Table 2 Nervous system character matrix including published data. Character states used in this matrix: present (1), absent (0) and missing data (?)

 brain

1

1

1

1

1

1

 circumoral nerve ring

1

1

1

1

1

1

 outer nerve ring

1

?

?

?

0

1

 trifid nerve

1

1

1

?

1

1

  descending branch

?

?

1

?

?

?

  annular branch

1

?

1

?

?

?

  visceral branch

1

?

?

?

0

1

 direct nerve origin sites

?

1

1

?

?

?

 direct tentacle sheath nerve

1

1

1

?

1

1

 radial nerves

1

?

?

1

1

1

 abfrontal tentacle nerve

1

?

?

1

1

1

 mediofrontal tentacle rootlets

1

?

?

?

1

1

 mediofrontal tentacle nerve

1

?

?

1

1

1

 laterofrontal tentacle nerve

1

?

?

1

1

1

 intertentacular pits

1

?

1

1

?

1

 intertentacular neurites

1

?

?

?

?

?

 mediovisceral nerve

1

?

?

?

1

1

  (pharyngeal) laterovisceral nerves

1

?

?

?

1

1

  (pharyngeal) medio-laterovisceral nerve

1

?

?

?

?

1

 pharyngeal plexus

1

?

?

?

1

1

 visceral ganglion

?

?

?

?

?

?

 compound tentacle sheath nerve

?

?

1

?

?

?

 parietal branching site

?

?

1

?

?

?

 parietal muscle nerve

?

?

?

?

1

?

 parietovestibular branch

0

0

0

0

0

0

 sphincter branch

?

?

1

?

?

?

 parietodiaphragmatic nerve

?

?

?

?

?

?

 interzooidal pores

?

?

?

?

?

?

1

present

0

absent

?

missing data