The anterior end presents a dark purple stain, which is one of the diagnostic characters of this species, and is absent in " Strombus alatus ".
22.
Zhou and Zhang, 2007, reviewed the specimen and concluded that it lacks the diagnostic characters of birds, and that thus may to be a non-avian dinosaur.
23.
Leaves are glossy, often with yellowish to maroon veins on the underside with acarodomatia in the axils-acarodomatia are common in this family and are a useful diagnostic character.
24.
The diagnostic characters are naked parallel-sided axes branching isotomously, terminating in vertically elongate sporangia ( spore-forming organs ) which bear spinous emergences particularly at the distal ends.
25.
The species is also one of two in the genus within North America that lacks the diterpene, a diagnostic character trait that easily separates the species from most others in the genus.
26.
Wright ( 1955 ), found that only the shape of the cone scale and the nature of the shoot indumentum ( any hairy covering or pubescence ) were reliably diagnostic characters separating the 2 species.
27.
The cortex ( outer tissue layer ) of the sclerotium can be used as a diagnostic character to distinguish between " D . racemosa " and small white specimens of " Collybia ".
28.
Designated " Pontogeneus priscus " and " Zeuglodon brachyspondylus " to be " nomina dubia " based on the lack of diagnostic characters that distinguish the type specimens from other basilosaurids.
29.
A diagnostic character of the genus " Triaeris " is the long patella; the patella of the first leg of " T . stenaspis " is almost as long as the tibia.
30.
Ornithologists James Hancock and Jim Kushlan also consider the two to be a single species, with the differences in plumage, size, skin coloration and degree of bill darkening during breeding season forming the diagnostic characters.
