Tuesday , December 18 2018

Reticulated Siren: New Salamander Species Discovered

A team of researchers has discovered a new species of salamander living in Alabama and the Panhandle region of Florida, the United States.

A reticulated siren (Siren reticulata) from the waters of northwestern Florida (Okaloosa County) rests on an aquarium floor. Image credit: Pierson Hill.

A reticulated siren (Siren reticulata) from the waters of northwestern Florida (Okaloosa County) rests on an aquarium floor. Image credit: Pierson Hill.

The newly-discovered salamander species belongs to Sirenidae (sirens), a family of completely aquatic, eel-like salamanders with an unusual morphology: large external gills and only front limbs.

The ancestors of these amphibians likely branched off from all other salamanders early in the evolution of this group.

Although sirens ranged through North America, South America, and Africa during the Cretaceous period, the family is now largely restricted to the southern United States and northeastern Mexico, where they have been present since the late Eocene epoch.

Named the reticulated siren (Siren reticulata), the new species lives in the vulnerable biodiversity hotspot of southern Alabama and northwestern Florida and is the first new species of siren to be described in 44 years.

“To date this species is only confirmed from three localities,” Sul Ross State University’s Dr. Sean Graham and co-authors.

“The type locality is a shallow freshwater marsh associated with Lake Jackson, a large freshwater limesink lake that straddles the border between Florida and Alabama, near the town of Florala, Alabama.”

“The second site is a beaver-impounded clearwater stream and associated bay swamp on Eglin Air Force Base, Okaloosa County, Florida.”

“Finally, the Fish River locality is a blackwater stream and associated bottomland forest in Baldwin County, Alabama.”

A reticulated siren (Siren reticulata) from Walton County, northwestern Florida. Image credit: Pierson Hill.

A reticulated siren (Siren reticulata) from Walton County, northwestern Florida. Image credit: Pierson Hill.

The reticulated siren is genetically distinct from all currently-recognized species and subspecies of sirens.

This amphibian is very large (maximum known size nearly 24 inches, or 60 cm), making it among the largest vertebrates described from the United States in over 100 years.

“It was thrilling to be a part of this discovery team,” Dr. Graham said.

“Not only did we get to meet such an interesting new species, but we got another reminder that the book of life still has a lot of pages for us to fill.”

A detailed description of the reticulated siren appears in the December 5, 2018 online edition of the journal PLoS ONE.

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S.P. Graham et al. 2018. Description of an extant salamander from the Gulf Coastal Plain of North America: The Reticulated Siren, Siren reticulata. PLoS ONE 13 (12): e0207460; doi: 10.1371/journal.pone.0207460

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