claws, epidermal horny sheath, and ungual phalanx

(Updating this request upon further discussion).

Currently we don't really have a "claw" class. We do have 'toilet claw' as a subclass of nail, and keratinous claw in ext from AAO (which probably needs both a different superclass as well as a logical def).

Some suggestions:

name: claw
synonym: epidermal horny sheath
subclass of 'distal limb integumentary appendage' (e.g. sibling to nail and hoof)

Note we have specific claw terms such as toilet claw and keratinous claw, the latter is in ext from AAO and should be moved and better defined logically wrt composition.

see: Evolution and development of mammalian limb integumentary structures: Adaptive evolution of nails, hooves and claws. Hamrick 2001, Evolution and Development 3:5 p. 355

Nail should has_part 'nail plate', which distinguishes it from a claw.

name: ungual phalanx
equivalent to: distal phalanx and (has_quality some ?)
What would the pato term be here? what makes something claw-like?

See: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2736125/
Needs further discussion.

Review the existing “toilet claw” term and the AAO-derived “keratinous claw” term before proposing the hierarchy. Resolve the requested definitions for claw, nail, hoof, and ungual phalanx, including the nail-plate distinction and the claw-like quality, through the further discussion the issue says is needed. Done means the ontology model and logical definitions are agreed.