August David Krohn (1803–1891) was a

Saint Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...

born zoologist of German origin. He was the son of Abraham Krohn, the founder of

Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

's first brewery, who had left the island of

Rügen Rügen (; Rani: ''Rȯjana'', ''Rāna''; , ) is Germany's largest island. It is located off the Pomeranian coast in the Baltic Sea and belongs to the state of Mecklenburg-Western Pomerania. The "gateway" to Rügen island is the Hanseatic ci ...

to serve in the court of

Catherine the Great Catherine II. (born Princess Sophie of Anhalt-Zerbst; 2 May 172917 November 1796), most commonly known as Catherine the Great, was the reigning empress of Russia from 1762 to 1796. She came to power after overthrowing her husband, Peter I ...

. He was the uncle of the

fennoman The Fennoman movement or Fennomania was a Finnish nationalist movement in the 19th-century Grand Duchy of Finland, built on the work of the ''fennophile'' interests of the 18th and early-19th centuries. History After the Crimean War, Fennoman ...

folklorist Folklore studies (also known as folkloristics, tradition studies or folk life studies in the UK) is the academic discipline devoted to the study of folklore. This term, along with its synonyms, gained currency in the 1950s to distinguish the ac ...

Julius Krohn Julius Leopold Fredrik Krohn (19 April 1835 – 28 August 1888) was a Finnish folk poetry researcher, professor of Finnish literature, poet, hymn writer, translator and journalist. He was born in Viipuri and was of Baltic German origin. Krohn ...

. According to legend, Krohn is said to have left for Central Europe after losing to his younger brother Leopold the competition for the hand of a

Vyborg Vyborg (; , ; , ; , ) is a town and the administrative center of Vyborgsky District in Leningrad Oblast, Russia. It lies on the Karelian Isthmus near the head of Vyborg Bay, northwest of St. Petersburg, east of the Finnish capital H ...

mansion owner's 15-year-old daughter. He remained unmarried until his death at the age of 88. Krohn worked at the

University of Bonn The University of Bonn, officially the Rhenish Friedrich Wilhelm University of Bonn (), is a public research university in Bonn, North Rhine-Westphalia, Germany. It was founded in its present form as the () on 18 October 1818 by Frederick Willi ...

zoology Zoology ( , ) is the scientific study of animals. Its studies include the anatomy, structure, embryology, Biological classification, classification, Ethology, habits, and distribution of all animals, both living and extinction, extinct, and ...

anatomy Anatomy () is the branch of morphology concerned with the study of the internal structure of organisms and their parts. Anatomy is a branch of natural science that deals with the structural organization of living things. It is an old scien ...

and

embryology Embryology (from Ancient Greek, Greek ἔμβρυον, ''embryon'', "the unborn, embryo"; and -λογία, ''-logy, -logia'') is the branch of animal biology that studies the Prenatal development (biology), prenatal development of gametes (sex ...

. He was a pioneer in

marine biology Marine biology is the scientific study of the biology of marine life, organisms that inhabit the sea. Given that in biology many scientific classification, phyla, family (biology), families and genera have some species that live in the sea and ...

and published essential works on ''

Chaetognatha The Chaetognatha or chaetognaths (meaning ''bristle-jaws'') are a phylum of predatory marine worms that are a major component of plankton worldwide. Commonly known as arrow worms, they are mostly pelagic; however about 20% of the known species ...

'' (Arrow Worms) in 1844 & 1853. He was in correspondence with

Charles Darwin Charles Robert Darwin ( ; 12 February 1809 – 19 April 1882) was an English Natural history#Before 1900, naturalist, geologist, and biologist, widely known for his contributions to evolutionary biology. His proposition that all speci ...

and is said to have pointed out errors in Darwin's work in his thesis. The

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

and species identified by him are marked with the author abbreviation ''Krohn''. He was the first to

classify Classification is the activity of assigning objects to some pre-existing classes or categories. This is distinct from the task of establishing the classes themselves (for example through cluster analysis). Examples include diagnostic tests, identif ...

the

phylum In biology, a phylum (; : phyla) is a level of classification, or taxonomic rank, that is below Kingdom (biology), kingdom and above Class (biology), class. Traditionally, in botany the term division (taxonomy), division has been used instead ...

Rhombozoa Dicyemida, also known as Rhombozoa, is a phylum of tiny parasites that live in the renal appendages of cephalopods. Taxonomy Classification is controversial. Traditionally, dicyemids have been grouped with the Orthonectida in the phylum Mes ...

'' of the kingdom ''

Animalia Animals are multicellular, eukaryotic organisms in the Biology, biological Kingdom (biology), kingdom Animalia (). With few exceptions, animals heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, ...

''. The species ''

Euphausia krohnii ''Euphausia'' is the largest genus of krill, and is placed in the family Euphausiidae. There are 31 species known in this genus, including Antarctic krill (''Euphausia superba'') and ice krill ('' Euphausia crystallorophias'') from the Southern ...

'' and '' Cliopsis krohnii'' and the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Eukrohniidae Eukrohniidae is a family of sagittoideans in the order Phragmophora. It consists of a single genus, ''Eukrohnia'' von Ritter-Záhony, 1909.von Ritter-Za'hony, R. (1909). Die Chaetognathen der Gazelle-Expedition. ''Zoologischer Anzeiger'', 34, 7 ...

'' are named after him.

Publications

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References

The Darwin Correspondence Online Database

''(in Finnish)''

{{DEFAULTSORT:Krohn, August David 19th-century zoologists from the Russian Empire Biologists from the Russian Empire University of Bonn alumni Scientists from Saint Petersburg 1891 deaths 1803 births People from the Russian Empire of German descent

Publications

Books

Journals

See also

References