Emil Hans Willi Hennig (20 April 1913 – 5 November 1976) was a Germanbiologist and zoologist who is considered the founder of phylogenetic systematics, otherwise known as cladistics.[1][2][3] In 1945 as a 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.[4][5] As a taxonomist, he specialised in dipterans (true flies).
Hennig coined the key terms synapomorphy, 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."[6] This has been viewed as an application of the parsimony principle to the interpretation of characters, an important component of phylogenetic inference.[7]
He is also remembered for Hennig's progression rule in cladistics, which argues controversially[8] 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".[9] 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 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 Dipteran expert Fritz Isidor van Emden. Hennig saw him regularly until van Emden was expelled from National Socialist Germany for having a Jewish mother and wife.[10]
Hennig developed a deep friendship with Emden's successor, Klaus Günther. Hennig concluded his studies with a dissertation entitled, 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 of gliding lizards. After his studies, Hennig was Volontär at the 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 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 (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, 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.[11] Hennig did believe that Nazi Germany would win World War II.[12]
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
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,[13] 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, Chicago, Washington, D.C., and 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 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 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.
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.[15] A symposium volume[16] 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.
"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.
^Hennig, W. 1966. Phylogenetic Systematics. University of Illinois Press, Urbana.
^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 Iniversity Press, NY.
^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. ISBN0-231-12700-6
^Williams, David M.; Schmitt, Michael; Wheeler, Quentin D. (2016). The Future of Phylogenetic Systematics: the Legacy of Willi Hennig. Systematics Association Special Volume 86. Cambridge University Press.
Sources
Peters, G. (1995). "Über Willi Hennig als Forscherpersönlichkeit". Veröffentlichungen der Gesellschaft Naturforschende Freunde. 34. Berlin: 3–10.
Schlee, D. (1978). "In Memoriam Willi Hennig 1913-1976. Eine biographische Skizze". Entomologica Germanica. 4. Stuttgart: Fischer: 377–391. doi:10.1127/entom.germ/4/1978/377. ISSN0340-2266.
Schmitt, M. (2001). "Willi Hennig". In Jahn, I.; Schmitt M. (eds.). Darwin & Co. II - Die Geschichte der Biologie in Porträts. München: C.H. Beck. ISBN3-406-44642-6.
Schmitt, M. (2002). "Willi Hennig als akademischer Lehrer". In Schulz J. (ed.). Fokus Biologiegeschichte. Zum 80. Geburtstag der Biologiehistorikerin Ilse Jahn. Berlin: Akadras. pp. 53–64 pp. ISBN3-00-009209-9.
Schmitt, M. (2003). "Willi Hennig and the Rise of Cladistics". In Legakis, A.; Sfenthourakis, S.; Polymeni, R.; Thessalou-Legaki M. (eds.). The New Panorama of Animal Evolution - Proceedings of the 18th International Congress of Zoology. Sofia - Moskau: Pensoft Publ. pp. 369–379 pp. ISBN954-642-164-2.
Vogel, J.; Xylander, W.R. (1999). "Willi Hennig - Ein Oberlausitzer Naturforscher mit Weltgeltung. Recherchen zu seiner Familiengeschichte sowie Kinder- und Jugendzeit". Berichte der Naturforschenden Gesellschaft Oberlausitz. 7/8: 131–141. ISSN0941-0627.
