Editing Willi Hennig

{{Short description|German biologist and zoologist (1913–1976)}}
{{Use dmy dates|date=June 2022}}
{{Infobox scientist
|birth_name         = Emil Hans Willi Hennig
| image             = Willi Hennig2.jpg
| alt               = 
| caption           = Willi Hennig in 1972
| birth_date        = {{birth date|1913|04|20|df=y}}
| birth_place       = [[Dürrhennersdorf]], [[German Empire]]
| death_date        = {{death date and age|1976|11|05|1913|04|20|df=y}}
| death_place       = [[Ludwigsburg]], [[West Germany]]
| nationality       = 
| fields            = [[Taxonomy (biology)|Taxonomy]], [[Entomology]]
| education         = [[State Museum of Zoology, Dresden]], [[University of Leipzig]]
| workplaces        = [[Kaiser-Wilhelm-Gesellschaft]], Berlin-Dahlem; State Museum of Natural History, Stuttgart
| alma_mater        = 
| known_for         = [[Cladistics]], Hennig's progression rule
| awards            = [[Linnean Medal]] {{small|(1974)}}, honorary doctorate from the [[Freie Universität Berlin]] 
| spouse            = Irma Wehnert
}}

'''Emil Hans Willi Hennig''' (20 April 1913 – 5 November 1976) was a [[Germans|German]] [[biologist]] and [[zoologist]] who is considered the founder of [[Phylogenesis|phylogenetic]] systematics, otherwise known as [[cladistics]].<ref name="Dupuis">{{cite journal |last1=Dupuis |first1=C |title=Willi Hennig's Impact on Taxonomic Thought |journal=Annual Review of Ecology and Systematics |date=November 1984 |volume=15 |issue=1 |pages=1–25 |doi=10.1146/annurev.es.15.110184.000245 |language=en |issn=0066-4162|doi-access=free }}</ref><ref>{{Cite journal|author=Brower, Andrew V. Z.|year=2013|title=Willi Hennig at 100|journal=Cladistics|volume=30|issue=2|pages=224–225|doi=10.1111/cla.12057|doi-access=free}}</ref><ref>{{cite journal |last1=Wheeler |first1=Q |title=Heed the father of cladistics |journal=[[Nature (journal)|Nature]] |publisher=[[Nature Research]] |date=17 April 2013 |volume=496 |issue=7445 |pages=295–296 |doi=10.1038/496295a |doi-access=free |issn=1476-4687 |pmid=23598324}}</ref> In 1945 as a [[POWs in World War II|prisoner of war]], Hennig began work on his theory of cladistics, which he published in German in 1950, with a substantially revised English translation published in 1966. With his works on [[evolution]] and [[systematics]] he revolutionised the view of the natural order of beings.<ref>Palmer, Douglas. Evolution: the story of life. University of California Press: Berkeley. 2009. p. 13</ref><ref name="Engel">{{cite journal |last1=Engel |first1=Michael S. |last2=Kristensen |first2=Niels P. |title=A History of Entomological Classification |journal=Annual Review of Entomology |date=7 January 2013 |volume=58 |issue=1 |pages=585–607 |doi=10.1146/annurev-ento-120811-153536 |pmid=23317047 |url=https://doi.org/10.1146/annurev-ento-120811-153536 |language=en |issn=0066-4170}}</ref> As a [[Taxonomy (biology)|taxonomist]], he specialised in [[dipteran]]s (true flies).

Hennig coined the key terms [[synapomorphy]], [[Plesiomorphy and symplesiomorphy|symplesiomorphy]], and [[paraphyly]]. He also asserted, in his "auxiliary principle", that "the presence of apomorphous characters in different species 'is always reason for suspecting kinship [i.e., that species belong to a monophyletic group], and that their origin by convergence should not be presumed a priori' (Hennig, 1953). This was based on the conviction that 'phylogenetic systematics would lose all ground on which it stands' if the presence of apomorphous characters in different species were considered first of all as convergences (or parallelisms), with proof to the contrary required in each case."<ref>Hennig, W. 1966. ''Phylogenetic Systematics''. University of Illinois Press, Urbana.</ref>  This has been viewed as an application of the [[Principle of Parsimony|parsimony principle]] to the interpretation of characters, an important component of [[phylogenetic inference]].<ref>Farris, J. S. 1983. The logical basis of phylogenetic analysis. Pp.7-36 in Advances in Cladistics, vol. 1 (eds. N. I. Platnick and V. A. Funk). Columbia University Press, NY.</ref>

