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Background Eurycea sosorum (Barton Springs salamander) and Eurycea nana (San Macros salamander) are listed as endangered and threatened species, respectively, by the U.S. Fish and Wildlife Service (USFWS) with habitats restricted to small regions near Austin, Texas, USA. The conservation efforts with the Eurycea salamanders at the captive breeding program in San Marcos Aquatic Resources Center (SMARC), a USFWS facility, have seen an unexpected and increased mortality rate over the past few years. The clinical signs of sick or dead salamanders included erythema, tail loss, asymmetric gills or brachial loss, rhabdomyolysis, kyphosis, and behavior changes, suggesting that an infectious disease might be the culprit. This study aimed to identify the cause of the infection, determine the taxonomic position of the pathogen, and investigate the potential reservoirs of the pathogen in the environment. Results Histopathological examination indicated microsporidian infection (microsporidiosis) in the sick and dead Eurycea salamanders that was later confirmed by PCR detection. We also determined the near full-length small subunit ribosomal RNA ( SSU rRNA) gene from the microsporidian pathogen, which allowed us to determine its phylogenetic position, and to design primers for specific and sensitive detection of the pathogen. Phylogenetic analysis indicated that this pathogen was closely related to the insect parasites Vavraia spp. and the human opportunistic pathogen, Trachipleistophora hominis . This Vavraia -like microsporidium was present in dead salamanders at SMARC archived between 2011 and 2015 (positive rates ranging between 52.0–88.9% by PCR detection), as well as in some aquatic invertebrates at the facility (e.g. snails and small crustaceans). Conclusions A Vavraia -like microsporidian was at least one of the major pathogens, if not solely, responsible for the sickness and mortality in the SMARC salamanders, and the pathogen had been present in the center for years. Environmental invertebrates likely served as a source and reservoir of the microsporidian pathogen. These observations provide new knowledge and a foundation for future conservation efforts for Eurycea salamanders including molecular surveys, monitoring of the pathogen, and discovery of effective treatments.

Amphibians of Costa Rica is the first in-depth field guide to all 206 species of amphibians known to occur in Costa Rica or within walking distance of its borders. A diminutive nation with abundant natural wealth, the country is host to 146 species of frogs and toads. Frogs of gemlike beauty and dizzying variety abound: some species can fit on the end of a human finger; others would take two hands to hold. In the rainforests, you can find frogs capable of gliding from high in the treetops to the forest floor, some that carry their eggs or their tadpoles around on their back, and others that secrete glue-like substances from their skin that are capable of sticking shut the mouth of attacking snakes. Costa Rica is also home to fifty-three species of lungless salamanders, whose unique adaptations and abilities have allowed them to colonize habitats inaccessible to other amphibians. In addition to the spectacularly diverse salamanders, frogs, and toads found in the country, this guide includes the caecilians-bizarre and highly specialized creatures that somewhat resemble giant worms. Author, photographer, and conservation biologist Twan Leenders has been studying the herpetofauna of Central America for more than twenty years. Leenders and his team of researchers have traipsed the rainforests, dry forests, and swamps of Costa Rica-toting portable photo studios-to put together the richest collection of photographs of Costa Rican herpetofauna known to exist. In addition to hundreds of photographs, range maps, morphological illustrations, and precise descriptions of key field characteristics,Amphibians of Costa Rica offers a wealth of natural history information, describing prey and predators, breeding strategies, habitat, and conservation status.

This chapter examines salamanders. It begins with mole salamanders, particularly the Western Tiger salamander. This species has a long history of being transported around the United States for all the wrong reasons: initially as fish bait, and presently as part of the pet trade. The effects of human-mediated dispersal and establishment of extralimital populations are evident today in hybrid swarming, species replacement, and confused biogeography. The chapter then looks at lungless salamanders, including the Seal salamander and the Southern two-lined salamander. The Seal salamander is not native to Arkansas. A population was detected in a spring in 2003 and reported in 2004; the colony was derived from northern Georgia in association with the bait market. The Southern two-lined salamander is native to eastern Illinois; however, it is exotic to McKee Creek, Brown County, and LaMoine River, McDonough County, in western Illinois.

We report the discovery of a single specimen of a small, terrestrial, lungless caecilian, the second known taxon of lungless caecilians. It differs from all other caecilians in lacking open external nares, and from the large aquatic lungless species described by Nussbaum & Wilkinson (Nussbaum, R. A. & Wilkinson, M. 1995 Proc. R. Soc. Lond. B 261, 331–335) in having no significant skull modifications. All modifications are of ‘soft morphology’ (covered external nares and choanae, lung and pulmonary vessel loss, etc.). A new genus and species are described to accommodate this form. Aspects of its skull and visceral morphology are described and considered in terms of the possible life history and evolution of the species, and compared with those of other lungless amphibians.