Table 1. Comparison of amphid neurons in various nematode species.

The total number of neurons with dendritic processes encased in the sheath cell in a single amphid compartment is indicated. These neurons are further categorized as neurons with dendrites having single or double ciliated endings in the amphid channel, or as specialized ‘wing’ neurons with endings outside the channel but within the sheath cell other than the finger cell. The ASC neurons in L1 larvae of P. trichosuri described by Zhu et al. (2011) match this criterion but lack the ciliary elaborations known from C. elegans wing neurons.

			Cilia in channel			Wing
Species	Total neurons	Dendritic ends in channel	Total count	Single	Double	Neurons
Pristionchus pacificus	12	11	13	9	2	0
Caenorhabditis elegansa	12	8	10	6	2	3
Haemonchus contortusb	12	10	13	7	3	0
Strongyloides stercoralisc	13	12	12	12	0	0
Parastrongyloides trichosurid	13	11	11	11	0	1?
Acrobeles complexuse	13	12	12	10	1	0

a. Ward et al. (1975).

b. Li et al. (2001).

c. Ashton et al. (1995).

d. Zhu et al. (2011).

e. Bumbarger et al. (2007a) and Bumbarger et al. (2009).