A Belgian-French zoologist, often called the founder of cryptozoology. His name runs through several of the archive's strangest animal cases. Mid-December 1968, he arrived at a farm with Sanderson to see the Minnesota Iceman. For three days they studied the body through ice and glass, taking photographs and making sketches. Earlier accounts drew his attention too. He took the Valhalla sea serpent seen off Brazil in 1905 for a marine mammal, pointing to its dorsal fin and head. When a museum curator rejected van Herwaarden's 1923 sedapa account from Sumatra, Heuvelmans disputed the dismissal.
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Pro earlyCryptozoologist who proposed a walrus
Pro earlyCryptozoologist whose 'merhorse' type fits maned reports
Pro earlyCryptozoologist who included the Minhocão in On the Track of Unknown Animals
Pro earlyCryptozoologist who wrote on the Queensland tiger
Pro earlyCryptozoologist who called the tale a possible hoax
Pro earlyCryptozoologist who based his 'yellow-belly' type mainly on the Nestor
Cryptozoologist who placed the case among his many-finned sea serpents
Pro earlyCryptozoologist who listed the case in In the Wake of the Sea-Serpents
Pro earlyCryptozoologist who reviewed the correspondence and accused Lovell of lying
Pro earlyCryptozoologist who quoted Cringle's ridicule remark in In the Wake of the Sea-Serpents
Pro earlyCryptozoologist said to have classed the case as a many-finned sea serpent
Pro earlyCatalogued the case in In the Wake of the Sea-Serpents
Pro earlyCryptozoologist who quoted the Williams account in On the Track of Unknown Animals
Sea-serpent researcher who took the animal for a marine mammal
Pro earlyCryptozoologist who proposed a prehistoric crocodile, then an aquatic sabre-toothed cat
Pro earlyBelgian cryptozoologist who defended Fawcett's honesty in On the Track of Unknown Animals
Pro earlyCryptozoologist whose writing likely carried the account
Cryptozoologist who accepted the sighting as a marine saurian but rejected Forstner's explanation
Pro earlyCryptozoologist whose sea serpent classification includes the cow-headed 'merhorse' type
Pro earlyCryptozoologist whose book carried the account to English readers
Pro earlyCryptozoologist; suggested the agogwe could be a surviving gracile australopithecine
Pro earlyCryptozoologist; devoted the chapter 'Mngwa, the Strange One' to the case and proposed a giant African golden cat
Cryptozoologist whose translation carried the account into English
Pro earlyCryptozoologist who received Bartels's manuscript
Pro earlyCryptozoologist who proposed the name Leo maculatus
Pro earlyCryptozoologist linked to the olitiau in On the Track of Unknown Animals
Pro earlyReceived Sanderson's 1958 letter; covered the case in Les derniers dragons d'Afrique (1978)
Pro earlyCryptozoologist who identified the photo as a photomontage in 1955
Pro earlyCryptozoologist whose footnote misdated the case to 1935 and read the ship as a bay
Pro earlyCryptozoologist who covered the case in Le Grand serpent de mer
Pro earlyCryptozoologist who adopted Cox's later squid version
Co-author with Porshnev of L'Homme de Néanderthal est toujours vivant (1974)
Cryptozoologist whose super-eel category the case is linked to
Pro earlyCryptozoologist; analysed the case in Les Derniers Dragons d'Afrique (1978)
Pro earlyCryptozoologist who reproduced the witness sketches in In the Wake of the Sea-Serpents
Cryptozoologist who gave the fullest account in 1968 and favoured sand-weighted plastic sheeting
Belgian-French zoologist who examined it and described it as Homo pongoides
Pro earlyCryptozoologist who considered it a whale
