Nuptial pad

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Secondary sex characteristic on some mature male frogs and salamanders

title: "Nuptial pad" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["amphibian-anatomy", "mating", "sexual-anatomy"] description: "Secondary sex characteristic on some mature male frogs and salamanders" topic_path: "science/biology" source: "https://en.wikipedia.org/wiki/Nuptial_pad" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Secondary sex characteristic on some mature male frogs and salamanders ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/0/0b/NuptialPad.jpg" caption="Nuptial pad (arrow) on thumb of ''[[Pelophylax esculentus]]''"] ::

A nuptial pad (also known as thumb pad, or nuptial excrescence) is a secondary sex characteristic present on some mature male frogs and salamanders. Triggered by androgen hormones, this breeding gland (a type of mucous gland) appears as a spiked epithelial swelling on the forearm and prepollex that aids with grip, which is used primarily by males to grasp (or clasp) females during amplexus. They can also be used in male–male combat in some species.

Historical background

Austrian biologist Paul Kammerer experimented on midwife toads' nuptial pads. He used the offspring's apparent enlargening from generation-to-generation as evidence of Lamarckian evolution.

Examples

Many amphibian species manifest nuptial pads for use in amplexus, an example being the rough-skinned newt, Taricha granulosa.

References

References

  1. William E. Duellman. (1994). "Biology of Amphibians". JHU Press.
  2. (2008-07-25). "Science & Nature – Wildfacts – Common frog, grass frog". BBC.
  3. (1999-10-03). "Mertensiella caucasica". AmphibiaWeb.
  4. (2005-10-26). "Ommatotriton ophryticus". AmphibiaWeb.
  5. (2002-05-25). "Pleurodeles waltl". AmphibiaWeb.
  6. F. Harvey Pough. (2004). "Herpetology". Pearson/Prentice Hall.
  7. Koestler, Arthur. (1971). "The Case of the Midwife Toad". Random House.
  8. [http://home.nycap.rr.com/useless/kammerer ] {{webarchive. link. (September 17, 2008)
  9. C. Michael Hogan. (2008). "Rough-skinned Newt (Taricha granulosa)". Globaltwitcher, ed. Nicklas Stromberg.

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amphibian-anatomymatingsexual-anatomy