Édouard Joseph Louis Marie Van Beneden (5 March 1846 in Leuven – 28 April 1910 in Liège), son of Pierre-Joseph Van Beneden, was a Belgian

embryologist Embryology (from Greek ἔμβρυον, ''embryon'', "the unborn, embryo"; and -λογία, ''-logia'') is the branch of animal biology that studies the prenatal development of gametes (sex cells), fertilization, and development of embryos and ...

cytologist Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and ...

and

marine biologist Marine biology is the scientific study of the biology of marine life, organisms in the sea. Given that in biology many phyla, families and genera have some species that live in the sea and others that live on land, marine biology classifie ...

. He was professor of

zoology Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and ...

at the

University of Liège The University of Liège (french: Université de Liège), or ULiège, is a major public university of the French Community of Belgium based in Liège, Wallonia, Belgium. Its official language is French. As of 2020, ULiège is ranked in the 301� ...

. He contributed to cytogenetics by his works on the

roundworm The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broa ...

Ascaris ''Ascaris'' is a genus of parasitic nematode worms known as the "small intestinal roundworms", which is a type of parasitic worm. One species, '' Ascaris lumbricoides'', affects humans and causes the disease ascariasis. Another species, '' Asca ...

''. In this work he discovered how

chromosome A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins ar ...

s organized

meiosis Meiosis (; , since it is a reductional division) is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately r ...

(the production of

gametes A gamete (; , ultimately ) is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. Gametes are an organism's reproductive cells, also referred to as sex cells. In species that produce ...

). Van Beneden elucidated, together with

Walther Flemming Walther Flemming (21 April 1843 – 4 August 1905) was a German biologist and a founder of cytogenetics. He was born in Sachsenberg (now part of Schwerin) as the fifth child and only son of the psychiatrist Carl Friedrich Flemming (1799–1880 ...

and Eduard Strasburger, the essential facts of

mitosis In cell biology, mitosis () is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei. Cell division by mitosis gives rise to genetically identical cells in which the total number of chromosomes is maintai ...

, where, in contrast to meiosis, there is a qualitative and quantitative equality of chromosome distribution to daughter cells. (See

karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...

Publications

* ''Recherches sur la composition et la signification de l'œuf'' 186
Full text available from Archive.orgPDF
* ''La maturation de l'oeuf, la fecondation, et les premieres phases du développement embryonnaire des mammifères, d'aprés des recherches faites chez le lapin : communication préliminaire'' in ''Bulletins de l'Académie royale de Belgique. 2me.série ; 40(12)'' 1875

Father

Van Beneden's father, Pierre-Joseph van Beneden (18091894) was also a well-known biologist. He introduced two important terms into evolutionary biology and ecology: mutualism and

commensalism Commensalism is a long-term biological interaction (symbiosis) in which members of one species gain benefits while those of the other species neither benefit nor are harmed. This is in contrast with mutualism, in which both organisms benefit fro ...

.Boucher D.H. 1985. The idea of mutualism, past and future. In D.H. Boucher (ed) ''The biology of mutualism: ecology and evolution''. Oxford University Press. 128

References

Sources

* * *Hamoir, Gabriel. "''La révolution évolutionniste en Belgique: du fixiste Pierre-Joseph Van Beneden à son fils darwiniste Édouard"'', Presses Universitaires de Liège, 2001. Belgian zoologists University of Liège faculty Corresponding members of the Saint Petersburg Academy of Sciences 1846 births 1910 deaths {{Zoologist-stub