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Table 1 Character state of variable traits in the naidid nervous sytem

From: Fine taxonomic sampling of nervous systems within Naididae (Annelida: Clitellata) reveals evolutionary lability and revised homologies of annelid neural components

 

Species

Tubifex tubifex

Pristina aequiseta

Pristina leidyi

Monopyleporus rubroniveus

Dero digitata

Dero furcata

Allonais paraguayensis

Paranais litoralis

Amphichaeta sp.

Chaetogaster diaphanus

Nais stolci

Stylaria lacustris

 

Subfamily

T

P

P

R

N

N

N

N

N

N

N

N

Traits

             

Anterior nervous system

brain, anterior edge

pr

pr

pr

s1

pe

pr/pe

pe

s1

pr

s1

pr/pe

pr/pe

brain, posterior edge

pe/s1

pe/s1

pe/s1

s2

s1

s1

s1

s2

pe

s1

s1

pe/s1

#brain SIR cells

2/6

2

2

2

4

4/6

2

10

2

0

8

4

#ciliary sense organs

1

2

2

0*

2

2

2

2

2

4/6

2

2

position ciliary sense organs

br

br

br

NA*

br

br

br

pr

pr

br/pr

br

br

prostomium shape

cone

prob.

prob.

blunt

cone

cone

cone

blunt

cone

lips

cone

prob.

eyes

no

no

no

no

no

no

no

no

no

no

yes

yes

Ventral nerve cord ganglia

#parachaetal

0-3

0-2

1-2

1-4

1-4

3-4

2-6

1

2

1-2

1-2

1-2

#axillar

0-2

1

1

1(2)

1

1

1-2

1-2

1

1

1

1

#central

0-1

0-2

1-3

1-2

1-3

2

1-2

0-2

0

1-2

1-2

1-2

#rear

0-many

0-1

0-1

1-2

1

1

1

1

1

1

1

1

#segments with ant. SIR pattern

3

4

4

4

4

4

4

4

4

3

4

4

#medullary ant. segments

4

4

4

?

5

4

5

3

2

2

3 + 2

4

first septum

2/3

2/3

2/3

3/4

3/4

3/4

3/4

3/4

2/3

3, 4/5

3/4

3/4

ganglion type

non-sept

sept

sept

non-sept*

non-sept

sept

non-sept

sept

non-sept

non-sept

sept

non-sept

PNS

#seg. nerves

4

4

4

4*

4

4

4

4

4

5

4

4

#segments with ant. PNS

2

4

4

0

4

4

4

1

2

4

4

2

  1. Summary of main nervous system traits found to be variable across the twelve species of Naididae presented in this study. Character states with an asterisk (*) are based on observations of poor quality images and should not be considered as confirmed. See Main Text and Additional file 19 for explanation of traits. Abbreviations by row: Subfamily - T: Tubificinae; P: Pristininae; R: Rhyacodrilinae; N: Naidinae; brain - pr: prostomium, pe: peristomium, s1: chaetigerous segment 1; s2: chaetigerous segment 2; x/y: boundary between x and y; prostomium shape - prob: proboscis; ganglion type – non-sep: non-septate, sep: septate.
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Frontiers in Zoology

ISSN: 1742-9994