Berthold Hatschek

Berthold Hatschek (3 April 1854 – 18 January 1941) was an Austrian zoologist remembered for embryological and morphological studies of invertebrates.

Berthold Hatschek

He studied zoology in Vienna under Carl Claus (1835-1899), and in Leipzig with Rudolf Leuckart (1822-1898). He gained his doctorate at the University of Leipzig with a dissertation titled Beiträge zur Entwicklungsgeschichte der Lepidopteren. Hatschek was deeply influenced by the works of Ernst Haeckel (1834-1919).

In 1885 he was appointed professor of zoology at Charles University in Prague, and from 1896 was a professor and director of the second zoological institute at the University of Vienna. Hatschek suffered from severe depression, which greatly affected his work in the latter stages of his life.[1][2]

Hatschek is remembered for the so-called "trochophore theory", in which he explains the trochophore to be the larval form of a hypothetical organism- the "trochozoon" (which in adult form corresponded to a trochophore-like rotifer, and was the suggested common ancestor of almost all bilateral, metazoan lifeforms).[3][4]

In 1888 he split Frey and Leuckart's Coelenterata into three phyla: Spongiaria, Cnidaria and Ctenophora.[5][6] From his research of amphioxus, the anatomical terms- "Hatschek's pit" and "Hatschek's nephridium" are derived.[7]

Selected writings

  • Studien über Entwicklungsgeschichte der Anneliden. Ein Beitrag zur Morphologie der Bilaterien, 1878.
  • Studien über entwicklung des Amphioxus, 1881.
  • Lehrbuch der Zoologie : eine morphologische Übersicht des Thierreiches zur Einführung in das Studium dieser Wissenschaft, 1888.
  • "The Amphioxus and its development", translated into English, 1893.
  • Das acromerit des Amphioxus, 1906.
  • Das neue Zoologische System, 1911.[8]
gollark: It's not a huge obstacle if we just upscale humans to the size of galaxies or something.
gollark: Probably more.
gollark: I think that's probably around a solar system worth of mass.
gollark: If you do all 1024-long nucleotide sequences, you will need at least 32317006071311007300714876688669951960444102669715484032130345427524655138867890893197201411522913463688717960921898019494119559150490921095088152386448283120630877367300996091750197750389652106796057638384067568276792218642619756161838094338476170470581645852036305042887575891541065808607552399123930385521914333389668342420684974786564569494856176035326322058077805659331026192708460314150258592864177116725943603718461857357598351152301645904403697613233287231227125684710820209725157101726931323469678542580656697935045997268352998638215525166389437335543602135433229604645318478604952148193555853611059596230656 mRNA things.
gollark: FEAR cyanobacteria.

References

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