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Batrachochytrium Salamandrivorans
''Batrachochytrium salamandrivorans'' (''Bsal'') is a pathogenic chytrid fungus that infects amphibian species. Although salamanders and newts seem to be the most susceptible, some anuran species are also affected. ''Bsal'' has emerged recently and poses a major threat to species in Europe and North America. It was described in 2013 based on a strain collected from skin tissue of fire salamanders '' Salamandra salamandra''. The pathogen, unidentified up to then, had devastated fire salamander populations in the Netherlands. Molecular phylogenetics confirmed it as related to the well known chytrid '' B. dendrobatidis''. Like this species, it causes chytridiomycosis, which is manifested in skin lesions and is lethal for the salamanders. Damage to the epidermal layer can be extensive and may result in osmoregulatory issues or sepsis. Another study estimated that this species had diverged from ''B. dendrobatidis'' in the Late Cretaceous or early Paleogene. While initial susce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pathogenic
In biology, a pathogen ( el, πάθος, "suffering", "passion" and , "producer of") in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term ''pathogen'' came into use in the 1880s. Typically, the term ''pathogen'' is used to describe an ''infectious'' microorganism or agent, such as a virus, bacterium, protozoan, prion, viroid, or fungus. Small animals, such as helminths and insects, can also cause or transmit disease. However, these animals are usually referred to as parasites rather than pathogens. The scientific study of microscopic organisms, including microscopic pathogenic organisms, is called microbiology, while parasitology refers to the scientific study of parasites and the organisms that host them. There are several pathways through which pathogens can invade a host. The principal pathways have different episodic time frames, but soil has the longest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sword-tailed Newt
The sword-tail newt, sword-tailed newt, yellow-bellied newt, or Okinawa newt (''Cynops ensicauda'') is a species of true salamander from the Ryukyu Archipelago in Japan. It has recently been placed on Japan's Red List of Threatened Amphibians. Sword-tail newts are poisonous, and may also be referred to as fire-bellied newts due to the orange coloration of their underside. They are not to be confused with the common Chinese and Japanese species. It is distinguished from these two species by their larger size, broader heads and smoother skin. Its coloration ranges from brown to black, occasionally with an orange dorsal stripe. Some individuals may have light spotting or speckling on their backs. Sword-tailed newts can reach in males and in females. They are the largest living members of their genus. They exhibit sexual dimorphism. Females’ tails are longer than the rest of their body; those of males are much shorter, and sometimes display a whitish sheen during breeding seaso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vector (epidemiology)
In epidemiology, a disease vector is any living agent that carries and transmits an infectious pathogen to another living organism; agents regarded as vectors are organisms, such as parasites or microbes. The first major discovery of a disease vector came from Ronald Ross in 1897, who discovered the malaria pathogen when he dissected a mosquito. Arthropods Arthropods form a major group of pathogen vectors with mosquitoes, flies, sand flies, lice, fleas, ticks, and mites transmitting a huge number of pathogens. Many such vectors are haematophagous, which feed on blood at some or all stages of their lives. When the insects feed on blood, the pathogen enters the blood stream of the host. This can happen in different ways. The '' Anopheles'' mosquito, a vector for malaria, filariasis, and various arthropod-borne-viruses ( arboviruses), inserts its delicate mouthpart under the skin and feeds on its host's blood. The parasites the mosquito carries are usually located in its sal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudotriton Ruber
The red salamander (''Pseudotriton ruber'') is a species of salamander in the family Plethodontidae endemic to the eastern United States. Its skin is orange/red with random black spots. Its habitats are temperate forests, small creeks, ponds, forests, temperate shrubland, rivers, intermittent rivers, freshwater, trees springs. Overall this species is common and widespread, but locally it has declined because of habitat loss and it is considered threatened in Indiana. Red salamanders eat insects, earthworms, spiders, small crustaceans, snails and smaller salamanders. The red salamander, as a member of the family Plethodontidae (lungless salamanders), lacks lungs and respires through its skin. Description ''Pseudotriton ruber'' is a medium-large salamander, with adults ranging from in total length. Its sides and back vary in color from an orange-brownish tint to a bright red depending on its age. Like other salamanders, the red salamander seems to lose its color as it ages, becom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurycea Wilderae
The Blue Ridge two-lined salamander (''Eurycea wilderae'') is a species of salamander in the family Plethodontidae, endemic to the United States. This species is found in the southern Appalachian Mountains, mostly south of Virginia. To the north is a similar salamander, ''Eurycea bislineata'', or the northern two-lined salamander. Its genus, ''Eurycea'' contains 33 species and includes taxa that have either a metamorphic life cycle or larval-form paedomorphosis. In species that metamorphose, there can be within-and among-population variation in larval life-history characteristics, e.g., duration of the larval period and size at metamorphosis. Intraspecific geographic variation in species of ''Eurycea'' has been attributed to several factors: temperature, stream order and productivity of the larval habitat. Adult Blue Ridge two-lined salamanders are commonly found near stream banks. The larvae are aquatic, living in streams and seeps. Its natural habitats are temperate forests, ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notophthalmus Viridescens