He is also remembered for '''Hennig's progression rule''' in cladistics, which argues controversially<ref name="Briggs1987">{{cite book |last=Briggs |first=J.C. |title=Biogeography and Plate Tectonics |url=https://books.google.com/books?id=vCNG2e5K-YgC&pg=PA11 |year=1987 |publisher=Elsevier |isbn=978-0-08-086851-6 |page=11}}</ref> that the most primitive species are found in the earliest, central part of a group's area.

==Biography==

===Early years and studies===
Hennig was born in [[Dürrhennersdorf]], [[Upper Lusatia]]. His mother Marie Emma, née Groß, worked as a maid and, later, factory worker. His father Karl Ernst Emil Hennig was a rail worker. Willi had two brothers, [[Fritz Rudolf Hennig]], who became a minister, and Karl Herbert, who went missing at the [[Battle of Stalingrad]] in 1943.

In the spring of 1919, Willi Hennig started school in Dürrhennersdorf, and subsequently was at school in Taubenheim an der Spree and Oppach. Rudolf Hennig described the family as calm; his father possessed an even temperament.

As of 1927, Willi Hennig continued his education at the Realgymnasium and boarding school in Klotzsche near [[Dresden]]. Here he met his first mentor M. Rost, a science teacher, whom he lived with in a house known as the "''Abteilung"''.<ref name=meier>Rudolf Meier. Role of Dipterology in Phylogenetic Systematics: The Insight of Willi Hennig  in David K. Yeates and Brian M.Wiegmann (Eds) 2005. The evolutionary biology of flies. Columbia University Press. {{ISBN|0-231-12700-6}}</ref> Rost had an interest in insects and introduced Hennig to [[Wilhelm Meise]], who worked as a scientist at the Dresdener Museum für Tierkunde ([[State Museum of Zoology, Dresden]]). In 1930, Hennig skipped a year, and graduated on 26 February 1932. As early as 1931, Willi Hennig composed an essay entitled ''Die Stellung der Systematik in der Zoologie'' ("The state of systematics in zoology") as part of his school work, published posthumously in 1978. It showed his interest as well as his deliberate treatment of systematic problems. Besides school, Hennig worked as a volunteer at the museum and, in collaboration with Meise, saw to the systematic and biogeographical investigation of the "flying" snakes of the genus ''[[Dendrelaphis|Dendrophis]]'' that became his first published work.

From the summer semester of 1932 onwards, Hennig read zoology, botany and geology at the University of Leipzig. He would continue to visit the Museum in Dresden. There, he met the curator of the entomological collection, the [[Fly|Dipteran]] expert [[Fritz_Isidore_van_Emden_(entomologist)|Fritz Isidor van Emden]]. Hennig saw him regularly until van Emden was expelled from National Socialist Germany for having a Jewish mother and wife.<ref>{{Cite book|url=https://books.google.com/books?id=9aW34_pTwrQC|title=From Taxonomy to Phylogenetics – Life and Work of Willi Hennig|last=Schmitt|first=Michael|date=11 April 2013|publisher=BRILL|isbn=978-9004219298|language=en}}</ref>

Hennig developed a deep friendship with Emden's successor, Klaus Günther. Hennig concluded his studies with a dissertation entitled, ''{{lang|de|Beiträge zur Kenntnis des Kopulationsapparates der cyclorrhaphen Dipteren}}''. By this time, Hennig had published eight scientific papers. Besides his 300-page revision of the ''Tylidae'' (now classed as [[Micropezidae]]), there were further papers on Diptera and the [[agamid]] genus ''[[Draco (genus)|Draco]]'' of gliding lizards. After his studies, Hennig was Volontär at the [[Staatliches Museum für Tierkunde Dresden|State Museum for Zoology in Dresden]]. On 1 January 1937, he obtained a scholarship from the [[Deutsche Forschungsgemeinschaft]] (DFG) to work at the German Entomological Institute of the [[Kaiser-Wilhelm-Gesellschaft]] in [[Dahlem (Berlin)|Berlin-Dahlem]]. On 13 May 1939, Hennig married his former fellow student Irma Wehnert. By 1945, they had three sons, Wolfgang (born 1941), Bernd (born 1943) and Gerd (born 1945).

