Johann Friedrich Wolff (1778- 1806) was a German physician botanist and entomologist. Year 1778 ( MDCCLXXVIII) was a Common year starting on Thursday (link will display the full calendar of the Gregorian calendar (or Year 1806 ( MDCCCVI) was a Common year starting on Wednesday (link will display the full calendar of the Gregorian calendar (or a Common Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. A physician, medical practitioner or medical doctor who practices Medicine, and is concerned with maintaining or restoring human Health Botany, plant science(s, phytology, or plant biology is a branch of Biology and is the scientific study of plant Life Entomology (from Greek grc ἔντομος entomos, "that which is cut in pieces or engraved/segmented" hence "insect" and grc -λογία He wrote Commentatio de Lemna. Altdorfii et Norimbergae (1801), Icones Cimicum descriptionibus illustratae. Erlangen 1800-1811 and some short papers. Wolff is the author of several genera and species of Hemiptera. A genus (plural genera from Γένος Latin genus "descent family type gender" is a low-level Taxonomic In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank. Hemiptera is an order of Insects comprising around 80000 Species of Cicadas Aphids Planthoppers Leafhoppers