The eastern newt (''Notophthalmus viridescens'') is a common newt of eastern North America. It frequents small lakes, ponds, and streams or nearby wet forests. The eastern newt produces tetrodotoxin, which makes the species unpalatable to predatory fish and crayfish. It has a lifespan of 12 to 15 years in the wild, and it may grow to in length. These animals are common aquarium pets, being either collected from the wild or sold commercially. The striking bright orange juvenile stage, which is land-dwelling, is known as a red eft. Some sources blend the general name of the species and that of the red-spotted newt subspecies into the eastern red-spotted newt (although there is no "western" one). Subspecies The eastern newt includes these four subspecies: *Red-spotted newt (''Notophthalmus viridescens viridescens'') *Broken-striped newt (''Notophthalmus viridescens dorsalis'') *Central newt (''Notophthalmus viridescens louisianensis'') - Central newts measure from to in lengt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cynops Pyrrhogaster
The Japanese fire-bellied newt or Japanese fire-bellied salamander (''Cynops pyrrhogaster'') is a species of newt endemic to Japan. The skin on its upper body is dark, while its lower regions are bright red, although coloration varies with age, genetics, and region. Adults are long. To deter predators, Japanese fire-bellied newts contain high levels of tetrodotoxin, a neurotoxin which is accumulated mainly from their diet. They are found on many Japanese islands, including Honshu, Shikoku, and Kyushu. Their habitats include both natural and artificial bodies of water, as well as forests and grasslands. They breed from spring to the beginning of summer, both sexes producing pheromones when ready to mate. Eggs are laid separately, hatching after about three weeks. They grow from larval to juvenile form in between five and six months. Juveniles eat soil-dwelling prey, while adults eat a wide variety of insects, tadpoles, and the eggs of their own species. They have multiple a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taricha Granulosa
The rough-skinned newt or roughskin newt (''Taricha granulosa'') is a North American newt known for the strong toxin exuded from its skin. Appearance A stocky newt with rounded snout, it ranges from light brown to olive or brownish-black on top, with the underside, including the head, legs, and tail, a contrasting orange to yellow. The skin is granular, but males are smooth-skinned during breeding season. They measure 6 to 9 cm in snout-to-vent length, and 11 to 18 cm overall. They are similar to the California newt (''Taricha torosa'') but differ in having smaller eyes, yellow irises, V-shaped tooth patterns, and uniformly dark eyelids. Males can be distinguished from females during breeding season by large swollen vent lobes and cornified toe pads. Distribution and subspecies Habitats of rough-skinned newts are found throughout the Pacific Northwest. Their range extends south to Santa Cruz, California, and north to Alaska. They are uncommon east of the Cascade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zoospore
A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Diversity Flagella types Zoospores may possess one or more distinct types of flagella - tinsel or "decorated", and whiplash, in various combinations. *Tinsellated (straminipilous) flagella have lateral filaments known as mastigonemes perpendicular to their main axis, which allow for more surface area, and disturbance of the medium, giving them the property of a rudder, that is, used for steering. *Whiplash flagella are straight, to power the zoospore through its medium. Also, the "default" zoospore only has the propelling, whiplash flagella. Both tinsel and whiplash flagella beat in a sinusoidal wave pattern, but when both are present, the tinsel beats in the opposite direction of the whiplash, to give two axes of control of motility. Morphological types In eukaryotes, the four main ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salamander
Salamanders are a group of amphibians typically characterized by their lizard-like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped together under the order Urodela. Salamander diversity is highest in eastern North America, especially in the Appalachian Mountains; most species are found in the Holarctic realm, with some species present in the Neotropical realm. Salamanders rarely have more than four toes on their front legs and five on their rear legs, but some species have fewer digits and others lack hind limbs. Their permeable skin usually makes them reliant on habitats in or near water or other cool, damp places. Some salamander species are fully aquatic throughout their lives, some take to the water intermittently, and others are entirely terrestrial as adults. This group of amphibians is capable of regenerating los ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urodela
Salamanders are a group of amphibians typically characterized by their lizard-like appearance, with slender bodies, blunt snouts, short limbs projecting at right angles to the body, and the presence of a tail in both larvae and adults. All ten extant salamander families are grouped together under the order Urodela. Salamander diversity is highest in eastern North America, especially in the Appalachian Mountains; most species are found in the Holarctic realm, with some species present in the Neotropical realm. Salamanders rarely have more than four toes on their front legs and five on their rear legs, but some species have fewer digits and others lack hind limbs. Their permeable skin usually makes them reliant on habitats in or near water or other cool, damp places. Some salamander species are fully aquatic throughout their lives, some take to the water intermittently, and others are entirely terrestrial as adults. This group of amphibians is capable of regenerating lost limb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fire Belly Newts
The fire belly newt or fire newt is a genus (''Cynops'') of newt A newt is a salamander in the subfamily Pleurodelinae. The terrestrial juvenile phase is called an eft. Unlike other members of the family Salamandridae, newts are semiaquatic, alternating between aquatic and terrestrial habitats. Not all aqua ...s native to Japan and China. All of the species show bright yellow or red bellies, but this feature is not unique to this genus. Their skin contains a toxin that can be harmful if ingested. Species Species recognized as of October 2019: (A * means that the newt has been moved into the genus ''Hypselotriton'' in some classifications ) Taxonomic controversy The genus ''Cynops'' has been suggested to be due for a split, with the Chinese species being placed in a separate genus from the Japanese ones. The species '' Cynops cyanurus'' is at the centre of all this. There is much debate about the validity of ''C. cyanurus'' and '' C. chenggongensis''. All the known capt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
