Humeral spine
From Infogalactic: the planetary knowledge core
File:Centrolene quindianum02a.jpg
On Centrolene quindianum, the bluish extension in the arm is the humeral spine
Humeral spines are ventrolateral extensions of the humeral crista ventralis.[citation needed] This structures are present in the humerus of some frogs (anurans).[1] The majority of anuran species that present humeral spines are glassfrogs (family Centrolenidae) but humeral spines have been reported in various other species of different families of frogs, including Ceratophryidae and Hylidae.
In all cases, humeral spines are present in males but not in females.[2]
See also
References
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