John Hemsworth Osborne-Day, English-born South African marine biologist (Sussex, England 25 August 1909 – Knysna 24 April 1989)
Authority internationally recognized on the ecology of estuaries and coastal waters as well as on the taxonomy of polychaete worms
DESCRIBED POLYCHAETA GENERA
Anguillopsyllis 1963
Capitobranchus 1962
Drilognathus 1960
Exogonoides 1963
Lamellisyllis 1960
Leitoscoloplos 1977
Micronereides 1963
Neovermilia 1961
Orbiniella 1954
Pharyngeovolvata 1951
Proscoloplos 1954
Scoloplella 1963
Terebellobranchia 1951
Telothelepus 1955
Unanereis 1962
HONORS
Dayellus Inglis 1964 (Nematoda)
Dayipsammolyce Pettibone 1997 (Annelida Polychaeta)
Dayius Steiner & Amaral 1999 (Annelida Polychaeta)