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Onychodactylus Sillanus
The genus ''Onychodactylus'', commonly known as clawed salamanders, is composed of three species, all endemic to eastern Asia. ''O. koreanus'' is found on the Korean peninsula, while ''O. fischeri'' is found in the Russian Far East and ''O. japonicus'' is found in Japan, on the islands of Shikoku and Honshū. All species are lungless with moderately developed parotoid gland The parotoid gland (alternatively, paratoid gland) is an external skin gland on the back, neck, and shoulder of some frogs (especially toads), and salamanders. It can secrete a number of milky alkaloid substances (depending on the species) known ...s. They inhabit moist, forested mountains near small rivers, streams, and lakes. Adults of each species can reach a length of 19 cm. Species Species recognized as of October 2023: References External links * eb application 2010. Berkeley, California''Onychodactylus'' AmphibiaWeb, available at http://amphibiaweb.org/. (Accessed: November 20, 2010). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onychodactylus Fischeri
''Onychodactylus fischeri'', also known as Fischer's clawed salamander or Russian clawed salamander, is a lungless salamander found in the Russian Far East. It was thought to have ranged throughout Northeast Asia, but this was based on paraphyletic species assignment, and the Chinese and Korean populations are now considered as distinct species. It has 78 chromosomes in total (27 pairs of microchromosome A microchromosome is a chromosome defined for its relatively small size. They are typical components of the karyotype of birds, some reptiles, fish, amphibians, and monotremes. As many bird genomes have chromosomes of widely different lengths, t ...s, six pairs of medium-sized chromosomes, and six pairs of large chromosomes). ''Onychodactylus fischeri'' is known to live at elevations up to 1000 m, and favors thickly-vegetated stretches of pebble-bottomed mountain streams, with little direct sunlight. It may also be found near underground springs. The mating season is fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Jakob Von Tschudi
Johann Jakob von Tschudi (25 July 1818 – 8 October 1889) was a Switzerland, Swiss naturalist, explorer, and diplomat. He is known for his travels in South America, his scientific contributions to zoology and anthropology, and his diplomatic service for Switzerland. Early life and education Tschudi was born in Glarus to Johann Jakob Tschudi, a merchant, and Anna Maria Zwicky. He studied natural sciences and medicine at the universities of Neuchâtel, Leiden, and Paris. Exploration and scientific work In 1838, Tschudi travelled to Peru, where he remained for five years exploring and collecting plants in the Andes. He moved to Vienna in 1843. In 1845, he described 18 new species of South American reptiles. Between 1857 and 1859, he visited Brazil and other countries in South America. Tschudi wrote a textbook on Peru titled ''Peruvian Antiquities'' in which he recorded various aspects of Peruvian life and history. In the book, he explained the various skull angles of Peruvians in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Korean Peninsula
Korea is a peninsular region in East Asia consisting of the Korean Peninsula, Jeju Island, and smaller islands. Since the end of World War II in 1945, it has been politically divided at or near the 38th parallel between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK). Both countries proclaimed independence in 1948, and the two countries fought the Korean War from 1950 to 1953. The region is bordered by China to the north and Russia to the northeast, across the Amnok (Yalu) and Duman (Tumen) rivers, and is separated from Japan to the southeast by the Korea Strait. Known human habitation of the Korean peninsula dates to 40,000 BC. The kingdom of Gojoseon, which according to tradition was founded in 2333 BC, fell to the Han dynasty in 108 BC. It was followed by the Three Kingdoms period, in which Korea was divided into Goguryeo, Baekje, and Silla. In 668 AD, Silla conquered Baekje and Goguryeo with the aid of the Tang dy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Russian Far East
The Russian Far East ( rus, Дальний Восток России, p=ˈdalʲnʲɪj vɐˈstok rɐˈsʲiɪ) is a region in North Asia. It is the easternmost part of Russia and the Asia, Asian continent, and is coextensive with the Far Eastern Federal District, which encompasses the area between Lake Baikal and the Pacific Ocean. The area's largest city is Khabarovsk, followed by Vladivostok. The region shares land borders with the countries of Mongolia, China, and North Korea to its south, as well as maritime boundary, maritime boundaries with Japan to its southeast, and with the United States along the Bering Strait to its northeast. Although the Russian Far East is often considered as a part of Siberia abroad, it has been historically categorized separately from Siberia in Russian regional schemes (and previously during the history of the Soviet Union, Soviet era when it was called the Soviet Far East). Terminology In Russia, the region is usually referred to as simply th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shikoku
is the smallest of the List of islands of Japan#Main islands, four main islands of Japan. It is long and between at its widest. It has a population of 3.8 million, the least populated of Japan's four main islands. It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include , , and , and its current name refers to the four former provinces of Japan, provinces that make up the island: Awa Province (Tokushima), Awa, Tosa Province, Tosa, Sanuki Province, Sanuki, and Iyo Province, Iyo. Geography Shikoku Island, comprising Shikoku and its surrounding islands, covers about and consists of four Prefectures of Japan, prefectures: Ehime Prefecture, Ehime, Kagawa Prefecture, Kagawa, Kōchi Prefecture, Kōchi, and Tokushima Prefecture, Tokushima. Across the Seto Inland Sea lie Wakayama Prefecture, Wakayama, Osaka Prefecture, Osaka, Hyōgo Prefecture, Hyōgo, Okayama Prefecture, Okayama, Hiroshima Prefecture, Hiroshima, and Yamaguchi Prefectures on Honshu. To th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honshū
, historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the seventh-largest island in the world, and the second-most populous after the Indonesian island of Java. Honshu had a population of 104 million , constituting 81.3% of the entire population of Japan, and mostly concentrated in the coastal areas and plains. Approximately 30% of the total population resides in the Greater Tokyo Area on the Kantō Plain. As the historical center of Japanese cultural and political power, the island includes several past Japanese capitals, including Kyōto, Nara, and Kamakura. Much of the island's southern shore forms part of the Taiheiyō Belt, a megalopolis that spans several of the Japanese islands. Honshu also contains Japan's highest mountain, Mount Fuji, and its largest lake, Lake Biwa. Most of Japan's industry is located in a belt running along Honshu's southern coast, from Tokyo to N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parotoid Gland
The parotoid gland (alternatively, paratoid gland) is an external skin gland on the back, neck, and shoulder of some frogs (especially toads), and salamanders. It can secrete a number of milky alkaloid substances (depending on the species) known collectively as bufotoxins, which act as neurotoxins to deter predation. These cutaneous glands are called parotoid as they are somewhat similarly positioned to mammalian parotid glands, parotid gland, although the latter have a different function, excreting saliva within the mouth rather than externally excreted defensive chemicals. A study of the parotoid glands of the Colorado River toad in 1976 found that the parotoid glands were "composed of numerous Lobe (anatomy), lobules", each of which is a separate unit with a Lumen (anatomy), lumen surrounded by a double cell layer. The cell layers have interlocking microvilli. The study found that the outer cell layer resembled smooth muscle cells, with some organelles hypothesised to "function ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