===As a military entomologist===
Willi Hennig was drafted in 1938 to train for the infantry and concluded this course in 1939. As of the start of [[World War II]], he was deployed in the  infantry in Poland, France, Denmark and Russia. He was injured by grenade shrapnel in 1942 and was subsequently used as entomologist at the Institute for Tropical Medicine and Hygiene in Berlin, carrying the rank of a [[Sonderführer|Sonderführer (Z)]]. Just before the war ended, he was sent to Italy to the 10th Army, Heeresgruppe C, to fight [[malaria]] and other epidemic diseases. At the end of the war in May 1945, he was captured by the British while he was with the [[Malaria]] training corps at the [[Gulf of Trieste]], and was only released in the autumn.

Through his active participation in war as soldier and scientist Hennig was later subjected to accusations that he had been a member of the National Socialist party, especially by the Italian biologist and founder of [[panbiogeography]], [[Léon Camille Marius Croizat|Leon Croizat]]. No evidence has been officially presented to support the claim. There is no report of Hennig supporting the National Socialist party views publicly on any occasion.<ref>{{Cite book|url=https://books.google.com/books?id=oQpKAQAAQBAJ|title=The Evolution of Phylogenetic Systematics|last=Hamilton|first=Andrew|date=9 November 2013|publisher=Univ of California Press|isbn=9780520956759|language=en}}</ref>  Hennig did believe that [[Nazi Germany]] would win [[World War II]].<ref>{{Cite book|url=https://books.google.com/books?id=rSEtBAAAQBAJ|title=The Walking Whales: From Land to Water in Eight Million Years|last=Thewissen|first=J. G. M. "Hans"|date=13 November 2014|publisher=Univ of California Press|isbn=9780520959415|language=en}}</ref>

During his time as prisoner of war, Hennig began to draft his most important contribution to systematics, not published until 1950. The rough draft was composed with pencil and ballpoint pen into an A4 exercise book, spanning 170 pages. During the war, he also published a further 25 scientific papers. Most of the correspondence and literature research was conducted by his wife, Irma.

===1950s: ''Basic outline of a theory of phylogenetic systematics''===
From 1 December 1945, to 31 March 1947, Willi Hennig stood in for his thesis supervisor Paul Buchner as assistant to Professor Friedrich Hempelmann at the University of Leipzig, giving lectures in general biology, zoology and special zoology of insects. He returned to the German Entomological Institute in Berlin on 1 April 1947, and gave up his position in Leipzig. From 1 November 1949, he led the section for systematic entomology and was second director of the institute. On 1 August 1950, he habilitated in zoology at the Brandenburgische Landeshochschule in [[Potsdam]]. On 10 October that year he was offered a professorship with teaching responsibilities, which he fulfilled lecturing on special zoology of invertebrates, systematic zoology and taxonomic practicals. In the same year, he published his ''Basic outline of a theory of phylogenetic systematics'', and further works on the methodology of phylogenetic systematics followed in the ensuing years, accompanied by numerous taxonomic works about Diptera. His two-volume ''Pocket book of zoology'', in which he applied phylogenetic systematics to invertebrates for the first time, was particularly successful.

He continued working at the German Entomological Institute in the Soviet Sector of Berlin, [[Berlin-Friedrichshagen]], all the while living in the American sector in [[Berlin-Steglitz]]. On a trip to France with his son on 13 August 1961, he heard of the impending Berlin Wall and returned to Berlin immediately to quit his appointment. Moving to East Berlin was out of the question, as Hennig held anti-communist views and already had a troubled relationship with the [[Sozialistische Einheitspartei Deutschlands]] (Socialist Unity Party of Germany, SED) that was the ruling political party of East Germany, as Hennig had repeatedly helped employees of the institute gain employment in the West.

