Holbrook's southern dusky salamander | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Amphibia |
Order: | Urodela |
Family: | Plethodontidae |
Subfamily: | Plethodontinae |
Genus: | Desmognathus |
Species: | D. auriculatus |
Binomial name | |
Desmognathus auriculatus (Holbrook, 1838) | |
Synonyms | |
Holbrook's southern dusky salamander (Desmognathus auriculatus), previously known as the southern dusky salamander, is a species of salamander endemic to the southeastern United States. Older sources often refer to it as the eared triton. [2] Formerly abundant, it has precipitously declined since the 1960s. [3]
As previously defined as the southern dusky salamander, it was thought to range from southern Virginia south to Florida, and west to Texas. However, a 2008 study found D. auriculatus as previously defined to be polyphyletic, with many populations being assigned to this species on the basis of similar morphology; for example, Texas populations were found to belong to the spotted dusky salamander (D. conanti). Several other populations assigned to this species were found to be northern dusky salamander (D. fuscus), D. conanti, or undescribed species. [2] [4] In 2017, one of these species was described as Valentine's southern dusky salamander (D. valentinei). [5] A 2020 study identified three distinct mito-nuclear lineages that likely represented distinct species: D. auriculatus A (D. auriculatus sensu stricto), D. auriculatus B, and D. auriculatus C. [6] [7]
It was described by John Edwards Holbrook and renamed after him in 2017 to distinguish it from D. valentinei. [5]
Desmognathus fuscus carri was a subspecies of the northern dusky salamander thought to have existed in peninsular Florida prior to its unexplained disappearance in the 1970s. A 2021 phylogenetic analysis found it to belong to D. auriculatus sensu stricto, albeit being a distinct genetic lineage of it. [7]
The three lineages presently assigned to D. auriculatus range along the Atlantic coastal plain from southern Virginia south to peninsular Florida, and west to the Florida Panhandle and southern Alabama. However, populations from Virginia south to Georgia are now thought to belong to the distantly related lineages D. auriculatus B and D. auriculatus C, representing undescribed species. [6] [7] D. auriculatus A, the "true" D. auriculatus, ranges from southern Georgia south to peninsular Florida, and west to the Florida Panhandle and southern Alabama. [2] [5]
Holbrook's southern dusky salamander grows from 3 to 6 inches in length. It is typically dark brown to black in color, with a long tail, and rear legs which are noticeably larger than its front legs. [5]
Holbrook's southern dusky salamander prefers tannic, swampy areas near ponds or on the flood plain of streams and rivers. It is largely nocturnal. Breeding takes place in the fall months, and females lay eggs in moist, sheltered areas of ground debris. [5]
The "true" D. auriculatus, D. auriculatus A, was formerly abundant but has experienced major, unexplained declines since the late 1960s to 1970s, disappearing from large areas of optimal, undisturbed habitat. They are now found in less than 1 percent of their former range. Although it persists at several sites in southern Georgia and northern Florida, it has seemed to have disappeared entirely from peninsular Florida. The exact causes of these declines remain unknown, as other salamanders inhabiting the areas, including other Desmognathus species, have not seen the same declines experienced by D. auriculatus. [7] [3]
The southeasterndwarf salamander, formerly known as the dwarf salamander, is a species of salamander native to the southern United States, ranging primarily from southern North Carolina south to northern Florida, with some populations from southwestern Alabama to eastern Louisiana. Some sources refer to it as the four-fingered manculus, dwarf four-toed salamander, or the Florida dwarf salamander.
The seepage salamander is a small, terrestrial species of salamander in the family Plethodontidae. It is endemic to the United States. They are found in small areas of Tennessee, North Carolina, Georgia, and Alabama. Its natural habitats are temperate forests, intermittent rivers, and freshwater springs. It gets its name from the seepages around which it lives. It is very similar in its appearance and life history to the pygmy salamander. These two species differ greatly from the other Desmognathus species. They are the smallest salamanders in the genus, measuring only 3–5 cm (1–2 in) in length. They are also the only two terrestrial, direct-developing Desmognathus species. However, the two species are not often seen to coexist, differing in distribution by elevation; although there are exceptions. The seepage salamander is currently listed as Near Threatened, with its numbers declining in most of states in which it is found. It is threatened by habitat loss, with logging having a major effect.
