c d e f g h Webb, Jonathan. "Seven tiny frog species found on seven mountains". BBCNews. BBCNews. Retrieved 4 June 2015. 
  9. ^ a b c d e f g h Ribeiro, Luiz F.; Bornschein, Marcos R.; Belmonte-Lopes, Ricardo; Firkowski, Carina R.; Morato, Sergio A.A.; Pie, Marcio R. (2015). "Seven new microendemic species of Brachycephalus(Anura: Brachycephalidae) from southern Brazil". PeerJ 3: e1011. doi:10.7717/peerj.1011. ISSN 2167-8359. 
  10. ^ Napoli, M.F.; Caramaschi, U.; Cruz, C.A.G.; Dias, I.R. (2011). "A new species of flea-toad, genus Brachycephalus Fitzinger (Amphibia: Anura: Brachycephalidae), from the Atlantic rainforest of southern Bahia, Brazil". Zootaxa 2739: 33–40. doi:10.11646/zootaxa.2739.1.3. 
  11. ^ Condez, T.H.; Monteiro, J.P.D.; Comitti, E.J.; Garcia, P.C.A.; Amaral, I.B.; Haddad, C.F.B. (2016). "A new species of flea-toad (Anura: Brachycephalidae) from southern Atlantic Forest, Brazil". Zootaxa 4083 (1): 40–56. doi:10.11646/zootaxa.4083.1.2. 
  12. ^ Garey, Michel V.; Lima, André M. X.; Hartmann, Marília T.; Haddad, Célio F. B. (2012). "A new species of miniaturized toadlet, genus Brachycephalus (Anura: Brachycephalidae), from southern Brazil". Herpetologica 68 (2): 266–271. doi:10.1655/herpetologica-d-11-00074.1. Retrieved 4 June 2015.