===1961 to 1976===
[[File:Willi Hennig.jpg|thumb|upright|Hennig, c. 1970]]

In West Berlin, Hennig was given an interim post at the Technische Universität Berlin as Distinguished Professor. He rejected offers from the [[U.S. Department of Agriculture]] in [[Washington, D.C.]], and an offer made by his friend Elmo Hardy, to become a Research Fellow at the [[University of Hawaii]] in [[Honolulu]], citing as reasons that the education of his sons took priority for him, and that he needed to have the "cultural witnesses of the antique Greek-Roman Europe within ready access". He instead decided on a post at the State Museum of Natural History in Stuttgart,<ref>{{Cite web|url=https://www.naturkundemuseum-bw.de/|title=Naturkundemuseum Stuttgart|website=Naturkundemuseum Stuttgart}}</ref> where he was given a department for phylogenetic research. In April 1963, he moved to [[Ludwigsburg]]-Pflugfelden for this position. The scientific collections of the museum had been provisorily kept in Ludwigsburg and remained here until their re-housing at the new site of the museum at Stuttgart's Löwentor, in 1985.

Hennig's works in Stuttgart dealt almost exclusively with taxonomic revisions of Dipterans. For the ''Stuttgarter Beiträge zur Naturkunde'', where he published the majority of his works, he completed 29 issues by the end of his life. Significant are the review articles published in [[Erwin Lindner]]'s ''Flies of the Palaearctic Regions'' and the ''Handbuch der Zoologie''. The cladistic methodology was also represented in several published works, foremost among them the article, ''Cladistic analysis or cladistic classification? A reply to Ernst Mayr'' (1974), intended as an internationally accessible reply to the criticism [[Ernst Mayr]] had made of Hennig's phylogenetic systematics.

Willi Hennig only visited international institutions abroad twice, in spite of receiving many invitations for guest lectures. From 1 September to 30 November 1967, he worked at the Entomology Research Institute at Canada's Department of Agriculture in [[Ottawa]] and participated in the International Congress of Entomology in [[Canberra]] from 22 to 30 August 1972. With his wife, he also visited Bangkok, New Guinea (where much of Mayr's understanding of bird taxonomy originated) and Singapore on this latter trip. His stay in Canada was also used for visits to various entomological collections in museums of the US, including [[Cambridge (Massachusetts)|Cambridge]], [[Chicago]], [[Washington, D.C.]], and [[New York City|New York]], always in the hope of finding further amber inclusions of Dipterans, that featured prominently in his research of the late 1960s and early 1970s. On the initiative of Klaus Günther, who by then held a chair at the [[Freie Universität Berlin]], Hennig was given an honorary doctorate on 4 December 1968; for health reasons, he could not accept this honour in person, and it was presented to him by Günther on 21 March 1969, in Stuttgart. On the initiative of students whom he had lectured on several animal taxa, Hennig was made an honorary professor at the [[University of Tübingen]] on 27 February 1970.

On the night of 5 November 1976, Hennig died of a [[myocardial infarction|heart attack]] at Ludwigsburg. He had previously repeatedly cancelled lectures with reference to his fading health, and had already had an attack on his journey to Ottawa. He was interred on 10 November at the Bergfriedhof in [[Tübingen]].

The dipteran genus ''Hennigiola'' is named after him, as is the [[Evaniidae|Evaniid]] wasp ''[[Hyptia hennigi]]''.<ref>Jennings John T., Lars Krogmann & PRIYA. [http://www.mapress.com/zootaxa/list/2013/3731(3).html Happy birthday Willi Hennig! — Hyptia hennigi sp. nov. (Hymenoptera: Evaniidae), a fossil ensign wasp from Eocene Baltic amber]. // [[Zootaxa]]. Auckland, New Zealand: Magnolia Press, 2013. — Vol. 3731. — № 3. — P. 395–398. — {{ISSN|1175-5326}}. {{doi|10.11646/zootaxa.3731.3.10}}</ref>

