Related Experiment Video
Updated: Jun 10, 2026

07:49
Using the Protozoan Paramecium caudatum as a Vehicle for Food-borne Infections in Zebrafish Larvae
Published on: January 7, 2019
August Weismann embraces the protozoa
1History and Philosophy of Science, Indiana University, Bloomington, IN 47405, USA. Churchil@indiana.Edu
Journal of the History of Biology
|July 29, 2010
Summary
August Weismann
Area of Science:
- Evolutionary Biology
- Genetics
- Protozoology
Background:
- August Weismann's 1891 essay 'Amphimixis' is analyzed.
- The essay integrated protozoology research into heredity theory.
- Key contributions from Otto Bütschli and Émile Maupas are highlighted.
Discussion:
- Weismann's work on reduction division and parthenogenesis is contextualized.
- The influence of Émile Maupas's protozoology studies on Weismann's theories is examined.
- The historical development of protozoology's role in heredity theory is reviewed.
Key Insights:
- Protozoa became crucial for heredity theory in the mid-19th century.
- Bütschli and Maupas clarified the relationship between conjugation and fertilization.
- Weismann synthesized these findings to advance evolutionary theory.
Outlook:
- This research offers a deeper understanding of the historical interplay between protozoology and evolutionary genetics.
- It underscores the importance of interdisciplinary research in shaping scientific progress.
- The findings provide context for modern studies on heredity and evolution.
Related Concept Videos
Diversity of Protists IV
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Diversity of Protists I
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Overview of Protists
Protists are diverse eukaryotic microorganisms that lack the specialized tissues of plants and animals and the chitinous cell walls of fungi. Their early divergence within Eukarya resulted in structural, functional, and ecological diversity. They are classified into supergroups such as Archaeplastida, Excavata, Amoebozoa, Rhizaria, Alveolata, and Stramenopiles, determined through genetic analysis and structural similarities.Structural and Functional AdaptationsProtists have various adaptations...
Diversity of Protists II
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
Giardiasis
Giardiasis is a globally prevalent intestinal infection caused by the protozoan parasite Giardia duodenalis (also known as G. lamblia or G. intestinalis). This flagellated protozoan is the most frequently identified intestinal parasite in the United States and worldwide. Transmission primarily occurs via the fecal-oral route, with infection arising from ingestion of water or food contaminated with cysts. Individuals in low-resource settings, international travelers, outdoor enthusiasts, daycare...

