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Lancet Fluke
''Dicrocoelium dendriticum'', the lancet liver fluke, is a parasite fluke that tends to live in cattle or other grazing mammals. History of discovery Much of what is presently known about ''Dicrocoelium dendriticum'' is the result of the work of the naturalist Wendell Krull. While ''D. dendriticum'' was discovered by Rudolphi in 1819 and ''D. hospes'' was discovered by Loos in 1899, the full life cycle was not known until Krull and C.R. Mapes published a series of papers from 1951-1953 detailing their observations and experiments. It was known that ''D. dendriticum'' affected sheep, but everything else was a mystery. The first link in the chain was the discovery of the first intermediate host, the land snail ''Cochlicopa lubrica'' (synonym: ''Cionella lubrica''). Next came the discovery that the slime balls coughed up by the snails could be a potential method of transfer of the parasite. Shortly thereafter, the ant ''Formica fusca'' was found to be the second intermediate h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