The Apalachicola dusky salamander is a species of salamander in the family Plethodontidae. It is threatened by habitat loss.
Desmognathus fuscus is a species of amphibian in the family Plethodontidae. The species is commonly called the dusky salamander or northern dusky salamander to distinguish it from populations in the southern United States which form several distinct species, the southern dusky salamanders. The northern dusky salamander is the most widespread representative of its genus in Canada. It can be found in eastern North America from extreme eastern Canada in New Brunswick south to South Carolina. The size of the species' total population is unknown, but is assumed to easily exceed 100,000. The species' habitat differs somewhat geographically; dusky salamanders in the northern part of the range prefer rocky woodland streams, seepages, and springs, while those in the south favor floodplains, sloughs, and muddy places along upland streams. They are most common where water is running or trickling. They hide under various objects, such as leaves or rocks, either in or near water. Alternatively, they may enter burrows for protection. The dusky salamander lays its eggs close to water under moss or rocks, in logs, or in stream-bank cavities. The larval stage which follows is normally aquatic.
The Allegheny Mountain dusky salamander is a species in the Plethodontidae family native to eastern North America.
The ocoee salamander is a species of salamander in the family Plethodontidae. This salamander has a variety of colors and patterns, and got its name from Tennessee state wildflower. Its natural habitats are temperate forests, rivers, intermittent rivers, freshwater springs and wet rocks in mountainous areas of the Southeastern United States. It was first described by Nicholls in 1949. They are territorial and feed on small invertebrates. It is widely distributed in the southeastern United States and is listed as "Least Concern" by the International Union for Conservation of Nature.
The blackbelly salamander is a species of salamander in the family Plethodontidae. It is endemic to the United States. Its natural habitats are rivers, intermittent rivers, and freshwater springs. It is threatened by habitat loss.
The pygmy salamander is a species of salamander in the family Plethodontidae. It is endemic to the United States in the southern Appalachians in North Carolina and Tennessee. Desmognathus wrighti is a member of the family Plethodontidae and is commonly known as the pygmy salamander. As the name suggest the pygmy salamander is the smallest of the nineteen species in the genus Desmognathus. D. wrighti undergoes direct development and does not have a free-living larval stage. Only two other taxa in Desmognathus, D. aeneus and D. organi, exhibit direct development along with the pygmy salamander. In the genus Desmognathus, body size, habitat preferences, and patterns used by males during courtship are quite variable. D. wrighti courtship is noted by the male biting and seizing its partner in order to provide them with a chemical stimulus. The pygmy salamander can be found in the southern Appalachians of the United States in western North Carolina and eastern Tennessee. Geographical distribution of the Desmognathus wrighti is fragmented and the highest abundance of the species can be found at high elevations in spruce and fir tree forest.
The many-lined salamander is a species of salamander in the family Plethodontidae. It is the only species of the monotypic genus Stereochilus. It is endemic to the United States.
Valentine's southern dusky salamander is a species of salamander in the family Plethodontidae. It is endemic to the southeastern United States.
The spotted dusky salamander is a species of salamander in the family Plethodontidae. It is endemic to the United States.
The flat-headed salamander is a species of salamander in the family Plethodontidae. It is endemic to the United States, where it is known from Virginia and likely North Carolina.
The Cherokee black-bellied salamander or Smoky Mountains black-bellied salamander is a species of lungless salamander in the family Plethodontidae. It is endemic to the eastern United States, where it is only known from the southern Appalachian Mountains.
The Pisgah black-bellied salamander or Blue Ridge black-bellied salamander is a species of lungless salamander in the family Plethodontidae. It is endemic to the eastern United States, where it is only known from the southern Appalachian Mountains.
The Talladega seal salamander is a mid-sized stream-dwelling plethodontid salamander native to the Southeastern United States. This species was split from the common seal salamander in 2022.
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