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Scyllarides Tuberculatus
''Scyllarides'' is a genus of slipper lobsters. Characteristics ''Scyllarides'' is placed in the subfamily Arctidinae, which is differentiated from other subfamilies by the presence of multiarticulated exopods on all three maxillipeds, and a three-segmented palp on the mandible (arthropod), mandible. The only other genus in the subfamily, ''Arctides'', is distinguished by having a more highly sculptured carapace, with an extra spine behind each eye, and a transverse groove on the first segment of the abdomen. Taxonomic history In 1849, Wilhem de Haan divided the genus ''Scyllarus'' into two genera, ''Scyllarus'' and ''Arctus'', but made the error of including the type species of ''Scyllarus'' in the genus ''Arctus''. This was first recognised by the ichthyologist Theodore Gill in 1898, who Synonym (taxonomy), synonymised ''Arctus'' with ''Scyllarus'', and erected a new genus ''Scyllarides'' to hold the species that De Haan had placed in ''Scyllarus''. Species ''Scyllarides'' co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ypresian
In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the lower Eocene. Events The Ypresian Age begins during the throes of the Paleocene–Eocene Thermal Maximum (PETM). The Fur Formation in Denmark, the Messel shales in Germany, the Oise amber of France and Cambay amber of India are of this age. The Eocene Okanagan Highlands are an uplands subtropical to temperate series of lakes from the Ypresian. Stratigraphic definition The Ypresian Stage was introduced in scientific literature by Belgium, Belgian geologist André Hubert Dumont in 1850. The Ypresian is named after the Flanders, Flemish city of Ypres in Belgium (spelled ''Ieper'' in Dutch). The definitions of the original stage were totally different from the modern ones. The Ypresi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |