Karl Fedorovich Kessler (19 November 1815 – 3 March 1881) was a German-Russian zoologist and author of zoological taxa

Taxon

|thumb|270px|[[African elephants]] form a widely-accepted taxon, the [[genus]] LoxodontaA taxon is a group of organisms, which a taxonomist adjudges to be a unit. Usually a taxon is given a name and a rank, although neither is a requirement...

 signed Kessler, who was mostly active in Kiev

Kiev

Kiev or Kyiv is the capital and the largest city of Ukraine, located in the north central part of the country on the Dnieper River. The population as of the 2001 census was 2,611,300. However, higher numbers have been cited in the press....

, Ukraine

Ukraine

Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

 and conducted most of his studies of birds in Ukrainian

Ukraine

Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

 regions of the Russian Empire

Russian Empire

The Russian Empire was a state that existed from 1721 until the Russian Revolution of 1917. It was the successor to the Tsardom of Russia and the predecessor of the Soviet Union...

 - Kiev Governorate

Kiev Governorate

Kiev Governorate , or Government of Kiev, was an administrative division of the Russian Empire.The governorate was established in 1708 along with seven other governorates and was transformed into a viceroyalty in 1781...

, Volyn Governorate, Kherson Governorate

Kherson Governorate

The Kherson Governorate or Government of Kherson was a guberniya, or administrative territorial unit, in the Southern Ukrainian region, between the Dnieper and Dniester Rivers, of the Russian Empire. It was one of three governorates created in 1802 when the Novorossiya guberniya was abolished...

, Poltava Governorate

Poltava Governorate

The Poltava Governorate or Government of Poltava was a guberniya in the historical Left-bank Ukraine region of the Russian Empire, which was officially created in 1802 from the disbanded Malorossiya Governorate which was split between the Chernigov Governorate and Poltava Governorate with an...

 and Bessarabia

Bessarabia

Bessarabia is a historical term for the geographic region in Eastern Europe bounded by the Dniester River on the east and the Prut River on the west....

. He also studied the fish of the Dniester

Dniester

The Dniester is a river in Eastern Europe. It runs through Ukraine and Moldova and separates most of Moldova's territory from the breakaway de facto state of Transnistria.-Names:...

, Dnieper, and Southern Bug

Southern Bug

The Southern Bug, also called Southern Buh), is a river located in Ukraine. The source of the river is in the west of Ukraine, in the Volyn-Podillia Upland, about 145 km from the Polish border, and flows southeasterly into the Bug Estuary through the southern steppes...

 rivers, and on the Ukrainian coast of the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

.

Reference