1.   The adoral shields are slightly wing-like, not or just separating the oral shield from the first lateral arm plate.

2.   The adoral shields are small wing-like almost separating the oral shield from the first lateral arm plate.

3.   The distal ventral arm plates are more pentagonal with an obtuse proximal angle and a wide convex distal edge.

4.   The dorsal arm plates are bell shaped or triangular with a convex distal edge and are separated.

5.   The dorsal arm plates are bell shaped sometimes with a distinct lobe on the distal edge, and contiguous.

6.   The dorsal arm plates are bell shaped, the proximal ones contiguous.

7.   The dorsal arm plates are fan shaped and separated.

8.   The dorsal arm plates are fan shaped to rounded triangular and contiguous proximally.

9.   The dorsal arm plates are fan shaped with an acute proximal angle and separated.

10.   The dorsal arm plates are fan shaped, contiguous proximal, but well separated distally.