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Table 1 Classification of the sensory and motor ciliated cell types of Paralvinella hessleri

From: Sensing deep extreme environments: the receptor cell types, brain centers, and multi-layer neural packaging of hydrothermal vent endemic worms

Cell types

Body localities

Projections in CNS

Specific characters ciliary length/width

Possible homologies

Sensilla type

branchial crown

anterior VNC

chemical sensory cells

penetrative sensory cells

 

whole bodies

VNC, each segment

chemical sensory cells 1-12/0.3μm

 

Line type

dorsal prostomium

anterior VNC

forming lines on the dorsal head 4-13/0.2μm

neck ciliary bands?

Tuft type

whole prostomium

brain, MB

round and short cilia 1-3/0.2μm

penetrative sensory cells

Bud type

ventral area of notopods

VNC

roughly lined with pods 1-21/0.1-0.2μm(sharp)

olfactory organ-like

Patch type

lateral branch and whole bodies

-

typical motor cilia 1-12/0.2μm

motor ciliary cells

Ventral patch type

ventral abdomen

-

ventrally localized 1-11/0.2μm

sensory receptor cells?

lateral organs

  1. Possible homologies are based on Purschke [38]. MB, Mushroom body; VNC, Ventral nerve cord.