Acarnus, Gray, 1867

publication ID	https://doi.org/ 10.11646/zootaxa.5523.4.1
publication LSID	lsid:zoobank.org:pub:27C5E1BE-6443-463E-A75A-154D099A2762
DOI	https://doi.org/10.5281/zenodo.13973532
persistent identifier	https://treatment.plazi.org/id/503687B6-245B-8369-FF5E-FC9E7FACF092
treatment provided by	Plazi
scientific name	Acarnus
status

Identification key for the Western Atlantic species of Acarnus View in CoL

(Details of spicule set in Table 4 View TABLE 4 )

1a. Three types of megascleres............................................................................. 2

1b. Four or more types of megascleres........................................................................ 3

2a. Megascleres as styles, tylotes, cladotylotes................................................................. 5

2b. Megascleres as tylotes, cladotylotes I and acanthostyles.............................................. A. radovani

3a. Megascleres as styles, tylotes, cladotylotes and acanthostyles.................................................. 4

3b. Megascleres as styles, tylotes, cladotylotes and tylostyles................................ Acarnus tupiniquim sp. nov.

4a. Two categories of cladotylotes.......................................................................... 6

4b. A single category of cladotylotes................................................................. A. souriei

5a. Cladotylotes I spined.................................................................................. 7

5b. Cladotylotes I smooth...................................................................... A. innominatus

6a. Two types of microscleres (toxas and chelae)............................................................... 8

6b. Three types of microscleres (toxas, chelae and microxeas).......................................... A. microxeatus

7a. Two categories of toxas................................................................................ 9

7b. Three categories of toxas........................................................................ A. toxeata

8a. Palmate isochelae <21µm (14.4–21µm)........................................................... A. nicoleae

8b. Palmate isochelae> 21µm (29.2–39.9µm).............................................. Acarnus hooperi sp. nov.

9a. Toxas I (accolada) and II (deeply-curved) present..................................................... A. tortilis

9b. Toxas II (deeply-curved) and III (oxhorn) present.................................................. A. deweerdtae