deletions | additions       diff --git a/Another_challenge_presented_by_the__.md b/Another_challenge_presented_by_the__.md  index b19c57d..51ac3de 100644  --- a/Another_challenge_presented_by_the__.md  +++ b/Another_challenge_presented_by_the__.md 
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Another challenge presented by the taxonomic literature is that it is highly decentralised, being spread across numerous journals [fig]. What is striking is the dominance of animal taxonomy by the "megajournal" Zootaxa, and yet this journal has published only 15% of the new names that have been minted since 2000. The taxonomic literature has a very "long tail" of small, often obscure journals that contain a few taxonomic publications. Individually each journal in the tail contains little taxonomic information, collectively they contain the bulk [nee dot quantify this]. Long tails require significant effort to index \cite{edwards_thorne_1993}, although the Zoological Record claims 90% coverage \cite{thorne_2003}, in some taxa there may be significantly greater gaps \cite{bouchet_rocroi_1992}. It also presents a considerable challenge to digitisation efforts such as BHL, which achieves economies of scale by scanning and indexing whole volumes, rather than trying to extract individual articles for digitisation. After scanning the obvious "low hanging fruit" of journals that have published many taxonomic descriptions, we face the daunting prospect of scanning many thousands of volumes for relatively low return. [could we quanitfy how many journals need to be scanned to get x names?]  The picture that emerges from our knowledge of the taxonomic literature is the recent literature is mostly digital, identified with DOIs, and some of it Open Access. But much of our fundamental knowledge of the world's biodiversity, particularly that published in the mid to late 20th century remains digitally inaccessible. Between the recent trend towards digitisation and openness, and the removal of restrictions pre-1923 as copyright expires expires, there  lies a great body of work that will require considerable effort to make available.