Félix Joseph Henri de Lacaze-Duthiers (15 May 1821 – 21 July 1901) was a French

biologist A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual Cell (biology), cell, a multicellular organism, or a Community (ecology), community of Biological inter ...

anatomist Anatomy () is the branch of biology concerned with the study of the 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 science, having its ...

and

zoologist 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, animal kingdom, including the anatomy, structure, embryology, evolution, Biological clas ...

born in Montpezat in the department of

Lot-et-Garonne Lot-et-Garonne (, oc, Òlt e Garona) is a department in the Nouvelle-Aquitaine region of Southwestern France. Named after the rivers Lot and Garonne, it had a population of 331,271 in 2019.malacology Malacology is the branch of invertebrate zoology that deals with the study of the Mollusca (mollusks or molluscs), the second-largest phylum of animals in terms of described species after the arthropods. Mollusks include snails and slugs, clams, ...

. He studied medicine in

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

, and worked at

Necker Hospital Necker may refer to: * Necker (surname) * ''Necker'' (ship), several ships * Neckerchief, cloth worn round the neck * Necker cube, optical illusion * Necker Island (Hawaii) * Necker Island (British Virgin Islands) * Necker–Enfants Malades Hospi ...

under

Armand Trousseau Armand Trousseau (14 October 1801 – 23 June 1867) was a French internist. His contributions to medicine include Trousseau sign of malignancy, Trousseau sign of latent tetany, Trousseau–Lallemand bodies (an archaic synonym for Bence Jones ...

(1801–1867). Later on, with

Jules Haime Jules Haime (28 March 1824, Tours – 28 September 1856, Paris) was a French geologist, paleontologist and zoologist known for his research of coral. After studying medicine in Tours, he focused his energies towards natural history. Subsequently, ...

(1824–1856), he travelled to the

Balearic Islands The Balearic Islands ( es, Islas Baleares ; or ca, Illes Balears ) are an archipelago in the Balearic Sea, near the eastern coast of the Iberian Peninsula. The archipelago is an autonomous community and a province of Spain; its capital is ...

to study marine life. In 1854 he returned to Paris as an assistant to

Henri Milne-Edwards Henri Milne-Edwards (23 October 1800 – 29 July 1885) was an eminent French zoologist. Biography Henri Milne-Edwards was the 27th child of William Edwards, an English planter and colonel of the militia in Jamaica and Elisabeth Vaux, a Frenchw ...

(1800–1885), and soon afterwards became a professor of zoology in

Lille Lille ( , ; nl, Rijsel ; pcd, Lile; vls, Rysel) is a city in the northern part of France, in French Flanders. On the river Deûle, near France's border with Belgium, it is the capital of the Hauts-de-France Regions of France, region, the Pref ...

. In 1865 he succeeded

Achille Valenciennes Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist. Valenciennes was born in Paris, and studied under Georges Cuvier. His study of parasitic worms in humans made an important contribution to the study of parasitology. ...

(1794–1865) as chair of ''histoire naturelle des mollusques, des vers et des zoophytes'' at the

National Museum of Natural History, France The French National Museum of Natural History, known in French as the ' (abbreviation MNHN), is the national natural history museum of France and a ' of higher education part of Sorbonne Universities. The main museum, with four galleries, is loc ...

, and in 1868 became a professor at the

University of Paris , image_name = Coat of arms of the University of Paris.svg , image_size = 150px , caption = Coat of Arms , latin_name = Universitas magistrorum et scholarium Parisiensis , motto = ''Hic et ubique terrarum'' (Latin) , mottoeng = Here and a ...

. In 1871 he was elected to

French Academy of Sciences The French Academy of Sciences (French: ''Académie des sciences'') is a learned society, founded in 1666 by Louis XIV of France, Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French Scientific me ...

in the department of anatomy and zoology. Roscoff SBR 06

Lacaze-Duthiers is remembered for his study of the anatomy and developmental history of

mussel Mussel () is the common name used for members of several families of bivalve molluscs, from saltwater and Freshwater bivalve, freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other ...

coral Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and sec ...

snail A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gastro ...

brachiopod Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, w ...

s and other invertebrate marine animals. In 1858 he discovered three

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s in the

Mediterranean The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the e ...

that produced purple-blue dyes. One of the species, named ''

murex trunculus ''Hexaplex trunculus'' (previously known as ''Murex trunculus'', ''Phyllonotus trunculus'', or the banded dye-murex) is a medium-sized sea snail, a marine (ocean), marine gastropod mollusk in the family Muricidae, the murex shells or rock snails ...

'', was the source of the distinctive purple-blue dye used by the ancient

Phoenicia Phoenicia () was an ancient thalassocratic civilization originating in the Levant region of the eastern Mediterranean, primarily located in modern Lebanon. The territory of the Phoenician city-states extended and shrank throughout their histor ...

ns and

Canaan Canaan (; Phoenician: 𐤊𐤍𐤏𐤍 – ; he, כְּנַעַן – , in pausa – ; grc-bib, Χανααν – ;The current scholarly edition of the Greek Old Testament spells the word without any accents, cf. Septuaginta : id est Vetus T ...

ites. He realised the dying process could be used to create a photographic image in purple-blue dye which he named the Mucographé process. Examples are preserved in the Sorbonne and the Royal Society in London. He conducted pioneer exploration of marine life of coastal

Algeria ) , image_map = Algeria (centered orthographic projection).svg , map_caption = , image_map2 = , capital = Algiers , coordinates = , largest_city = capital , relig ...

, that included scientific studies of

. A result of this research was the publication of "''Histoire naturelle du corail''" (1864). He was the founder of two laboratories devoted to

marine biology 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 classifies s ...

; the biological station at

Roscoff Roscoff (; br, Rosko) is a commune in the Finistère département of Brittany in northwestern France. Roscoff is renowned for its picturesque architecture, labelled (small town of character) since 2009. Roscoff is also a traditional departure ...

in 1876, and the Arago laboratory at

Banyuls-sur-Mer Banyuls-sur-Mer (; ) is a commune in the Pyrénées-Orientales department in southern France. It was first settled by Greeks starting in 400 BCE. Geography Location Banyuls-sur-Mer is located in the canton of La Côte Vermeille and in the ar ...

in 1882. A number of species bear his name, a few of them being: ''Strophomenia lacazei'', ''Convoluta lacazi'' and ''Dileptus lacazei''. In 1872 he founded the journal "''Archives de zoologie expérimentale et générale''" (Archives of Experimental and General Zoology).Archive.org
Archives de zoologie expérimentale et générale (1872)

References

* This article incorporates translated text from equivalent articles at the German and French Wikipedia, whose references include: Philippe & Edward R. Jaussaud Brygoo (2004). Museum in the Garden From 516 biographies . National Museum of Natural History in Paris: 630 p.

References

Further reading