What are ‘good species’?

Recently in TREE, Mallet [1,2], argued for an operational, concept-free definition of species as ‘genotypic clusters’, asserting ‘that species are man-made groupings’ [2]. However, Mallet resorts to the traditional notion of ‘good’ species for final arbitration regarding what degree of variation is appropriate for the species-level taxon. This is a poor species definition for two reasons. … Read more What are ‘good species’?

How many species are there?

An interesting research note just came out in the American Naturalist by Hamilton and colleagues entitled quantifying uncertainty in estimation of tropical arthropod species richness. I retweeted a Science Daily twitter feed on this that had a terribly misleading opening line: “New calculations reveal that the number of species on Earth is likely to be … Read more How many species are there?