== Legacy ==
The [[Willi Hennig Society]], an organization devoted to the advancement of [[cladistic]] principles in [[systematic biology]], was founded in 1981.  The society publishes the journal ''[[Cladistics (journal)|Cladistics]]''.
A symposium, ''Willi Hennig (1913-1976): His Life, Legacy and the Future of Phylogenetic Systematics'', was held in London by the [[Linnean Society of London]] on 27 November 2013.<ref name="TLSoL">{{cite web|url=http://www.linnean.org/Meetings-and-Events/Events/Willi+Hennig+and+the+Future+of+Phylogenetic+Systematics|title=Willi Hennig (1913-1976): His Life, Legacy and the Future of Phylogenetic Systematics|publisher=[[Linnean Society of London]]|access-date=8 November 2013|archive-url=https://web.archive.org/web/20130821141534/http://www.linnean.org/Meetings-and-Events/Events/Willi+Hennig+and+the+Future+of+Phylogenetic+Systematics|archive-date=21 August 2013 }}</ref>  A symposium volume<ref>{{cite book|author1=Williams, David M.|author2= Schmitt, Michael| author3= Wheeler, Quentin D.|year= 2016| title= The Future of Phylogenetic Systematics: the Legacy of Willi Hennig. Systematics Association Special Volume 86. |publisher=Cambridge University Press}}</ref> was published in 2016 by the Systematics Association.

==Selected works==

Books:

* ''Die Larvenformen der Dipteren,'' 3 vols., Berlin: Akademie-Verlag, 1948-1952.
* ''Grundzüge einer Theorie der phylogenetischen Systematik,'' Berlin: Deutscher Zentralverlag, 1950.
* ''Phylogenetic Systematics,'' translated by D. Davis and R. Zangerl, Urbana: University of Illinois Press, 1966 (reprinted 1979).
* ''Die Stammesgeschichte der Insekten,'' Frankfurt am Main: Verlag von Waldemar Kramer, 1969.
* ''Phylogenetische Systematik'', edited by Prof. Dr. Wolfgang Hennig, Berlin and Hamburg: Verlag Paul Parey, 1982.
* ''Aufgaben und Probleme stammesgeschichtlicher Forschung'', Berlin: Paul Parey, 1984.

Articles:

* "Die Schlangengattung Dendrophis," ''Zoologischer Anzeiger,'' vol. 99, 1932, 273-297 (gemeinsam mit W. Meise).
* "Beziehungen zwischen geographischer Verbreitung und systematischer Gliederung bei einigen Dipterenfamilien: ein Beitrag zum Problem der Gliederung systematischer Kategorien höherer Ordnung," ''Zoologischer Anzeiger,'' vol. 116, 1936, 161-175.
* "Revision der Gattung ''Draco'' (Agamidae)," ''Temminckia: a Journal of Systematic Zoology,'' vol. 1, 1936, 153-220.
* "Über einige Gesetzmäßigkeiten der geographischen Variation in der Reptiliengattung ''Draco'' L.: „parallele" und konvergente Rassenbildung," ''Biolog. Zentralblatt'', vol. 56, 1936, 549-559.
* "Die Gattung Rachicerus Walker und ihre Verwandten im Baltischen Bernstein," ''Zool. Anz''., vol. 123, 1938, 33-41.
* "Probleme der biologischen Systematik," ''Forschungen und Fortschritte'', vol. 21/23, 1947, 276-279.
* "Kritische Bemerkungen zum phylogenetischen System der Insekten," ''Beiträge zur Entomologie'', vol. 3 (Sonderheft), 1953, 1-85.
* "Flügelgeäder und System der Dipteren unter Berücksichtigung der aus dem Mesozoikum beschriebenen Fossilien," ''Beiträge zur Entomologie'', vol. 4, 1954, 245-388.
* "Systematik und Phylogenese," ''Bericht Hunderjahrfeier Dtsch. Ent. Ges.'', 1956, 50-71.
* "Die Familien der Diptera Schizophora und ihre phylogenetischen Verwandtschaftsbeziehungen," ''Beitr. Ent.'', vol. 8, 1958, 508-688.
* "Die Dipteren-Fauna von Neuseeland als systematisches und tiergeographisches Problem," ''Beitr. Ent.'', vol. 10, 1960, 221-329.
* "Phylogenetic Systematics," ''Annu. Rev. Entomol.'', vol. 10, 1965, 97-116.
* "Dixidae aus dem Baltischen Bernstein, mit Bemerkungen über einige andere fossile Arten aus der Gruppe Culicoidea," ''Beitr. Naturkde'', vol. 153, 1966, 1-16.
* "Die sogenannten „niederen Brachycera" im Baltischen Bernstein," ''Beitr. Naturkde'', vol. 174, 1967, 1-51.
* "Kritische Bemerkungen über den Bau der Flügelwurzel bei den Dipteren und die Frage nach der Monophylie der Nematocera," ''Beitr. Naturkde'', vol. 193, 1968, 1-23.
* "Cladistic Analysis or Cladistic Classification? A reply to Ernst Mayr," ''Syst. Zool.'', vol. 24, 1975, 244-256.

