Marine taxonomy changes yearly. A verified PDF should be no older than 5–7 years, or it must state it is a “reprinted classic.”
The best guides include a dedicated matrix for "Look but don't touch" species: Cone shells, Stonefish, Flower urchins, and Sea snakes.
A verified guide organizes life into logical groups. Here are the key categories your PDF should cover:
Use combinations like:
Include terms like "field guide", "identification", "atlas", "PDF", and the specific taxon (e.g., "reef fish", "corals", "molluscs", "crustaceans", "echinoderms").
Verified PDFs will have a Digital Object Identifier (DOI) or ISBN number. If it’s missing, the document is likely unverified.
Before opening, upload the file to VirusTotal.com to ensure no embedded malware.
