Phalangeal Proportions
Definition
The relative lengths and widths of the digit bones (phalanges). Used in bear paw identification, where species-specific phalangeal index ratios and claw curvature separate Asiatic black bear from other bear species and from domestic pig feet (a documented substitution in trade).
- Application
- Bear paw species identification in wildlife trade cases
- Measures used
- Digit bone length and width ratios, claw curvature
- Distinguishes
- Asiatic black bear from other bear species and pig feet
- Field
- Wildlife forensics
Common questions
Why is distinguishing bear paws from pig feet forensically relevant?+
Pig feet have been documented as a substitute passed off as bear paw in illegal wildlife trade, so a reliable skeletal method to tell them apart lets investigators confirm or refute a trafficking charge from seized or processed remains.
Are phalangeal proportions used alone or with other traits for species identification?+
They are typically combined with other skeletal or morphological features, and where tissue condition allows, DNA species testing provides an independent confirmation alongside the osteometric comparison.
Related terms
- Articular Surface
- The smooth cartilage-covered end of a long bone that forms a joint. Shape, curvature, and proportional dimensions of articular surfaces are primary...
- Avian Pneumatic Bone
- Bone in birds that is internally hollow or has air sac connections, substantially reducing skeletal mass for flight. The thin cortex and...
- Cortical Bone Histology
- Examination of thin sections of compact bone under transmitted and polarised light microscopy to characterise osteon structure, lamellation, and vascularisation pattern. Used...
- Osteometric Discriminant Analysis
- Multivariate statistical classification of an unidentified bone specimen based on a set of standardised measurements, using reference data from known-species museum collections...
- Osteon (Haversian System)
- The basic structural unit of compact cortical bone: a central Haversian canal surrounded by concentric lamellae of mineralised collagen. Osteon diameter and...