Lasse Björn Världsmästare 1957Nationalitet SverigeFödd16 december 1931 (91 år), Stockholm, SverigeSpelardataPositionBackSkjuterVänsterKlubbarSpelade förDjurgårdens IFÖvrigtProffsår1949–1966Hall of Fame1998 Medaljer Ishockey, herrar Olympiska spel Brons Oslo 1952 Ishockey Världsmästerskap Brons Oslo 1958 Ishockey Guld Moskva 1957 Ishockey Brons Stockholm 1954 Ishockey Guld Zürich/Basel, Schweiz 1953 Ishockey Svenska mästersk…
ОпераМатео Фальконе Композитор Цезарь Кюи Либреттист Цезарь Кюи Источник сюжета одноимённый рассказ Проспера Мериме Действий I Первая постановка 1907 Место первой постановки Большой театр Матео Фальконе ― опера в одном действии, написанная русским композитором Цезарем К…
Lubang ozon di atas belahan bumi selatan antara tahun 1957–2001 Tanggal 16 September ditetapkan oleh Majelis Umum Persatuan Bangsa-Bangsa sebagai Hari Perlindungan Lapisan Ozon Sedunia. Ketetapan ini dibuat pada tanggal 19 Desember 1994 untuk memperingati tanggal ketika berbagai negara menandatangani Protokol Montreal tentang zat yang merusak lapisan ozon. Tema peringatan pada tahun 2013 adalah mengenai Kesehatan Atmosfer dan Masa Depan yang Kita Inginkan[1] Lihat pula Hari Aksi Ozon D…
Спаркен — скейт-парк біля корпусу Хамнмагазінет і річки Умеельвен в центрі міста Умео. Парк розташований прямо під Тегсброном, що приймає E4 і E12 через річку. Парк становить близько 20 метрів завширшки і 120 метрів в довжину[1]. Назва парку походить від імені конкурсу[2&…
Die Liste der Kulturdenkmale in der Inneren Neustadt enthält die Kulturdenkmale des Stadtteils Innere Neustadt in der Dresdner Gemarkung Neustadt. Diese Gemarkung in Dresden gliedert sich in die Stadtteile Innere Neustadt, Äußere Neustadt, Leipziger Vorstadt, Radeberger Vorstadt und Albertstadt. Die Anmerkungen sind zu beachten. Diese Liste ist eine Teilliste der Liste der Kulturdenkmale in Dresden. Diese Liste ist eine Teilliste der Liste der Kulturdenkmale in Sachsen. Inhaltsverzeichnis 1 L…
Washington's aides-de-camp during the American Revolutionary War were officers of the Continental Army appointed to serve on General George Washington's headquarters staff, with the rank of lieutenant colonel. The headquarters staff also included one military secretary, a full colonel. Washington had a small number of aides-de-camp at any given time, with relatively frequent turnover. A total of 32 men were appointed to these positions, and served between July 4, 1775, and December 23, 1783.[…
English association football player Ronnie Henry Henry playing for Stevenage Borough in the 2009 FA Trophy FinalPersonal informationFull name Ronnie Stephen Henry[1]Date of birth (1984-01-02) 2 January 1984 (age 39)[1]Place of birth Hemel Hempstead, England[2]Height 5 ft 11 in (1.80 m)[3]Position(s) DefenderTeam informationCurrent team Royston TownYouth career0000–2002 Tottenham HotspurSenior career*Years Team Apps (Gls)2002–2003 Tottenham …
العمامشة تقسيم إداري البلد المغرب الجهة الدار البيضاء سطات الإقليم سطات الدائرة سطات الجماعة القروية سيدي العايدي المشيخة أولاد ايدر السكان التعداد السكاني 479 نسمة (إحصاء 2004) • عدد الأسر 83 معلومات أخرى التوقيت ت ع م±00:00 (توقيت قياسي)[1]، وت ع م+01:00 (توقيت صيفي)[1…
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Lista Przebojów Programu Trzeciego – news · newspapers · books · scholar · JSTOR (March 2019) (Learn how and when to remove this template message) While most LP3 editions are broadcast from the Radio 3 studio in Warsaw, some are broadcast from mobile studios set …
