Jekel ran a natural history items and books store in Paris. In 1849 he wrote a revision of the work
Genera et species Curculionidarum by the Swedish entomologist
Carl Johan Schönherr. From 1854 to 1859 he self-published the three-volume work
Fabricia entomologica. In the following years he wrote a large number of specialist articles for various journals of entomological societies, including the first description of the
giraffe neck beetle from Madagascar in 1860. In total, Jekel described over 550 taxa, 367 of which are still valid today. These include genera and species from the beetle families
Anthribidae,
Attelabidae,
Curculionidae and
Geotrupidae. Genera described are
Lasiorhynchites,
Conothorax,
Chelotrupes,
Balanobius,
Donus,
Eudmetus,
Elytroxys and
Entomops. and in 1860 the second part appeared under the title
Insecta Saundersiana: Or, Characters of Undescribed Insects in the Collection of William Wilson Saunders, FRS, FLS Coleoptera - Curculionides ==Taxon names honouring him==