==References==
{{Reflist}}

==Sources==
* {{Cite journal|last=Peters|first=G.|year=1995|title=Über Willi Hennig als Forscherpersönlichkeit|journal=Veröffentlichungen der Gesellschaft Naturforschende Freunde|volume=34|pages=3–10|location=Berlin}}
* {{Cite journal|last=Schlee|first=D.|year=1978|title=In Memoriam Willi Hennig 1913-1976. Eine biographische Skizze|journal=Entomologica Germanica|issn=0340-2266|volume=4|pages=377–391|location=Stuttgart|publisher=Fischer|doi=10.1127/entom.germ/4/1978/377}}
* {{Cite book|last=Schmitt|first=M.|chapter=Willi Hennig|editor=Jahn, I. |editor2=Schmitt M.|title=Darwin & Co. II - Die Geschichte der Biologie in Porträts|publisher=C.H. Beck|location=München|year=2001|isbn=3-406-44642-6}}
* {{Cite book|last=Schmitt|first=M.|chapter=Willi Hennig als akademischer Lehrer|editor=Schulz J.|title=Fokus Biologiegeschichte. Zum 80. Geburtstag der Biologiehistorikerin Ilse Jahn|publisher=Akadras|location=Berlin|year=2002|isbn=3-00-009209-9|pages=53–64 pp}}
* {{Cite book|last=Schmitt|first=M.|chapter=Willi Hennig and the Rise of Cladistics|editor=Legakis, A. |editor2=Sfenthourakis, S. |editor3=Polymeni, R. |editor4=Thessalou-Legaki M.|title=The New Panorama of Animal Evolution - Proceedings of the 18th International Congress of Zoology|publisher=Pensoft Publ.|location=Sofia - Moskau|year=2003|isbn=954-642-164-2|pages=369–379 pp}}
* {{Cite journal|last=Vogel|first=J.|author2=Xylander, W.R.|year=1999|title=Willi Hennig - Ein Oberlausitzer Naturforscher mit Weltgeltung. Recherchen zu seiner Familiengeschichte sowie Kinder- und Jugendzeit|journal=Berichte der Naturforschenden Gesellschaft Oberlausitz|issn=0941-0627|volume=7/8|pages=131–141}}

==See also==
{{portal|Biography|Biology|Germany}}
*[[Phylogenetics]]

==External links==
* [https://web.archive.org/web/20031003160300/http://www.cladistics.org/about/hennig.html Biographical article on Willi Hennig]
* [https://web.archive.org/web/20160304121513/http://www.mnf.uni-greifswald.de/fileadmin/Allg_und_Sys_Zoologie/Dateien/Schmitt_W_Hennig.pdf Extensive biography of Willi Hennig] {{In lang|de}}
* [http://www.canacoll.org/Diptera/Main/Hennig_translations.htm Canadian National Collection]—Translations (PDF) of important papers

{{Biological rules}}
{{Authority control}}

{{DEFAULTSORT:Hennig, Willi}}
[[Category:1913 births]]
[[Category:1976 deaths]]
[[Category:20th-century German biologists]]
[[Category:20th-century German zoologists]]
[[Category:Dipterists]]
[[Category:German evolutionary biologists]]
[[Category:German entomologists]]
[[Category:German prisoners of war in World War II]]
[[Category:German taxonomists]]
[[Category:Members of the Royal Swedish Academy of Sciences]]
[[Category:People from Görlitz (district)]]
[[Category:Scientists from the Kingdom of Saxony]]
[[Category:Phylogenetics researchers]]