Additionally, all known specimens of K. grebneffi are larger, although small sample size prevents that from being a diagnostic characteristic.

The original publication described little in the way of diagnostic characteristics and was only supported by a few line drawings.

Relief is a diagnostic characteristic of a mineral in plane polarized light that refers to the various ways different minerals "stand out".

Stafford used these diagnostic characteristics when he formally described the species in 1904.

A deep depression on each wing serves as another diagnostic characteristic of the genus.

It comprises 32 diagnostic characteristics, divided into four sub-scales.

The white tips of the wings (primary feathers) seen in flight are another diagnostic characteristic.

But while it is only represented by a partial skeleton, there are enough diagnostic characteristics to provisionally define the genus.

Another diagnostic characteristic is the near-exclusion of the nasals from the external naris.