'''August David Krohn''' (1803–1891) was a [[Saint Petersburg]] born zoologist of German origin. He was the son of [[Abraham Krohn]], the founder of [[Russia]]'s first brewery, who had left the island of [[Rügen]] to serve in the court of [[Catherine II of Russia|Catherine the Great]]. He was the uncle of the [[fennoman]] [[folklorist]] [[Julius 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]] 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]] on [[zoology]], [[anatomy]] and [[embryology]]. He was a pioneer in [[marine biology]] and published essential works on ''[[Chaetognatha]]'' (Arrow Worms) in 1844 & 1853. He was [[Correspondence of Charles Darwin|in correspondence]] with [[Charles Darwin]] and is said to have pointed out errors in Darwin's work in his thesis. The [[genus]] and species identified by him are marked with the [[List of zoologists by author abbreviation|author abbreviation]] '''''Krohn'''''. He was the first to [[Scientific classification|classify]] the [[phylum]] ''[[Rhombozoa]]'' of the [[kingdom (biology)|kingdom]] ''[[Animalia]]''.
The species ''[[Euphausia krohnii]]'' and ''[[Cliopsis krohnii]]'' and the [[Family (taxonomy)|family]] ''[[Eukrohniidae]]'' are named after him.
== Publications ==
=== Books ===
* {{cite thesis | last = Krohn | first = Augustus Davides | year = 1826 | title = De iridodialysis operatione instrumentisque in ea adhibendis : Dissertatio ophthalmologica inauguralis ... | publisher = Typis Academiæ Regiæ Scientiarum | location = Berlin | language = Latin |oclc=16066369 | degree= Doctoral }}
* {{cite book | last = Krohn | first = August David | author-link = | year = 1844 | title = Anatomisch-physiologische Bebachtungen über die Sagitta bipuncta | publisher = [[Nestler & Melle]] | location = [[Hamburg]] | format = | id = | url = | quote = }}
* {{cite book | last = Krohn | first = August David | author-link = | year = 1849 | title = Beitrag zur Entwicklungsgeschichte der Seeigellarven | publisher = [[Julius Groos]] | location = [[Heidelberg]] | format = 35, [1] p.: 2 plates; 27 cm | id = | url = http://www.usc.edu/isd/archives/arc/findingaids/hancockcollection/rbbooksk/krohna1.htm | quote = [[Sea urchin]]s }}
* {{cite book | last = Krohn | first = A | author-link = | year = 1860 | title = Beiträge zur Entwicklungsgeschichte der Pteropoden und Heteropoden | publisher = Engelmann | location = [[Leipzig]] | format = 1-45, 2 pls. | id = | url = https://archive.org/details/beitrgezurentw00kroh | quote = }}
===Journals===
* {{cite journal | first = A | last = Krohn | author-link = | year = 1845 | title = Ueber einen neuen cephalopoden (Octopodoteuthis). | journal = [[Archiv für Naturgeschichte]] | volume = 11 | pages = 47–49 | id = | url = }}
* {{cite journal |first = A |last = Krohn |author-link = |year = 1847 |title = Nachtrage zu den Aufsatzen uber Tiedemannia, Octopodoteuthis und Alciopa., 13. . |journal = [[Archiv für Naturgeschichte]] |volume = 13 |pages = 36–40 |id = |url = http://www.itis.usda.gov/servlet/SingleRpt/RefRpt?search_type=publication&search_id=pub_id&search_id_value=1185 }}{{dead link|date=June 2025|bot=medic}}{{cbignore|bot=medic}}
* {{cite journal | first = August David | last = Krohn | author-link = |date=January 1847 | title = Observations sur deux nouveaux genres de Gastéropodes (''Lobiger'' et ''Lophocercus'') | journal = [[Annales des Sciences Naturelles]] | volume = Tome VII | issue = In 8° | pages = 52–60 | id = | url = https://archive.org/stream/annalesdesscienc07hist#page/52/mode/2up }}
* {{cite journal | first = A | last = Krohn | author-link = | year = 1860 | title = Über die Schale der Larven des Gasteropteron Meckelii | journal = [[Archiv für Naturgeschichte]] | volume = | pages = 64–68 | id = | url = }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1837 | title = Ueber das Auge der lebendiggebährenden Sumpfschnecke (Paludina vivipara) | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 479–485 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30386 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1837 | title = Ueber die Structur der Iris der Vögel und ihren Bewegungsmechanismus | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 357–380 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30386 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1839 | title = Ueber das Nervensystem des Sipunculus nudus | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 348–352 | id = | url = http://vlp.mpiwg-berlin.mpg.de/references?id=lit30389 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1839 | title = Fernerer Beitrag zur Kenntniss des Schneckenauges | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 332–337 | id = | url = http://vlp.mpiwg-berlin.mpg.de/references?id=lit30389 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1839 | title = Ueber das wasserführende System einiger Cephalopoden | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 353–359 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30389 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1840 | title = Ueber augenähnliche Organe bei Pecten und Spondylus | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 371–386 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30390 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1841 | title = Ueber die Anordnung des Nervensystems der Echiniden und Holothurien im Allgemeinen | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 1–13 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30391 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1842 | title = Ueber den Sternapsis thalassemoides | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 426–432 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30392 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1842 | title = Ueber den Vertumnus tethidicola | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 418–423 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30392 }} * {{cite journal | first = August | last = Krohn | author-link = | year = 1843 | title = Einige Bemerkungen und Beobachtungen über die Geschlechtsverhältnisse bei den Sertularinen | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 174–181 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30393 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1851 | title = Ueber die Larve des Sinpunculus nudus, nebst vorausgeschickten Bemerkungen über die Sexualverhältnisse der Sipunculiden | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 368–379 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30401 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1851 | title = Ueber die Entwickelung einer lebendig gebärenden Ophiure: Briefliche Mittheilung an den Herausgeber | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 338–343 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30401 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1851 | title = Beobachtungen aus der Entwickelungsgeschichte der Holothurien und Seeigel: Briefliche Mittheilung an den Herausgeber | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 344–352 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30401 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1852 | title = Ueber die Entwickelung der Ascidien | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 312–333 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30402 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1853 | title = Ueber einige niedere Thiere: Briefliche Mittheilung an den Herausgeber | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 137–141 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30403 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1853 | title = Ueber die Lehre von Spatangus purpureus | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 255–259 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30403 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1853 | title = Ueber die Brut des Cladonema radiatum und deren Entwickelung zum Stauridium | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 420–426 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30403 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1853 | title = Ueber die Entwickelung der Seesterne und Holothurien | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 317–321 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30403 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1853 | title = Ueber die Larve des Echinus brevispinosus | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 361–364 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30403 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1854 | title = Beobachtungen über Echinodermenlarven | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 208–213 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30404 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1855 | title = Ueber die frühesten Entwickelungsstufen der Pelagia noctiluca | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 491–497 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30405 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1855 | title = Ueber die Sprösslinge von Autoglytus prolifera Gr. | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 489–490 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30405 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1856 | title = Beobachtungen aus der Entwickelungsgeschichte der Pteropoden und Echinodermen: Briefliche Mittheilung an den Herausgeber | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 515–522 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30406 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1857 | title = Beobachtungen aus der Entwicklungsgeschichte der Pteropoden und Heteropoden: Briefliche Mittheilung an den Herausgeber | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 459–468 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30407 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1857 | title = Ueber einen neuen Entwicklungsmodus der Ophiuren | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 369–375 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30407 }}
* {{cite journal | first = August | last = Krohn | author-link = | year = 1858 | title = Über Pilidium und Actinotrocha | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 289–301 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30408 }}
* {{cite journal | first = August | last = Krohn | author-link = |author2=Anton Schneide |author2-link=Anton Schneide | year = 1867 | title = Ueber Annelidlarven mit porösen Hüllen | journal = [[Archiv für Anatomie, Physiologie und wissenschaftliche Medicin]] | volume = | issue = | pages = 498–508 | id = | url = http://vlp.mpiwg-berlin.mpg.de/library/data/lit30417 }}
== See also == * [[Johann Friedrich von Brandt]]
== References == * [https://web.archive.org/web/20060404093442/http://darwin.lib.cam.ac.uk/perl/nav?pclass=name The Darwin Correspondence Online Database] * [https://web.archive.org/web/20060117201912/http://koti.welho.com/tkrohn/krohn.html Krohn-suvun vaellustarina] ''(in Finnish)'' * [http://www.tmbl.gu.se/libdb/taxon/personetymol/petymol.k.html Biographical Etymology of Marine Organism Names] {{Webarchive|url=https://web.archive.org/web/20150128114215/http://www.tmbl.gu.se/libdb/taxon/personetymol/petymol.k.html |date=2015-01-28 }}
{{Authority control}}
{{DEFAULTSORT:Krohn, August David}} [[Category:19th-century zoologists from the Russian Empire]] [[Category:University of Bonn alumni]] [[Category:Scientists from Saint Petersburg]] [[Category:1891 deaths]] [[Category:1803 births]] [[Category:People from the Russian Empire of German descent]]