Glenn MurcuttGlenn Murcutt pada 2004Lahir25 Juli 1936 (umur 87)London, InggrisKebangsaanAustraliaPekerjaanArsitekPenghargaanRAIA Gold Medal (1992)Penghargaan Pritzker (2002)American Institute of Architects Gold Medal (2009)GedungMarie Short House (1975), Fredericks House (1982), Ball-Eastaway House (1983), Magney House (1984), Marika-Alderton House (1994), Arthur and Yvonne Boyd Education Centre (1999) Glenn Marcus Murcutt AO (lahir 25 Juli 1936) adalah seorang arsitek Australia kelahiran I…
Element of hierarchy in armed forces This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Military rank – news · newspapers · books · scholar · JSTOR (January 2016…
Helen ThomasHelen Thomas pada Februari 2009LahirHelen Amelia Thomas(1920-08-04)4 Agustus 1920Winchester, Kentucky, Amerika SerikatMeninggal20 Juli 2013(2013-07-20) (umur 92)Washington, D.C., Amerika SerikatWarga negaraAmerikaAlmamaterUniversitas Wayne (B.A., 1942)PekerjaanPenulis, jurnalis, kolumnisTahun aktif1943–2013Dikenal atasWartawan wanita rintisan;anggota perempuan pertamapers Gedung PutihKota asalDetroit, Michigan, Amerika SerikatSuami/istriDouglas B. Cornell(1971–1982…
Defunct American bus manufacturer This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Carpenter Body Company – news · newspapers · books · scholar · JSTOR (August 2009) (Learn how and when to remove this template message) Carpenter Industries, Inc.Trade name1918-1937: Ralph H. Carpenter Body Company1937-1990: Carpe…
Shopping mall in Doha, QatarDoha Festival Cityدوحة فستيفال سيتيThe location of the Doha Festival City.LocationUmm Salal, Doha, QatarCoordinates25°23′06″N 51°26′32″E / 25.3850°N 51.4422°E / 25.3850; 51.4422Opening date5 April 2017; 6 years ago (2017-04-05)[1]OwnerAl Futtaim CompanyNo. of stores and services500+No. of floors2Public transit accessDoha Festival City bus stop.WebsiteDoha Festival City website [Interactive fu…
В Википедии есть статьи о других людях с такой фамилией, см. Баркас. Сэм Баркас Общая информация Полное имя Самьюэл Баркас Родился 29 декабря 1909(1909-12-29)Саут-Шилдс, Дарем, Англия Умер 10 декабря 1989(1989-12-10) (79 лет)Брадфорд, Йоркшир, Англия Гражданство Англия Рост 175 см Позиция левый …
Deretan paus yang mati oleh perburuan paus kepulauan Faroe. Perburuan paus (Inggris: Whaling) adalah sebuah kegiatan memburu ikan paus untuk memperoleh produk yang dapat dimanfaatkan manusia seperti daging, minyak, dan lemak paus. Kegiatan ini diperkirakan telah dilakukan sejak tahun 3000 SM. Beberapa masyarakat pesisir memiliki sejarah yang panjang tentang kegiatan ini sebagai mata pencaharian dan memanen daging paus yang diburu. Industri penangkapan paus muncul dengan armada yang terorganisir …
Gedung Grahadi pada tahun 1860-an Gedung Grahadi pada tahun 1930-an Gedung Grahadi saat ini digunakan sebagai rumah dinas Gubernur Jawa Timur Gedung Negara Grahadi adalah sebuah gedung di Surabaya, Jawa Timur yang dibangun tahun 1795 pada masa berkuasanya Residan Dirk Van Hogendorps (1794-1798). Pada mulanya gedung ini menghadap ke Kalimas di sebelah utara, sehingga pada sore hari penghuninya sambil minum-minum teh dapat melihat perahu-perahu yang menelusuri kali tersebut. Perahu-perahu itu juga…
List of events ← 1961 1960 1959 1962 in Iceland → 1963 1964 1965 Decades: 1940s 1950s 1960s 1970s 1980s See also: Other events of 1962 Timeline of Icelandic history The following lists events that happened in 1962 in Iceland. Incumbents President – Ásgeir Ásgeirsson Prime Minister – Ólafur Thors Events This section needs expansion. You can help by adding to it. (July 2016) Births Siv Friðleifsdóttir 22 April – Sigurður Ingi Jóhannsson, politician, Prime Minis…