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The word genus here is used in a philosophical sense but we have co-opted it for use as one of many ranks in the Linnean system . That system provides two names for a species - - a family name ( generic name or genus name ) , which always has a capital letter as the first letter , and a personal name ( specific name ) , which is always in lower case letters . The genus database contains nomenclatural information such as genus name , authorship , reference , page , type and author of typification ( if applicable ) . Without magnification this key may be used to identify organisms to one of the major groups of macroinvertebrates such as mayflies , stoneflies , caddisflies , beetles , fly larvae , etc. With a stereo microscope having a magnification range between 7x to 30x , organisms may be identified to a lower taxonomic level such as family or genus . There are many fascinating connections here between Galois module structure and classical topics such as genus field , central class field , and sign of the fundamental unit in a quadratic field . with a detailed list of the genus , or genus species , or the common name and variety of each type of tree , vine , plant , or shrub . Tetraselmis is an ancestral genus , with many of the morphological features of the " prasinophyte " grade of basally-derived green plants . Substantial form : a form which constitutes a nature , i.e. a species or genus . Nowadays , the genus Strychnos created by Linnaeus in 1753 is the numerically most important genus from the Loganiaceae family and comprises 196 species growing in the warm regions of Asia ( 58 species ) , America ( 64 ) and Africa ( 75 ) .