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Heleopera Nodosa
''Heleopera'' () is a genus of testate amoebae belonging to the order Arcellinida. It is the sole genus within family Heleoperidae and infraorder Volnustoma, which in turn belong to the suborder Glutinoconcha. It is characterized by a conspicuous slit-like test aperture. Description ''Heleopera'' is a genus of testate amoebae, a type of unicellular amoeboid protists that are enclosed in a shell known as the test. In particular, it belongs to the order Arcellinida, which includes testate amoebae with lobose (round, blunt-ended) pseudopods. The genus is characterized by an ovoid, laterally compressed test composed of a cancellated chitinoid membrane with a reticulate appearance of mostly dotted lines, often incorporating particles of sand. The test opening, or 'mouth', is large, elliptical and has a terminal position. Through this opening, the organism extends numerous digitiform pseudopods. The conspicuous slit-like (laterally compressed) terminal opening found in this genus i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Leidy
Joseph Mellick Leidy (September 9, 1823 – April 30, 1891) was an American paleontologist, parasitologist and anatomist. Leidy was professor of anatomy at the University of Pennsylvania, later becoming a professor of natural history at Swarthmore College and the director of scientific and educational programs at the Wagner Free Institute of Science. His book ''Extinct Fauna of Dakota and Nebraska'' (1869) contained many species not previously described and many previously unknown on the North American continent. At the time, scientific investigation was largely the province of wealthy amateurs. The Leidy Glacier in northwest Greenland was named by Robert Peary after him. Early life and family Joseph Leidy was born on September 9, 1823, to an established Philadelphia family of Pennsylvania Germans. His father, Philip, was a hatter; his mother, Catharine, died during childbirth when he was young. His father then married his wife's first cousin, Christiana Mellick. Leidy al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyletic
Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic grouping (a clade) includes a common ancestor and ''all'' of its descendants. The terms are commonly used in phylogenetics (a subfield of biology) and in the tree model of historical linguistics. Paraphyletic groups are identified by a combination of synapomorphies and symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term received currency during the debates of the 1960s and 1970s accompanying the rise of cladistics, having been coined by zoologist Willi Hennig to apply to well-known taxa like Reptilia (reptiles), which is paraphyletic with respect to birds. Reptilia contains the last common ancestor of reptiles and all descendants of that ancestor exc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Revue Suisse De Zoologie
The ''Revue suisse de Zoologie'' (English: ''Swiss Journal of Zoology'') is a biannual peer-reviewed scientific journal for zoological systematics. It is published by the Natural History Museum of Geneva (Switzerland). It is financed by the Swiss Academy of Natural Sciences (SCNAT) and the City of Geneva, and mainly publishes the research results of Swiss researchers or work based on the collections of Swiss institutions. Abstracting and indexing The journal is abstracted and indexed in: *BIOSIS Previews *CAB Abstracts *Science Citation Index Expanded *Scopus Scopus is a scientific abstract and citation database, launched by the academic publisher Elsevier as a competitor to older Web of Science in 2004. The ensuing competition between the two databases has been characterized as "intense" and is c ... References External links * * * Zoology journals Biannual journals English-language journals Academic journals established in 1893 Academic journals associated with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heleopera Sylvatica
''Heleopera'' () is a genus of testate amoebae belonging to the order Arcellinida. It is the sole genus within family Heleoperidae and infraorder Volnustoma, which in turn belong to the suborder Glutinoconcha. It is characterized by a conspicuous slit-like test aperture. Description ''Heleopera'' is a genus of testate amoebae, a type of unicellular amoeboid protists that are enclosed in a shell known as the test. In particular, it belongs to the order Arcellinida, which includes testate amoebae with lobose (round, blunt-ended) pseudopods. The genus is characterized by an ovoid, laterally compressed test composed of a cancellated chitinoid membrane with a reticulate appearance of mostly dotted lines, often incorporating particles of sand. The test opening, or 'mouth', is large, elliptical and has a terminal position. Through this opening, the organism extends numerous digitiform pseudopods. The conspicuous slit-like (laterally compressed) terminal opening found in this genus i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
