Here’s a word of the day for you: Teuthology. What does it mean? It’s the study of cephalopods. What are cephalopods? Well, they are a class of mollusks that include two extant subclasses: Coleoidea and Nautiloidea. Still not sure what cephalopods are? You probably know them by their more common monikers: octopuses, squid, cuttlefish, and nautiluses. There are over 800 living species of cephalopods known today. Dr. Ian G. Gleadall has been studying the biology of cephalopods (particularly octopuses) for 40 years. Dr. Gleadall (a marine biologist who works in Sendai, Japan) discovered BHL in November, 2014 while visiting the National Museum of Natural History in Paris. It has had a profound impact on his research.