Field work by researcher Fred Kraus from Bishop Museum, Honolulu has found the world's smallest frogs in southeastern New Guinea. This also makes them the world's smallest tetrapods (non-fish vertebrates). The frogs belong to the genus Paedophryne, all of whose species are extremely small, with adults of the two new species - named Paedophryne dekot and Paedophryne verrucosa - only 8-9 mm in length. The study was published in the open access journal ZooKeys.
Previous research had led to the discovery of Paedophryne by Kraus in 2002 from nearby areas in New Guinea, but the genus was not formally described until last year (Kraus 2010, also in Zookeys). The two species described earlier were larger, attaining sizes of 10-11 mm, but the genus still represents the most miniaturized group of tetrapods in the world.
"Miniaturization occurs in many frog genera around the world," said the author, "but New Guinea seems particularly well represented, with species in seven genera exhibiting the phenomenon. Although most frog genera have only a few diminutive representatives mixed among larger relatives, Paedophryne is unique in that all species are minute." The four known species all inhabit small ranges in the mountains of southeastern New Guinea or adjacent, offshore islands. Their closest relatives remain unclear.
The members of this genus have reduced digit sizes that would not allow them to climb well; all inhabit leaf litter, and their reduced digits may be a corollary of a reduced body size required for inhabiting leaf litter and moss. Habitation in leaf litter and moss is common in miniaturized frogs and may reflect their exploitation of novel food sources in that habitat. The frogs' small body sizes have also reduced the egg complements that females carry to only two, although it is not yet known whether both eggs are laid simultaneously or at staged intervals.
Pensoft Publishers: http://www.pensoft.net
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
Megafauna like elephants and rhinos are ecological engineers, creating conditions that hundreds of other species have evolved to exploit. Losing their last remaining populations will radically alter life on Earth
Previously stable glaciers have been melting rapidly since 2009
With over 19,000 carcasses buried and more deaths expected officials are no closer to determining the cause of the catastrophe.
How do you check how many of the critically endangered fairy possums are still around? Talk to them, of course
A bloom of bioluminescent plankton has wowed crowds along a river in Southern Tasmania this week, but it could be a warning sign of climate change
During commencement speech at U.S. Coast Guard Academy, president says we must act now to reduce emissions - or else
A company official said the line was operating at full capacity when it broke, suggesting much more oil escaped than initially estimated
A new report predicts that widespread growth in wind power will put many migratory and endangered birds at risk
"This momentous decision marks the beginning of the end for dolphin hunting in Japan"
The bear is the original inspiration for the "Teddy Bear"