urostyle


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Related to urostyle: keel bone

urostyle

a slender, pointed bone at the base of the backbone in amphibians, which is formed from fused vertebrae.
References in periodicals archive ?
The caudal skeleton had 3 epurais, the urostyle, a small uroneural dorsal to the urostyle, 4 hypurals, and 2 autogenous haemal arches on the antepenultimate and penultimate vertebrae.
satan is included within the crown-group (Calyptocephalella + Gigantobatrachus) on the basis of the presence of very well-developed dorsal iliac crest, and short urostyle (Appendix 3).
The following measurements were also included: internarial distance--distance between medial borders of nares; snout length--distance from tip of snout to anterior margin of eye; orbit-jaw distance--shortest distance between deepest region below eye and margin of upper jaw; naris-jaw distance--shortest distance between naris and margin of upper jaw; choana width--maximum width of choana; femur length--distance from tip of urostyle to distal end of femur; arm length--distance from proximal end of radio-ulna to proximal base of pollex; hand length--length from proximal base of pollex to tip of third finger; interfascicular distance--shortest distance between dentigerous fascicles; and tarsal length--distance from proximal border of inner metatarsal tubercle to proximal end of tibiale.
Leap distances were determined by touching upright frogs at the base of the urostyle, and measuring the length of the first leap made in response to the stimulus.
In preservation, two dark, slash-like pigments spots were present on the posterior lateral body above and below the urostyle.