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Hymenocephalus (fish)
''Hymenocephalus'' is a genus of rattails. Species There are currently 27 recognized species in this genus: * '' Hymenocephalus aeger'' C. H. Gilbert & C. L. Hubbs, 1920 (Plain-tail whiptail) * '' Hymenocephalus antraeus'' C. H. Gilbert & Cramer, 1897 * '' Hymenocephalus aterrimus'' C. H. Gilbert, 1905 (Blackest whiptail) * '' Hymenocephalus barbatulus'' C. H. Gilbert & C. L. Hubbs, 1920 * '' Hymenocephalus billsam'' N. B. Marshall & Iwamoto, 1973 * '' Hymenocephalus fuscus'' P. J. McMillan & Iwamoto, 2014 (Black membranehead) McMillan, P. & Iwamoto, T. (2014): Descriptions of four species of grenadier fishes of the genera ''Hymenocephalus'' and ''Hymenogadus'' (Teleostei, Gadiformes, Macrouridae) from the New Zealand region and Tasman Sea, including two new species of ''Hymenocephalus''. ''Zootaxa, 3856 (1): 117–134.'' * '' Hymenocephalus grimaldii'' M. C. W. Weber, 1913 * '' Hymenocephalus hachijoensis'' Okamura, 1970 * '' Hymenocephalus heterolepis'' ( Alcock, 188 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene was coined in 1854 by the German paleontologist Heinrich Ernst Beyrich from his studies of marine beds in Belgium and Germany. The name comes from the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major changes during the Oligocene included a global expansion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
