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length (PL) are used instead). The SVL differs depending on whether the animal is struggling or relaxed (if alive), or various other factors if it is a preserved specimen. For fossils, an
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Because tails are often missing or absent, especially in juveniles, SVL is seen as more invariant than total length. Even in the case of crocodiles, tail tips may be missing.
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Allen E. Greer; Lisa
Wadsworth (September 2003). "Body Shape in Skinks: The Relationship between Relative Hind Limb Length and Relative Snout–Vent Length".
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Various devices are used to position the animal while the measurement is being taken, such as a snake tube, "Mander Masher", or a "Salamander Stick".
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Jessica L. Deichmann; William E. Duellman; G. Bruce
Williamson (June 2008). "Predicting Biomass from Snout–Vent Length in New World Frogs".
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Richard W. Blob (August 1998). "Evaluation of Vent
Position from Lizard Skeletons for Estimation of Snout–Vent Length and Body Mass".
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Kupfer, A. "Sexual size dimorphism in amphibians: an overview". In
Fairbairn, D. J.; Blanckenhorn, W. U.; Székely, T. (eds.).
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such as precaudal length must be used. When combined with weight and body condition, SVL can help deduce age and sex.
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Walston, L. J.; Mullin, S. J. (2005). "Evaluation of a new method for measuring salamanders".
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Wise, S. E.; Buchanan, S. W. (1992). "An efficient method for measuring salamanders".
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Watters, Jessa L.; Cummings, Sean T.; Flanagan, Rachel L.; Siler, Cameron D. (2016).
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63:(vent). It is the most common measurement taken in herpetology, being used for all
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Sex, Size, and Gender Roles: Evolutionary
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Herpetology: An
Introductory Biology of Amphibians and Reptiles
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212:. New York: Oxford University Press. pp. 50–59.
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A female frog being measured for snout vent length.
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414:standards
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138:Zootaxa
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57:snout
422:stub
336:1998
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164:PMID
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
