Aurivillialepas

Key to the genus Aurivillialepas based on external morphology

(capitulum composed of 14 plates including one subrostrum)

1. Rostrolatus acute, apical angle 60–70°. Peduncle long and narrow............................................... 2

- Rostrolatus obtuse, apical angle approximately 90°. Peduncle quite wide and short.................................. 3

2. Carina continuous with carinal margins of tergum; carina narrow in lateral aspect, not reaching the apex of median latus.................................................................................. A. falcata (Aurivillius, 1898)

- Carina apex free of carinal margin of tergum; carina wide in lateral aspect, reaching the apex of median latus........................................................................................... A. arnaudi (Newman, 1980)

3. Rostrolatus overlapping carinolatus....................................................................... 4

- Rostrolatus separated from carinolatus............................................. A. bocquetae (Newman, 1980)

4. Carina slightly curved, scutum about 1.5 times higher than wide, its apex strongly curved toward tergum................................................................................................ A. rhabdota (Young, 1999)

- Carina curved, scutum high as wide, its apex slightly curved toward tergum............... A. calycula (Aurivillius, 1898)