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Fig. 3. Identification of C. elegans pharyngeal neuron types in other
nematodes. (A) The 20 neurons in the C. elegans pharynx. There are 14
neuronal types, 8 of which are single neurons (not shaded), and 6 of which are
bilaterally symmetric left–right pairs (shaded). Paired neurons are more
lateral, whereas single neurons are mostly near the midline, except that M1 is
on the right side and I6 and M5 are on the left side. M1 and I6 are drawn as
one nucleus because they occupy similar positions in the pharynx, even though
they are two distinct neurons (M1 is right, I6 is left). (B–D) Nuclei of
putative homologs of C. elegans pharyngeal neurons in
Pristionchus pacificus PS312 (Diplogasteridae), Cephalobus
sp. DWF1301 (Cephalobidae), and Panagrolaimus sp. PS1159
(Panagrolaimidae). Most C. elegans pharyngeal neurons were readily
identifiable in these other species based on their sizes, shapes and relative
positions on DIC microscopy, except for TB neurons in P. pacificus
(Diplogasteridae), whose relationships to C. elegans TB neurons were
not apparent. Additionally, assignments of homology in the ventral corpus were
often tentative, as indicated by the asterisks, due to differences and
inconsistencies in neuronal characteristics compared to C. elegans.
(Even in C. elegans, positions of neurons in the ventral corpus are
variable in adults, although they are reproducible in young larvae.)
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