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Embryo drawing is the illustration of embryos in their developmental sequence. In plants and animals, an embryo develops from a zygote, the single cell that results when an egg and sperm fuse during fertilization. In animals, the zygote divides repeatedly to form a ball of cells, which then forms a set of tissue layers that migrate and fold to form an early embryo. Images of embryos provide a means of comparing embryos of different ages, and species. To this day, embryo drawings are made in undergraduate developmental biology lessons.
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (ontogeny), goes through stages resembling or representing successive adult stages in the evolution of the animal's remote ancestors (phylogeny). It was formulated in the 1820s by Étienne Serres based on the work of Johann Friedrich Meckel, after whom it is also known as Meckel–Serres law.
Nekton or necton refers to the aggregate of actively swimming aquatic organisms in a body of water. The term was proposed by German biologist Ernst Haeckel to differentiate between the active swimmers in a body of water, and the passive organisms that were carried along by the current, the plankton. As a guideline, nektonic organisms have a high Reynolds number and planktonic organisms a low one. However, some organisms can begin life as plankton and transition to nekton later on in life, sometimes making distinction difficult when attempting to classify certain plankton-to-nekton species as one or the other. For this reason, some biologists choose not to use this term.
Phronema is a transliteration of the Greek word φρόνημα, which has the meanings of "mind", "spirit", "thought", "purpose", "will", and can have either a positive meaning or a bad sense.
Karl Gegenbaur was a German anatomist and professor who demonstrated that the field of comparative anatomy offers important evidence supporting of the theory of evolution. As a professor of anatomy at the University of Jena (1855–1873) and at the University of Heidelberg (1873–1903), Karl Gegenbaur was a strong supporter of Charles Darwin's theory of organic evolution, having taught and worked, beginning in 1858, with Ernst Haeckel, 8 years his junior.
Morphology is a branch of biology dealing with the study of the form and structure of organisms and their specific structural features.
"Haeckel's Tale" is the twelfth episode of the first season of the television series Masters of Horror. It originally aired in North America on January 27, 2006. George A. Romero was originally supposed to direct the episode but was replaced by John McNaughton because of a scheduling problem.
Kunstformen der Natur is a book of lithographic and halftone prints by German biologist Ernst Haeckel.
Ontogeny and Phylogeny is a 1977 book on evolution by Stephen Jay Gould, in which the author explores the relationship between embryonic development (ontogeny) and biological evolution (phylogeny). Unlike his many popular books of essays, it was a technical book, and over the following decades it was influential in stimulating research into heterochrony, changes in the timing of embryonic development, which had been neglected since Ernst Haeckel's theory that ontogeny recapitulates phylogeny had been largely discredited.
The term "world riddle" or "world-riddle" has been associated, for over 100 years, with Friedrich Nietzsche
and with the biologist-philosopher Ernst Haeckel, who, as a professor of zoology at the University of Jena,
wrote the book Die Welträthsel in 1895–1899, in modern spelling Die Welträtsel, with the English version published under the title The Riddle of the Universe, 1901.
Hackl is a German surname. Notable people with the surname include:
Ornithurae is a natural group which includes the common ancestor of Ichthyornis, Hesperornis, and all modern birds as well as all other descendants of that common ancestor.
Narcomedusae is an order of hydrozoans in the subclass Trachylinae. Members of this order do not normally have a polyp stage. The medusa has a dome-shaped bell with thin sides. The tentacles are attached above the lobed margin of the bell with usually a gastric pouch above each. There are no bulbs on the tentacles and no radial canals. Narcomedusans are mostly inhabitants of the open sea and deep waters. They can be found in the Mediterranean in large numbers.
Hackel is the surname of several people:
Cychropsis is a genus of beetles in the family Carabidae, containing the following species:
Heinrich Schmidt was a German archivist, naturalist, philosopher professor and a disciple of Ernst Haeckel.
Daniel E. Gasman was an American historian at John Jay College and the Graduate Center at City University of New York. He earned his PhD from University of Chicago in modern intellectual history. His most famous book is The Scientific Origins of National Socialism, which has been both praised and criticized by scholars. His second book, Haeckel’'s Monism and the Birth of Fascist Ideology, has been reviewed in journals.
Trichogypsiidae is a family of sponges in the class Calcarea.
