Identification key for Atlantic Acarnus spp

1- Acanthostyles present.................................................................................. 2

- Acanthostyles absent.................................................................................. 6

2- Acanthoxeas present................................................................. A. microxeatus sp. nov.

- Acanthoxeas absent................................................................................... 3

3- Only a single category of cladotylotes present............................................................... 4

- Two categories of cladotylotes present..................................................................... 5

4- Only a single category of acanthostyles present...................................................... A. radovani

- Two categories of acanthostyles present............................................................ A. souriei

5- Two categories of toxas........................................................................... A. levii

- Three categories of toxas....................................................................... A. nicoleae

6- Styles with a smooth base; larger cladotylotes with a smooth shaft................................... A. innominatus

- Styles with microspined or rugose base; two categories of microspined cladotylotes................................. 7

7- Two categories of cladotylotes........................................................................... 8

- Three categories of cladotylotes............................................................... A. deweerdtae

8- Three categories of toxas............................................................................... 9

- Two categories of toxas......................................................................... A. tortillis

9- Cladotylotes I with basal tyle flattened and provided with lobes and blunt protrusions........................ A. claudei

- Cladotylotes I with basal tyle bearing curved spines................................................... A. toxeata