Dr. Koehler was a French zoologist best known for his work on echinoderms.

Relevant to the biota of the Gulf of Mexico, Dr. Koehler has published the following:

Koehler, R. 1906. Description des Ophiures nouvelle recueillies par le Travaillieur et Talisman pendant les compagnes 1880, 1881, 1882 et 1883. Memoires de la Societe Zoologique de France 19: 5–34.

Koehler, R. 1907. Revision de la collection des Ophiures du Muséum d’Histoire Naturelle de Paris. Bulletin Scientifique de la France et de la Belgique 41: 279–351.

Koehler, R. 1913. Ophiures. Zoologischer Jahrbucher Supplement 11: 351–380.

Koehler, R. 1914. A contribution to the study of ophiurans of the United States National Museum. Bulletin of the Smithsonian Institution United States National Museum 84: 1–173.