Miniaturization of Body Size: Organismal Consequences and Evolutionary Significance
Abstract
Miniaturization, or the evolution of extremely small adult body size, is a widespread phenomenon in animals. It has important consequences for both organismal biology and phyletic diversification above the species level. The miniaturized phenotype is a complex combination of ancestral and derived traits, including reduction and structural simplification, increased variability, and morphological novelty. Many features likely represent secondary consequences of size decrease, which may be the result of selection primarily for small body size or some related attribute such as life history characteristics. In some cases, miniaturization has resulted in novel bauplans associated with the origin of higher taxa. Evaluation of causes and consequences of miniaturization should consider obvious feattires of physical size as well as less obvious, but biologically important, features such as genome and cell size.
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Progenesis is an evolutionary process that speeds up gonad development in relation to somatic development, so that the result is a small organism with larval features yet ripe gonads.
“Progenesis is an evolutionary process that speeds up gonad development in relation to somatic development, so that the result is a small organism with larval features yet ripe gonads1,2.”
From The emerging vertebrate model species for neurophysiological studies is Danionella cerebrum, new species (Teleostei: Cyprinidae) (2021) · cites this paper as [2]
Miniaturization is widespread among vertebrates.
“Miniaturization is widespread among vertebrates, yet its genomic basis remains poorly understood.”
From Convergent genome streamlining accompanies independent miniaturization in the world’s smallest fishes (2026) · cites this paper as [1]
Extreme body-size reduction is thought to facilitate exploitation of structurally complex, resource-limited or unstable environments and is often accompanied by fast life histories, consistent with selection for rapid development.
“Extreme body-size reduction is thought to facilitate exploitation of structurally complex, resource-limited or unstable environments (1) and is often accompanied by fast life histories, consistent with selection for rapid development.”
From Convergent genome streamlining accompanies independent miniaturization in the world’s smallest fishes (2026) · cites this paper as [1]
Miniaturization is a recurrent theme across animal diversity, having evolved independently across numerous invertebrate and vertebrate lineages.
“Miniaturization, the reduction of adult body size to an extreme degree, is a recurrent theme across animal diversity, having evolved independently across numerous invertebrate and vertebrate lineages (1).”
From Convergent genome streamlining accompanies independent miniaturization in the world’s smallest fishes (2026) · cites this paper as [1]
The unidirectionality of transitions is most readily explained for progenetic miniaturization, which involves profound and largely irreversible developmental truncation.
“This unidirectionality is most readily explained for progenetic miniaturization, which involves profound and largely irreversible developmental truncation (1, 5, 14).”
From Convergent genome streamlining accompanies independent miniaturization in the world’s smallest fishes (2026) · cites this paper as [1]
Cites
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A critical reappraisal of the fossil record of the bilaterian phyla
BUDD, G. E., & JENSEN, S. (2000) · Biological Reviews of the Cambridge Philosophical Society · doi:10.1017/s000632310000548x · Cited by 428 · see citing works
Sustained miniaturization and anatomical innovation in the dinosaurian ancestors of birds
Lee, M. S. Y., Cau, A., Naish, D., & Dyke, G. J. (2014) · Science · doi:10.1126/science.1252243 · Cited by 257 · see citing works
A critical reappraisal of the fossil record of the bilaterian phyla
BUDD, G. E., & JENSEN, S. (2000) · Biological Reviews · doi:10.1111/j.1469-185x.1999.tb00046.x · Cited by 145 · see citing works
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- Authors
- Hanken, J., & Wake, D. B.
- Venue
- Annual Review of Ecology and Systematics
- Publisher
- Annual Reviews
- Published
- 1993-11
- Volume
- 24
- Issue
- 1
- Pages
- 501-519
- ISSN
- 0066-4162 (ISSN-L)
- OpenAlex
- W2174979248
- Cited by
- 533
- References
- 1
- Citations by year
- 2026: 15 · 2025: 31 · 2024: 34 · 2023: 22 · 2022: 31 · 2021: 40 · 2020: 29 · 2019: 34 · 2018: 25 · 2017: 20 · 2016: 13 · 2015: 21 · 2014: 17 · 2013: 21 · 2012: 20
- FWCI
- 6.68
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Annual Review of Ecology and Systematics (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
- Physical Sciences › Mathematics › Geometry and Topology › Morphological variations and asymmetry
- Keywords
- miniaturization, body size evolution, small body size, morphological simplification, morphological novelty, life-history traits, bauplan, genome size, cell size, structural reduction
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