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Cambarus Diupalma
''Cambarus'' is a large and diverse genus of crayfish from the United States and Canada. The adults range in size from about 5 centimeters (2 in) up to approximately 15 centimeters (6 in). Description The genus ''Cambarus'' is the second largest freshwater crayfish genus inhabiting the Northern Hemisphere, with only sixty fewer species than the genus ''Procambarus''. Though ''Cambarus'' are varied across species, the two terminal elements that make up the male form I gonopod form ninety degree angles with the central appendage, allowing for their identification. Unlike the genus ''Procambarus'' whose first pleopod tends to have three processes at the tip, ''Cambarus'' has only one or two. ''Cambarus'' reach 17–26 mm carapace lengths in their first year, while average adult carapace length ranges from 55–62 mm. As a genus containing nearly 100 species, ''Cambarus's'' coloration is variable. ''Cambarus bartonii'' is dark brown, while species like ''Cambar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wilhelm Ferdinand Erichson
Dr Wilhelm Ferdinand Erichson (26 November 1809 in Stralsund – 18 December 1848 in Berlin) was a trained medical doctor and a German entomologist. He was the author of many articles about insects mainly in ''Archiv für Naturgeschichte''. When writing in Latin, he latinised ''Wilhelm'' to ''Guillelmus'' becoming either ''Guil. F. Erichson'' or ''G.F. Erichson.'' He wrote a paper in 1842 on insect species collected at Woolnorth in Tasmania, Australia, which was the first detailed research published on the biogeography of Australian animals and was very influential in raising scientific interest in Australian fauna. Erichson was the curator of the Coleoptera collections at the ''Museum fur Naturkunde'' in Berlin from 1834 to 1848. Erichson's Scarabaeidae classification is nearly identical to the modern one. Works *''Genera Dytiscorum''. Berlin (1832) *''Die Käfer der Mark Brandenburg''. Two volumes Berlin (1837-1839) Click for pd*''Genera et species Staphylinorum insectorum'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
