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Body size miniaturization in a lineage of colubrid snakes : implications for cranial anatomy

(2021) JOURNAL OF ANATOMY. 238(1). p.131-145
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Abstract
As body size strongly determines the biology of an organism at all levels, it can be expected that miniaturization comes with substantial structural and functional constraints. Dwarf snakes of the genus Eirenis are derived from big, surface‐dwelling ancestors, considered to be similar to those of the sister genus Dolichophis. To better understand the structural implications of miniaturization on the feeding apparatus in Eirenis, the morphology of the cranial musculoskeletal system of Dolichophis schmidti was compared with that of the miniature Eirenis punctatolineatus and E. persicus using high‐resolution µCT data. The gape index was compared between D. schmidti and 14 Eirenis species. Our results show a relatively increased neurocranium size and decreased maximal jaw muscle force in E. persicus, compared with the D. schmidti, and an intermediate situation in E. punctatolineatus. A significant negative allometry in gape index relative to body size is observed across the transition from the Dolichophis to Pediophis and Eirenis subgenera. However, the gape index relative to head size showed a significant negative allometry only across the transition from the Dolichophis to Pseudocyclophis subgenus. In Dolichophis–Eirenis dwarfing lineages, different structural patterns are observed through miniaturization, indicating that overcoming the challenge of miniaturization has achieved via different adaptations.
Keywords
Dolichophis, Eirenis, miniaturization, morphology, myology, osteology, BITE-FORCE, BRAIN SIZE, ANNOTATED CHECKLIST, FEEDING APPARATUS, ONTOGENIC CHANGES, NERODIA-FASCIATA, GENUS EIRENIS, WATER SNAKES, HEAD SHAPE, GAPE SIZE

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Citation

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MLA
Rajabizadeh, Mahdi, et al. “Body Size Miniaturization in a Lineage of Colubrid Snakes : Implications for Cranial Anatomy.” JOURNAL OF ANATOMY, vol. 238, no. 1, 2021, pp. 131–45, doi:10.1111/joa.13293.
APA
Rajabizadeh, M., Adriaens, D., De Kegel, B., Avci, A., Ilgaz, C., & Herrel, A. (2021). Body size miniaturization in a lineage of colubrid snakes : implications for cranial anatomy. JOURNAL OF ANATOMY, 238(1), 131–145. https://doi.org/10.1111/joa.13293
Chicago author-date
Rajabizadeh, Mahdi, Dominique Adriaens, Barbara De Kegel, Aziz Avci, Cetin Ilgaz, and Anthony Herrel. 2021. “Body Size Miniaturization in a Lineage of Colubrid Snakes : Implications for Cranial Anatomy.” JOURNAL OF ANATOMY 238 (1): 131–45. https://doi.org/10.1111/joa.13293.
Chicago author-date (all authors)
Rajabizadeh, Mahdi, Dominique Adriaens, Barbara De Kegel, Aziz Avci, Cetin Ilgaz, and Anthony Herrel. 2021. “Body Size Miniaturization in a Lineage of Colubrid Snakes : Implications for Cranial Anatomy.” JOURNAL OF ANATOMY 238 (1): 131–145. doi:10.1111/joa.13293.
Vancouver
1.
Rajabizadeh M, Adriaens D, De Kegel B, Avci A, Ilgaz C, Herrel A. Body size miniaturization in a lineage of colubrid snakes : implications for cranial anatomy. JOURNAL OF ANATOMY. 2021;238(1):131–45.
IEEE
[1]
M. Rajabizadeh, D. Adriaens, B. De Kegel, A. Avci, C. Ilgaz, and A. Herrel, “Body size miniaturization in a lineage of colubrid snakes : implications for cranial anatomy,” JOURNAL OF ANATOMY, vol. 238, no. 1, pp. 131–145, 2021.
@article{8679875,
  abstract     = {{As body size strongly determines the biology of an organism at all levels, it can be expected that miniaturization comes with substantial structural and functional constraints. Dwarf snakes of the genus Eirenis are derived from big, surface‐dwelling ancestors, considered to be similar to those of the sister genus Dolichophis. To better understand the structural implications of miniaturization on the feeding apparatus in Eirenis, the morphology of the cranial musculoskeletal system of Dolichophis schmidti was compared with that of the miniature Eirenis punctatolineatus and E. persicus using high‐resolution µCT data. The gape index was compared between D. schmidti and 14 Eirenis species. Our results show a relatively increased neurocranium size and decreased maximal jaw muscle force in E. persicus, compared with the D. schmidti, and an intermediate situation in E. punctatolineatus. A significant negative allometry in gape index relative to body size is observed across the transition from the Dolichophis to Pediophis and Eirenis subgenera. However, the gape index relative to head size showed a significant negative allometry only across the transition from the Dolichophis to Pseudocyclophis subgenus. In Dolichophis–Eirenis dwarfing lineages, different structural patterns are observed through miniaturization, indicating that overcoming the challenge of miniaturization has achieved via different adaptations.}},
  author       = {{Rajabizadeh, Mahdi and Adriaens, Dominique and De Kegel, Barbara and Avci, Aziz and Ilgaz, Cetin and Herrel, Anthony}},
  issn         = {{0021-8782}},
  journal      = {{JOURNAL OF ANATOMY}},
  keywords     = {{Dolichophis,Eirenis,miniaturization,morphology,myology,osteology,BITE-FORCE,BRAIN SIZE,ANNOTATED CHECKLIST,FEEDING APPARATUS,ONTOGENIC CHANGES,NERODIA-FASCIATA,GENUS EIRENIS,WATER SNAKES,HEAD SHAPE,GAPE SIZE}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{131--145}},
  title        = {{Body size miniaturization in a lineage of colubrid snakes : implications for cranial anatomy}},
  url          = {{http://dx.doi.org/10.1111/joa.13293}},
  volume       = {{238}},
  year         = {{2021}},
}

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