Untersuchungen über Gastrulation and Embryobildung bei den Chordaten, von Fr. Kopsch. I. Die morphologische Bedeutung des Keimhautrandes und die Embryobildung bei der Forelle. Mit 10 lithographischen Tafeln und 18 Abbildungen im Text.

Kopsch, Friedrich

doi:10.5962/bhl.title.8216

Cited by 13 publications

(7 citation statements)

References 7 publications

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“…As in ascidians it arises in the outer layer of the dorsal lip and extends back as far as the blastopore, but whether its cells arise in close connection with the chorda and from both dorsal and ventral hemispheres as in the ascidians is unknown; furthermore, the distance of the anterior edge of the plate from the animal pole is unknown. The work of Kopsch (1900) indicates that in the frog the anterior margin of the plate is situated less than half the distance from the equator to the animal pole, and H. V. Wilson (1000) in particular has shown that the anterior part of the neural plate is formed from the black hemisphere, the posterior part from the white hemisphere. a result which agrees precisely with my observations on ascidians.…”

mentioning

confidence: 99%

The organization and cell-lineage of the ascidian egg / by Edwin G. Conklin.

Conklin¹

1905

290

438

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confidence: 99%

The organization and cell-lineage of the ascidian egg / by Edwin G. Conklin.

Conklin¹

1905

290

438

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“…This mechanism is reminiscent of Serres' view that the left and right halves of the body have separate developmental origins (Section 5.6 ). Concrescence was found also in some “invertebrates” (reviewed by Kopsch, 1904 ).…”

Section: Mechanismsmentioning

confidence: 97%

“…Rabl described concrescence as “one of the most important developmental theories about the structure of the vertebrate body…” (Rabl, 1897 , p. xii); and even Kopsch, who was skeptical about concrescence, argued that: “the epoch–making significance of His's concept consists in the extraordinarily simple way in which the embryonic development of vertebrates and invertebrates can now be explained by the same processes” (Kopsch, 1904 , p. 4). Unfortunately, subsequent cell‐marking studies were not consistent with concrescence and the theory fell out of favor (Richardson & Keuck, 2021 ).…”

Section: Mechanismsmentioning

confidence: 99%

Theories, laws, and models in evo‐devo

Richardson

2021

J Exp Zool Pt B

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Evolutionary developmental biology (evo‐devo) is the study of the evolution of developmental mechanisms. Here, I review some of the theories, models, and laws in evo‐devo, past and present. Nineteenth‐century evo‐devo was dominated by recapitulation theory and archetypes. It also gave us germ layer theory, the vertebral theory of the skull, floral organs as modified leaves, and the “inverted invertebrate” theory, among others. Newer theories and models include the frameshift theory, the genetic toolkit for development, the ABC model of flower development, the developmental hourglass, the zootype, Urbilateria, and the hox code. Some of these new theories show the influence of archetypes and recapitulation. Interestingly, recent studies support the old “primordial leaf,” “inverted invertebrate,” and “segmented head” theories. Furthermore, von Baer's first three laws may now need to be rehabilitated, and the hourglass model modified, in view of what Abzhanov has pointed out about the maternal‐zygotic transition. There are many supposed “laws” of evo‐devo but I argue that these are merely generalizations about trends in particular lineages. I argue that the “body plan” is an archetype, and is often used in such a way that it lacks any scientific meaning. Looking to the future, one challenge for evo‐devo will be to develop new theories and models to accommodate the wealth of new data from high‐throughput sequencing, including single‐cell sequencing. One step in this direction is the use of sophisticated in silico analyses, as in the “transcriptomic hourglass” models.

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“…This process of fusion supposedly takes place during epiboly, and became known as ‘concrescence’ (Fig. 9 ; reviewed by Kopsch, 1904 ). In one thought experiment, His imagined concrescence as if a ring of rubber tubing were pushed inwards at one point; the resulting two‐layered indentation represents the nascent embryo and the converging halves of the germ ring (His, 1877b , p. 109, n.).…”

Section: ‘Our Bodily Form’ ( Unsere Körperform ...mentioning

confidence: 99%

The revolutionary developmental biology ofWilhelmHis,Sr.

Richardson

Keuck²

2022

Biological Reviews

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Swiss-born embryologist Wilhelm His, Sr. was the first scientist to study embryos using paraffin histology, serial sectioning and three-dimensional modelling. With these techniques, His made many important discoveries in vertebrate embryology and developmental neurobiology, earning him two Nobel Prize nominations. He also developed several theories of mechanical and evolutionary developmental biology. His argued that adult form is determined by the differential growth of developmental primordia. Furthermore, he suggested that changes in the growth parameters of those primordia are responsible for generating new phenotypes during evolution. His developed these theories in his book 'Our Bodily Form' (Unsere Körperform). Here, we review His's work with special emphasis on its potential importance to the disciplines of evolutionary developmental biology (evo-devo) and mechanobiology.

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Untersuchungen über Gastrulation and Embryobildung bei den Chordaten, von Fr. Kopsch. I. Die morphologische Bedeutung des Keimhautrandes und die Embryobildung bei der Forelle. Mit 10 lithographischen Tafeln und 18 Abbildungen im Text.

Cited by 13 publications

References 7 publications

The organization and cell-lineage of the ascidian egg / by Edwin G. Conklin.

The organization and cell-lineage of the ascidian egg / by Edwin G. Conklin.

Theories, laws, and models in evo‐devo

The revolutionary developmental biology ofWilhelmHis,Sr.

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